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. MOST IMPORTANT QUESTIONS OF STRUCTURE OF ATOM CLASS 9 BASED ON NCERT
Best Mcq Structure of Atom Class 9 Full Chapter | CBSE Class 9 Chemistry Chapter 4
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[@mcqncert]

For other Chapter MCQ of Class 9, watch playlist in link below MCQ CLASS 9 SCIENCE NCERT: kzbin.info/aero/PLqL8x8BtIUaT1SbMWeVDc1fFZYP_WhWoe MCQ Class 9 MATHS NCERT: kzbin.info/aero/PLqL8x8BtIUaSiKCfulGjjiJH-KvLDRW8N MCQ NCERT CLASS 9 SST: kzbin.info/aero/PLqL8x8BtIUaT9VD179l25bruqC4bsP6wS

[@KESHAV_2026_JEE]

Hi

[@Aniket_9296]

8

[@Harshit-pp1he]

Thank you bhaiya I scored 32% in mid term (I was failed 😢) Then I started to see videos on KZbin I scored 98% in UT-3,4 I will give my best in December exams

[@Harshit-pp1he]

KZbin is the key to success

[@Krish-u4i]

1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00

[@shreya______]

The valency of Na+ :0 The valency of Mg2+:0 Valence electron of magnesium will be 8

[@rajeevyadav7086]

Bahi valency nhi puchi hai valence electrons pucha gya hai

[@baruahbrothers2377]

18:44 For Mg2+, Valence electrons = 8 Valency = 0 For Na+, Valence electrons = 8 Valency = 0 Sir, is it correct ??

[@mcqncert]

Correct

[@googlemoney6090]

@@mcqncert what you mean it's not correct its abselutely correct may your channel grow 🥰🥰🥰🥳

[@kingorqueen7119]

𝚈𝚎𝚜

[@rishabhrathore5294]

15:18

[@ankitak6326]

Sir I wanna ask you "what are isotones " Plz..... Reply sir I really need it 🙏

[@mcqncert]

Which have same number of neutrons

[@ankitak6326]

@@mcqncert thank you sir

[@tanveethakre6457]

Its isotopes not isotones😊

[@vinodkumarjha7883]

@@ankitak6326 same no of neutrons different atomic number ,mass number,species ,ec example sodium and magnesium

[@vinodkumarjha7883]

@@tanveethakre6457 r u mad isotopes have same no of neutrons

[@LaxmanMarndi-v5i]

The valency of Mg2+=0 and the valency of Na+=0

[@baruahbrothers2377]

17:30 Sir, In Question no. 33, The correct answer is C. Explanation:: a) the same physical properties : Isotopes don't have same physical properties as their masses are different. So this option is wrong. b) different chemical properties : Isotopes have the same chemical properties as their number of electrons and protons are same. So this option is wrong. c) different number of neutrons : We all know that isotopes are of the same elements. This means that their atomic numbers are the same, i.e numbers of protons are also same. Now , we all know that mass number is nothing but the same of Number of protons and Number of neutrons. As the mass numbers are different but number of protons are same. Therefore, the number of neutrons have to be different. So, this option is correct. d) different atomic numbers : This option is wrong as they have the same atomic numbers. So, the correct answer is C. Sir, pls justify my answer...

[@mcqncert]

Very good beta.. Bravo

[@annyeongindia4751]

Awesome

[@yasir_shafi_vlogs]

Sir what is flotation? Sir plz reply me

[@mcqncert]

To float on fluid..

[@pihushorts2611]

Valence electron in MG^2+ is 8.

[@คlคภ]

Electric config of Na^+ is 2,8 bcoz it is cation v= 1 Electric config of Mg^2+ is 2,8 (same reason) V= 2

[@jyotiverma7907]

Answers : Valency of na+ = +1 Valency of mg2+ = +2 Valence electron of mg2+ = 8

[@anmolyadav7395]

Bhai ,, high level ke mcq bnao inka answer to baccha bhi de sakta hai 😅 Thoda acche mcq bnao

[@cricketeditz1933]

0:35 0:35 0:35 0:35 0:35

[@Harshit-pp1he]

17:22 8 in both

[@RAJESHKUMAR-dx4ek]

Very useful video to us Thank you sir Nice👏👏👏👏👏 sir

[@mcqncert]

Ans33 is option C

[@hemantakumar1659]

Which kind of facility I can gate from you (in this chennal) If will be member.

[@Akash_Gupta770]

Sir one mistake is there 10:29.. You speak has but has is not there .

[@ashifraja6786]

Valence electron in mg 2+ is 8

[@THE_HACKER__03]

Valence electrons of Na+and Mg2+ =Na=8 and Mg=8 Valency of Na+ = 0 and Mg2+ =0

[@MohsinKhan-nt2su]

Ap ne boht acha smjaya he sir

[@vasavidara2006]

You are genius and thank you

[@ShAnTaNu-x]

33/35❤ 18:41

[@Harshit-pp1he]

17:22 8

[@badrikamahanta9947]

Thanks for help sir 🙏

[@MadhuKumari-qc9ri]

Well done explain 😊🎉

[@arunchopra100]

0.52 approximately mat yaad kro real main 1840 times hota h

[@simransehdev279]

Valence electrons of Mg2+ is equals to 8 .. Nd valency = 0

[@ghanshyammahto6482]

Thank you so much sir 👃👃

[@shahastabegum914]

Na+ velency is 0 And Mg velency is also 0 And Mg²+configuration is 2,8,2

[@shahastabegum914]

It is right??

[@DPELMohdSiddique]

15:39 sir mass number same nahi h sahi se dekho

[@Anmol__yt]

1:20

[@karansinghav7439]

sir very easy question But some ques increase my knowledge related this chapter . so the video is perfect 👍

[@mcqncert]

Glad to hear that

[@laxmipriyasahu9842]

34/35😮😮😊really I don't believe myself 😮😮😮

[@shubham7563]

Na+ Valance electron= 8 valency = 0 Mg²+ Valance electron = 8 Valency= 0 Very easy question sir 😊😊😊😊

[@shubham7563]

@@legendgaming2180 Valency Na = +1 Na+ =0 Mg = 2 Mg²+ = 0

[@JyotiRajwade-gz3qc]

Electric configuration of Na = 2,8,1 lose one electron (v= 1) Electric configuration of Mg = 2,8,2 lose two electron (v= 2)

[@ashifraja6786]

Sir this video is very helpful for me Thank u so much 😎😎😊😊😊😊

[@Talentina998]

33 q option c

[@Indian_Blink-x9p]

29/35 ☺️

[@abdulwaheed8385]

nice sir thankyou it is very helpful

[@shifashowkat83]

question no. 35 ans 2,8,1

[@badrikamahanta9947]

Nice explanation sir 🙏

[@mcqncert]

Thanks and welcome

[@shylaja183]

Thank you so much sir for example thank you🎉❤👍🤝

[@Arpitapatel96]

Sir please make a video valancy🙏🙏🙏🙏🙏💯💯

[@LaxmanMarndi-v5i]

Q.33 answer is option C

[@swatipandey1188]

Thank you so much sir😊😊

[@santoshkumarsingh468]

Thank you very much sir it really helpfull😄

[@jyotiverma7907]

@LEARNING WITH SHASHANK SHEKHAR Sir , In Question 33 I think Option-(C) should be correct because you only told that It has different mass no. , So It has different no. Of neutrons. But they have same no. Of protons that's why atomic no. Is same..

[@sudipapal1226]

Ya I also think so.... And sir told that they have same chemical property but in the option it is given that they have different chemical property.

[@rahultickoo5533]

@@mcqncert Dear, you are yourself saying, chemical properties are same. But in option it is written as different. Would be better if you would just pin a comment mentioning the correction.

[@mcqncert]

@@rahultickoo5533 yes you are correct ans 33 is different number of neutrons..

[@sarvajanikbaethakabarauni6873]

Ans - 4

[@Harshit-pp1he]

17:50 valency -1,+2

[@poonamkeshri7801]

Galat h bhai dono ka valency 0 hogaaa

[@Harshit-pp1he]

I am in 10thbnow

[@mahfuzbepari2972]

Thanks becoming ready for exam

[@aditi480A2Z]

17:29 Na+ → 10 Mg²+→10

[@Harshit-pp1he]

Only outermost shell electrons will be counted

[@Gupta00211]

Question no. 11 me 12000 nhi balki 20000 me 1 rebound hua tha

[@krrishd9003]

12000 tha

[@ayushsrivastav7691]

Valance electron mg2+ =8

[@IBS0009]

Simply best

[@Krish-u4i]

1:00

[@dggamingyt.3111]

Which isotope is used to detect tumour sir is ka kiya answer ha

[@mcqncert]

Cobalt 60

[@Next_Level00198]

Correct answer -Arsenic-74

[@Next_Level00198]

​@@mcqncertcobalt -60 r used in the treatment of cancer

[@SeemaSharma-vs3sh]

Very easy questions thank you sir 🙂😊😊☺️☺️🥰🥰💞💞❤️❤️😍😍😍😍🌞🌞🌞🌞🌞⭐⭐💖💖👍👍❣️❣️😗😗

[@devil6433]

Is culumb is the SI unit ??

[@mcqncert]

Yes of charge

[@khara_manas]

Coulomb is SI unit of charge

[@sheetaljaiswal945]

Nice videos Very helpful...🥰🥰🥰

[@jod_zerox]

Isotope of iodine is used in treatment of cancer not iodine

[@crazynationgaming8242]

You have been misinformed brother

[@jod_zerox]

I mean "iodine" is not used but a "isotope of iodine " is used 😢

[@crazynationgaming8242]

@jod_zerox that's actually an isotope of cobalt not iodine! Google it if you don't believe

[@drawingwallah2379]

Excellent

[@pranavpalaskar1985]

Helpful

[@kundankumarpal1234]

Valence electron of Na+ 8 Valency = 0 Valence electron of Mg²+ 8 Valency =0

[@Deepaksharma-dv1di]

Sir aap ye kis aapo se banate ho plz bataiye mujhe bhi

[@studywithalfisha]

Mg²± =8

[@Sigmaedits79]

Sir nucleus ki radius 10 ^-5 hoga 😊

[@mcqncert]

No

[@harphoolmawaliya630]

Iam sararti

[@danyeerdx]

Sir question number 33 ka answer kya hai

[@AjayVarshney-ny8pq]

Thank you very much sir 😊

[@manoranjantripathy2669]

Thanks sir good explanation . Very best MCQ are there😅

[@futuredoctors7795]

Great sirr g🙏🙏🙏

[@shivambaunthiyal6447]

33 is wrong answer will be c

[@ajishalini5370]

Thank you sir

[@parinith.p1981]

thanks a lot sir!!!...

[@kanishkasharma3511]

35 / 32 😁😁

[@joshuakjustin6907]

Your video is helpful 😢

[@shifashowkat83]

its charge of electron is 1.6×10 raise power minus 19 not proton

[@PKGamer-569]

toppers can see this vedio before 1 day😂

[@PayalYadav-y3w]

No backbecher 😂

[@ashokdaila3999]

Sahi baat hai 😂😂

[@ayushsingh479]

@@PKGamer-569 ok

[@badrebel4241]

Thavks for my knowledge increasing🥺😵

[@DivyaSharma-cd1wl]

Na+ Valence electron - 8 Valency - 0 Mg2+ Valence electron - 8 Valency - 0

[@DivyaSharma-cd1wl]

Sir this question is very very easy 💗💗

[@Deepanshu_7065]

😊1Hrs left My exam😢

[@GAKYYofficial4358]

11-1=10 na

[@SunilKumar-oi2cl]

The valence electron of Mg + 2 in is 8 and valency is zero valence electron of Na+is equal to 8 valency is zero

[@gokueditz09w]

So much easy questions

[@AnilKumar-dy5gr]

Thank you sir you are the best teacher in the world 🎉❤

[@rishi4794]

Sir plZ periodic test 3 ke old papaers aarange kr dijiye class 9

[@mcqncert]

Chapter??

[@rishi4794]

@@mcqncert full paper including physics ,chem,bio Ch-4,11,13

[@AbdulQayoom-h6v]

Thanku sir ❤❤

[@MohsinKhan-nt2su]

Your are genius sir

[@aadityathapa5676]

Thanks you bro

[@drawingwallah2379]

Superb

[@brijrajbhaichaudhary7041]

I have answered 33 out of 35 correct without options

[@aaravx0001]

2'8'1

[@The_studified_classes]

sir i think que no 6 is misprinted, there should be negatively charged sphere.

[@Alexop547]

Yes ..electrons are negatively charged...

[@KGMC.NURSING_PCB]

❤❤❤❤

[@adarshyadavanshi6773]

Electron

[@subikshakarthikeyan352]

Thanks sir

[@letsplaywithmarshmello3446]

20 elements keep atomic number Nahi mass

[@drawingwallah2379]

Good