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[@GauravSuthar]

Next Video kis Chapter ki chahiye Comments me btaao jaldi 👇👇

[@BLACKEDITz000]

Bhaiya please electricity ki video pls 🙏🏻

[@amruddinkhan7100]

Life processes

[@Unique_thakur_ji]

Sabhi chapters ke

[@amruddinkhan7100]

Please

[@royal_challengers_58]

Magnetic Effect Of Electric Current Plzzz Kal Tak Upload krdo mera pre board hai parso plzzzzzz

[@Mr_lucifer_4u]

Vote for all chapters m imp pyq's ❤❤😊 ⬇️⬇️⬇️

[@JaspalSingh-dv1hs]

answer 1- Aluminium is a very reactive metal and cannot exist in free state like gold (Au) and silver (Ag). silver and gold are noble metals which are least reactive. answer 2- when calcium reacts with water hydrogen gas emits in the form of bubbles which makes calcium appear to float. equation- Ca + 2H2O -----> Ca(OH)2 +H2 answer3- To conduct electricity there should be presence of free mobile ions. Ionic compounds in solid state have no free mobile ions due to strong electrostatic force but in molten state this force breaks down resulting in the formation of free mobile ions. answer 4- a) Metals like gold, silver and platinum are least reactive, more lustrous than other metals they do not corrode easily except silver, so we prefer metals like gold, silver and platinum for making jewelry. b) aluminium is used to make cooking utensils because it is a good conductor of heat which helps it to cook food. Also, its corrosion prevents further corrosion because it presents as a layer on utensil which does not allow further corrosion. c)Sulphide and carbonate ores are converted to oxides because it is nearly impossible to directly get metal from sulphide or oxide ore. Metal from its oxide ore can be extracted by using carbon as a reducing agent. Example - extraction of Zn from ZnCO3. answer 5- a) Iodine is a lustrous non-metal and is bluish black (nearly purple) in colour. b) Gallium is a metal which melts when kept on palm of hand. c) Lead is a metal which is a poor conductor of heat. answer 6- name of metal - Aluminium reaction with acid- 3H2SO4 + Al2O3 -------------------> Al2(SO4)3 + 3H2O reaction with base - NaOH + Al2O3 ---------------------> NaAlO2 + H2O answer 7- process of corrosion has taken place. name of metal- copper formula of coating- Cu(OH)2. CuCO3 name of coating- copper carbonate this process can be prevented by making alloys of copper, or by painting, greasing. answer8- sodium and potassium are the most reactive metals and if kept open will react with air in the atmosphere. Keeping them in kerosene will prevent sodium or potassium to react with oxygen in air. answer 9- this reaction cannot be reversed because zinc can displace copper from copper sulphate because zinc is more reactive than copper. Copper cannot displace zinc from zinc sulphate because copper is not reactive than zinc. answer 10- i) Type of bond - Ionic bond. ii) The melting and boiling point of this compound (Z) will be very high because ionic compounds have a very high melting point. iii) No because ionic compounds can only dissolve in other ionic compounds and petrol and kerosene are covalent compounds. iv)this compound can conduct electricity but only in molten or aqueous form. But not in solid form. homework- answer 1- aqua regia is the mixture of nitric and hydrochloric acid. answer2 XO is a metal oxide which reacts with water forms H2 gas in the form of bubbles. But X2O3 is also a metal oxide which reacts with water forms no gas hence, no bubbles a observed.

[@Bacchaparty440_]

Aluminium is a very high reactive metal so they found in combined state and gold,silver is an low reactive they found in free state ❤

[@Thaitukimsing-ku7zg]

Bhaiya tu buhut aage jaiga

[@hacker_gaming69]

Righttt

[@AvinashYadav_shorts_]

1 Aqua regia is a freshly prepared mixture of concentrated HCL and concentrated HNO3 in the ratio of 3:1

[@AvyukthSeshadri]

1-mixture of HCL and HNO3 IN THE RATIO 3:1. 2----xo is more reactive and hence it reacts with water to form bubbles whereas x2o3 is an less reactive oxide and hence they do not react to form afervesence

[@Shivam__kum]

No 2 number ka answer galat h

[@Shivam__kum]

Xo is produce hydrogen gas which release in form of bubble

[@AvyukthSeshadri]

@@Shivam__kum sahi answer kya ha

[@Shivam__kum]

Hydrogen gas form hota h ishliya

[@Pikachu_aryn]

00:47:24 It is a mixture of concentrated HCl and concentrated Hno3 in the ratio of 3:1 It is highly corrosive It is fuming liquid which it dissolved in gold and platinum

[@tabishahmad6273]

Welcome (2023_24) class 10 students 💖

[@All_factory..]

Same ab video dekh reh hai ham sab …….sir is best ❤

[@Kamran15299]

❤❤❤

[@PrakharSanadhya1969]

Kaam se kaam rakha ker bich m mat comment kar

[@user-jt7jg3or7r]

1. Aqua Regia is a fleshy prepared mixture of 1 part of concentrated nitric acid (HNO3) and 3 part of concentrated hydrochloric acid (HCl) this mixture dissolve less reactive metal such as gold and silver . 2. XO is basically a metal oxide when it react with water and form hydrogen so bubbles produced but X2O3 react with water 💧 then hydrogen gas is not produce so no bubbles.

[@shivanshi_rai]

2 mai hi to puch h bhaiya ne.... Why...... ?

[@alonegamer4093]

👍

[@A.d-iti]

Aqua regia is freshly prepared mixture of1 part concentrated nitric acid (HNO3)and 3 part of concentrated HCL this mixture dissolve less reactive metal like silver and gold 2. OX is a metal oxide so when it react with water produce hydrogen gas AND BUBBLE FORMATION TAKE PLACE whereas X2O3 NOT PRODUCE HYDROGEN GAS SO BUBBLE FORMATION CANNOT TAKE PLACE

[@CAPTAINN-090]

HW 1.ANS- Aqua regia is fresh mixture of 1 part of nitric acid and 3 part of HCL.. 2.ANS- XO compound reacts rapidly and makes a effervescence of bubble where X2O3 IS less reactive, therefore doesn't makes effervescence... ❤.❤.❤.❤.

[@hema.rai3922]

47:25 Aqua regia is a homogeneous mixture of HNO3 and HCL which is in the ratio of 1:3

[@user-ze5qk4wp9m]

48:46 XO is highly reactive and hence it reacts with water to form bubbles. On the other hand------ X2 O3 is less reactive oxide and hence no reaction could be seen.

[@Anjaan-insan]

1) Aqua regia consist of HCL and HNO3 in ratio of 1:3 and it is so powerful that it can dissolve any metal in it (like gold) 2) X on combining with H2O produce hydrogen gas (bubbles) but when X2O3 react with H2O The resulting hydrogen is oxidised by Oxygen (present in X2O3) and hence no gas ( bubbles is produced)….X metal can be calcium! If somewhere I am wrong then please correct me.. Thank ❤

[@GulnazJahan-os6fu]

Your answer is very confusing

[@PankajKumar-wo1ve]

i dont think it can be calcium becoz Ca2O3 is not possible na rest i agree with you

[@MaheshKumar-lx1ku]

​@@PankajKumar-wo1vecan it be fe??

[@sangamraj541]

2) x2o3 get react with water and form X(OH)3

[@AKOFFICIAL-kg6gc]

Aqua regia (Latin for "Royal Water") is a solution of nitrohydrochloric acid. The traditional solution is comprised of a 3:1 mixture of hydrochloric acid and nitric acid, respectively. It is commonly used to remove noble metals such as gold, platinum and palladium from substrates, particularly in microfabrications and microelectronics labs. Glassware may also be washed with aqua regia to remove organic compounds only in trace amounts. Aqua regia solutions are extremely corrosive and may result in explosion or skin burns if not handled with extreme caution.

[@AyushKumar-iq8qo]

😂

[@sanjaijha7895]

Aqua Regia is a mixture of 1 part of concentrated HNO3 and 3 parts of concentrated HCL which can easily dissolve less reactive metals like Gold and Platinum

[@vinodbhawate2311]

Good very good 😂

[@goldenboyshubham]

thanks for the video i learned alot i rly like your way of explaining the stuff

[@Legendop445]

Bhaiya we need more videos on different subjects ❤

[@anushkayadav2444]

35:08 When potassium and sodium kept in air they reacts vigorously with air and mositure present in air and catches fire easily to prevent such and accidental fire they are kept immersed in kerosene oil.

[@raziakhter]

Aqua regia is a solution which is made up of mixture of Conc. HCL & Conc. HNO3 in ratio 3:1. ❤❤❤

[@Luckylotnotis]

1}.A prepared mixture of HCl and hno3 in accurate ratio 3:1 . 2}.* Because hydrogen is released in reaction xo+h2o *Hydrogen is not released in this reaction x2o3+H2 .❤❤

[@shivprakashyadav7444]

Aqua regia is the king of acid 😊 which is prepared by the mixture of 3 part of HCL and 1 part of HNO3

[@RajeshSingh-sd2qp]

2) When XO reacts wid H2O then hydrogen gas is liberated and hence bubbles... On the other hand when X2O3 reacts then water is obtained as product and hence no bubbles 💭..

[@RajeshSingh-sd2qp]

1) mixture of one part of concentrated HNO3 and 3 parts od HCl.

[@Sad_munda5]

Sir NaCl dissolves in water which is an covalent compound .44:10 . Like dissolve in like means polar solute dissolve in polar solvent and non polar in non polar solvent.

[@alokgameryt4489]

1 aqua regua is mixture of concentrated HCL and HNO3 in the ratio of 3:1. It is higly explosive in nature and even can dissovle element like Gold. 2 . Since we know that XO is ionic compound which is basic in nature and further react with water and form x hydroxide and H2 gas which cause the formation of bubble. X2O3 is also a ionic compound which is basic in nature but it does not react with water because it react with steam only...

[@Ayushhhhh999]

Aquaregia is a freshly prepared mixture of hcl and hno3 in 3:1 It can desolve gold

[@tarapadanaskar2672]

Platinum also

[@SathvikMacharla]

XO is very high reactive and it reacts with h20 to form XOH liberating h2 also X is soluble in water therefore it is an alkali whereas X2O3 is not reacting with h20 as its not soluable in water.

[@sayyedzoya674]

Aqua regia is ( latin for 'royal water') is a freshy prepaid mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3: 1 it can dissolve gold even thought neither of these acid can do so alone Aqua regia is a highly corrosive fuming liquid it is one of the few reasons that is able to dissolve gold and Platinum

[@Pirinsh-wz4wi]

Aqua regia is concentrated mixture of Hno3 and HCl in ratio of 3:1

[@anushkayadav2444]

4:39 The bubbles of hydrogen gas sticks to the surface of metal and calcium start floating Ca + H2O = Ca(OH)2 + H2

[@seemakumar3927]

Thank you bhaiya ❤ God bless you with happiness ☺️😊

[@PraveenKumar-zn9sj]

1.Aqua regia is a mixture of concentrated HCL and HNO3 with amount of 3:1 2. Xo are react and from bubbles because is high reactive and X2O3 are less reactive bz oxide layer are formed.. 😊 thakyou sir for your great knowlege...

[@GulnazJahan-os6fu]

Aqua regia is a royal water. It is mixture of con.Hcl And conc. Nitric acid in the ratio 3.1 In agua the low relative material like gold,soilver disolved.this help in shining of the matel

[@mistyy4411]

Aqua regia is a freshly prepared mixture of concentrated nitric acid (HNO3) and HCL with ratio 1:3

[@CRICSAMAD]

Carbonate and sulphide ores are usually converted into oxides during the process of extraction called calcination and roasting to make metals oxide and lates it get reduced by the reducing agent like carbon to get metal only

[@Akriti_Singha2020]

Aqua Regiya :- It is a mixture of concentration of HCl and concentration of HNO3 in the ratio 3:1.

[@kanchannagia7750]

Salute to your Hard work sir ❤🙌

[@astanakhan5384]

Aqua regia is freshly prepared mixture of 1 part of nitric acid and 3 part of HCL. And it also called royal water it can dissolve in gold and platinum

[@sarikaawate7994]

Aqua regia is the mixture of concentrate HCl 3 : 1concentrated nitric acid.. -it can dissolve with gold for shining purpose -highly corrosive

[@yashtime55]

Aqua Regia (Latin for “royal water”) is an acidic, corrosive, and oxidative mixture of three parts concentrated hydrochloric acid (HCl) and one part concentrated nitric acid (HNO3) easy sir

[@Happyman___3]

Answer3, Ionic compounds are formed as a result of exchange of ions , and dissociate in water or liquid to form ions thats why it conducts electricity. In solid state it cannot ionises into ions that's why it doesn't conduct electricity.

[@Anonymus-bm9lz]

Because of reactivity As H2 gas attached to its surface ,, Chemical reaction = Ca + H2O = Ca(OH)2 + H2

[@Shindeaarya038]

1 Aqua regia is mixture of conc HCL and Conc.HNO3 in ratio 3:1 2 when metal reacts with water hydrogen gas evolved but when metal reacts with metal oxide hydrogen gas does not evolved therefore no formation of bubbles.

[@Glowup_Aesthetic631]

Best teacher and guide as big brother ❤

[@manvitiwari4454]

Iodine is a dark purple, almost black color in its solid form. When dissolved in water, it forms a brownish-yellow solution.

[@divyanshjaiswalvlogs5848]

Hw 1 is aqua regia it is a freshly prepared mixture of hcl and hno3 in amount of 3:1 it can dissolve like gold (Q2) XO is high reactive oxide it can react with water but X2O3 is less reactive metal they can not react with water

[@Nishthakshorts]

no q 2 is wrong isme h2 gas ka likhna hai

[@divyanshjaiswalvlogs5848]

Achhha jamko sikha Riya hai

[@Ankush-ye5nn]

1 aquaregia of Latin royal water is a mixture of concentrated HCl and concentrated Hno3 in the ratio of 3:1.There are few of reagents that are able to dissolve gold and platinum agua regia is one of them

[@samirbioclasses]

Bhai lagta ha pw sa Phadhe ha

[@Ankush-ye5nn]

@@samirbioclasses nahi bhai

[@SurajPandey-el2kv]

Because Xo is very high reactive element so they produce hydrogen gas when react with water and form (XOH) whereas (X2O3) is less reactive element so they could not produce hydrogen gas

[@Priyanshu_827]

1.) Aluminium is formed in combined state bcz it is highly reactive and reacts with air to form oxide layer , whereas au and ag don't are not very reactiove hence found in free state. 2.) It floats in water bcz the H2 formed floats on the surface of the water. Ca + H20=CA(oh) 2 + h2 4.) Platinum and gold are used fir making jwellery bcz of there lustrous, ductile and malleable property and formed in free state. Al is used bcz it forms a thick layer of aluminum oxide which further prevents the reaction, good conductor of heat also It is easy to convert metal oxide to metal, hence we convert sulphide Or carbonate ore to metal oxide

[@thenameisanurag]

👍👍👍👏👏

[@user-hg4vl6wh9p]

Aqua Regia is a mixture of concentrated HCL and concentrated HNO3 and ratio is 3:1

[@Arshlan-se3lg]

1. Aqua Regia is the chemical which can dissolve the gold,it can be prepared by taking the two acids in 3:1,acids are hcl(3) and hno3(1) .both acid must be take in their concentrate form. 2. xo reacts with water because it unstable and oxide of highly reactive metal XO can be Cao,etc

[@legendcharizard]

Wrong -The reason behind XO reacting with water and Fe2O3 not is because , as per me X is Fe , so when Feo is added to water , it makes Fe203 ( reaction of this is just in the first chapter ) and when Fe2O3 js addednto water , it makes Fe2O3.xH2O. Hence thats the reason It cannot be Ca , as it does not satisfy its valence in X2O3 etc.

[@Arshlan-se3lg]

Thank you for correcting my answer 😊

[@angadsingh.012]

😊

[@Fact-Hasan]

Questions सब कोई बता देता है लेकिन इतना अच्छा explain koi nahi karta hai❤👍

[@CRICSAMAD]

Aluminium is found in combined state because it is reactive metal which react with other element to form combined states where silver and gold found in free states because they are the least reactive metal that's why these metals are found in free states

[@legendcharizard]

The reason behind XO reacting with water and Fe2O3 not is because , as per me X is Fe , so when Feo is added to water , it makes Fe203 ( reaction of this is just in the first chapter ) and when Fe2O3 js addednto water , it makes Fe2O3.xH2O. Hence thats the reason

[@dushyantgangwar4357]

🎉

[@dushyantgangwar4357]

Bhai kon Mera dost banega

[@dushyantgangwar4357]

Thodi mai theri help kar doonga jo ho sakegi aur thodi tum kar dena jo ho sake tumse, baise answer akdam jhakkas diya hai tumne lagta hai 95% lake hi manoge🎉🎉🎉🎉🎉🎉🎉🎉

[@aalekhjain2682]

Nahi Bhai ye galat hai... XO is more reactive hence it forms bubbles of hydrogen gas when it reacts with water while X2O3 is less reactive and hence does not form hydrogen bubbles when immersed in water.

[@legendcharizard]

@@aalekhjain2682 this also can be another answer , both make sense , but as the question is framed having bot X it's neccesary for there to be a singular same metal , which only can be ferrous (Fe 2+) or ferrric (fe 3+) to satisfy those valecys as seen in the questions , or FeO and Fe2O3.

[@Jayanti....]

Hw q.1) aqua regia is a solution of nitric acid(HNO3) and hydrochloric acid (HCL) in the ration 1:3. The solution has the capacity to dissolve low reactive metals such as gold silver etc.

[@THEHATCHINGMONKEY]

Aqua regia-is a mixture of hydrochloric acid and nitric acid in the ratio 3:1.

[@Happyman___3]

Answer 2, Calcium is the most reactive metal and reacts vigorously with water , and realises hydrogen gas. This hydrogen gas doesn't burn , thats why stick to the sirface of calcium and bubbles of hydrogen gas result in the floating of calcium onto water.

[@Call_me_Rahiji]

a)Platinum gold are less ractive so used as jewelly or high melting point or lustrous or also Ductile b)Aluminium has high boiling point or good conductor of heat c)metals can be easily extracted by the reduction 😎 c)

[@gwlegendyt4074]

24:30 amphoteric oxide

[@niteshsharma3941]

1) Aqua regia : It is a mixture of con.HCL and con.H2SO4 Ratio is 3:1 2) xo is more reactive oxide which produces bubbles X2O3 is less reactive oxide

[@manjulaulakh06]

Aqua regia is a solution of HCl and Hno3 in 3:1 and this solution is very corrosive that it can dissolve metals like Au,Ag,etc.

[@Call_me_Rahiji]

After mixing with calcium (metal) react with h20 (acid) Gives product Salt (calcium hydroxide-slaked lime) and release hydrogen that hydgen suroounded the calcium and flaoted it on surface

[@jashanrana2003]

Ans 1 aqua regia is a Sol of con. HCl and nitric acid in ratio of 3ratio 1.which can dissolve gold. Ans 2 because xo elements is more reactive that's why it produces bubbles.

[@paulfilms1533]

Aqua regia is mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1 in which least reactive metals can react such as gold and silver

[@Alfeh447]

Aqua regia is freshly prepared mixture of 3 part of concentratreted hcl aand 1 part of concentrated hno3 which mean in the ratio of 3:1.

[@Fact-T20]

Aqua regia is made up by mixture of concentrated hydrochloric acid(hcl) and con. Nitric acid(hno3) in the ratio of 3:1

[@Studydotcom14]

1) Aluminium being more reactive metal than silver and gold ( less reactive metals) found in combined state whereas silver and gold found in free state.

[@Shraddhashorts77]

Al is high reactive metal so is always in combined state and Ag Au is less reactive are found in free state 😊

[@malhotrakinglover2317]

In question 1 mixture of 3 HCl and 1 hno3 It is also known as royal water

[@ansh7716]

Aqua Regia is a acid which reacts with gold and silver XO is highly reactive material and x203 is a oxide of any metal which is less reactive 50:04

[@RightToKnow403]

1 Mixer of Sulfuric acid and hcl In 3:1 Ratio Xo is high reactive metal so it produces heat when react with water X2o3 is low reactive metal so that's why it does not produce heat

[@GamersAreBeastGAB]

Gaurav sir's official dialogue:- Clear everyone? Samjh mein aaya?😂😌

[@raojaghdoliya0001]

Ans 1 As we know that aluminium are comes in the catagory of moderate reactive element that's why it found in combined state where as silver and gold are least reactive metals that's why they are found in the free state not in combined state.

[@Happyman___3]

Answer 1 , As we know that aluminium is the middle reactive meatel and reacts instant with oxygen in air to for protective layer , thus aluminium is reactive metal and found in the form of combined state in nature as compared to gold and silver , that are found in native state in nature.

[@ManishaYadav005]

Ans.1 ratio of conc. Hcl and conc.HNO3 in 3:1

[@Priyashi_._8377]

Royal water:- it is mixture of hcl and hno3 in the ration 3:1 and it's is used toh dissolve gold

[@Sarkarineet]

Great work bhaiya love you so much ❤❤❤

[@Akriti_Singha2020]

Ionic compounds conduct electricity in molten state because in molten state their electrons are freely moving but in solid state electrons are attached due to this ionic compounds conduct electricity in molten state.

[@CRICSAMAD]

Platinum gold and silver is used for making jewellery because it is the most least reactive metals which dont lose their shiny surfaces due to corrosion.

[@royal_challengers_58]

Thanks You , I like these videos

[@a.cgamerff5626]

Aqua regia is a mixture ok 3 part ok HCl and 1 part ok nitric acid which can dissolve low reactive metal then it formed

[@Call_me_Rahiji]

Beacuse ionic compounds have both cation and anion after undergoes molten states it moves and conduct but when in solid it is tightly packed

[@Znnnlk]

Sir Aluminium found in free state because Al is highly reactive and existed in ore form as bauxite and Al is an amphoteric oxide which shows both acidic and basic behaviour

[@Znnnlk]

Sorry by mistake I write free state it is in combined state combined state

[@Znnnlk]

Silver and gold are less reactive and they will not react with oxygen , water or acids . Therefore , they will not form ore also . They will not corrode easily and used as precious metals . Hence, they are found in free state

[@S.tiwari6157]

Aqua regia = it is a mixture of concentrated nitric acid and concentrated hydrochloric acid in ratio 3:1

[@anushkayadav2444]

9:50 Ionic compounds conduct electricity in molten and in solution because they melts when mixed in solution and ions are free to conduct electricity but in solid state they does not conduct electricity because ions are at fixed position and ions can not move to conduct electricity

[@motovlogsUP]

Hii

[@anushkayadav2444]

20:34 1= Iodine 2= gallium 3= lead

[@iruzzfashionvibe]

Aqua regia is the mixture of HCl and HNO3 in the ratio of 3:1. It is a highly corrosive and fuming liquid which can dissolve anything even gold. XO me in hydrogen ka formation hota h whereas X2O3 mein nahi hota h

[@legendcharizard]

Aqua regia - is a highlyvigorus acid made up of concetrated Hcl acid and concetrated HNO3 in ratio 3:1, capable of easily disolving platimun and gold

[@bijaybind8817]

Tell me reaction of hcl + hno3 🫠

[@legendcharizard]

It's not a reaction it's a mixture of HCl and HNO3

[@bijaybind8817]

@@legendcharizard tell me zn + Hno3 🤔

[@legendcharizard]

Hno3 is a oxidizing agent , zn +hno3 -> Zn(No3)2 + H20 + NO/N2O/NO2 ( nitrade reduces into one of the 3 gases

[@sharwankhoja4116]

Respect for teacher❤

[@DeepaShingh-ns2ps]

Thanks bhaiya for helping us

[@akhildixit3923]

Ionic conducts electricity in molten state and not in solid state because In molten state break in to tins and flow charge through it and not solid state due to their rigid structure

[@aasthajha_official]

Formation of H2 gas will lead to Formation of bubbles in XO compound

[@khushikashyap-nf4bf]

Because XO IS THE ALKALI METAL COMPOUND WHICH IS SOLUBLE IN WATER BY REACTING TO FORM H2 GAS BUT X2O3 is not soluble in water also not react with water and not form h2 gas

[@CRICSAMAD]

Aluminium is highly reactive metals but still used for making cooking utensils because it is a good conductor of heat which makes the easy to cook food

[@Priyanshukumar0895]

Thank you so much bhaiya for this great hard working for all board students

[@yeobo999]

XO - Ca or Mg They both are the formula of xo (cao , mgo) as mg nd ca are reactive metals , bubbles are formed nd for X2O3 - Al2O3 , Al have the formula wd X2O3 although hydrogen gas is produced, and it is no very reaction metal thats why bubbles are not seen/observed

[@dyanamo-dv5vs]

aqua Regia is a freshly prepared mixture of one part of concentrated nitric acid and 3 part of concentrated hyro chloric acid in the 1: 3 😊

[@Believe_in_karma10]

It's is freshly prepared mixture of1part of con. nitric acid hno3 or 3part of con.HCl in dissolve even gold and platinum metals they do not react with strong acid like HCl hno3 or gold mith use for clearing gold and platinum ornaments

[@CRICSAMAD]

Calciuk metal start floating on its surface because hydrogen gas bubbles sticked on the surface of calcium which makes buoyancy force thats why calcium start floating on the surface. Ca(s) + H20(l) =} Ca(OH)2 + H2(g)

[@Astromit.]

It is a Mixture form of HCL and HNO 3 HNO :HCL ===3:1