Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Number of electrons surrounding Kr in KrF2 is :

  • 10

  • 6

  • 4

  • 8


A.

10

Total no. of electron which are foundaround , Kr in KrF2 are 10 .


2.

Hybridization present in ClF3 is :

  • sp2

  • sp3

  • dsp2

  • sp3d


D.

sp3d

In ClF3 molecule , Cl atom is sp3dhybridised and due to the presence oftwo lone pairs of electrons , it hasT-shaped geometry .


3.

Which has smallest size ?

  • Na+

  • Mg2+

  • Ne

  • O2-


B.

Mg2+

Among isoelectronic species , sizedecreases with increase in nuclearcharge .Hence , the order of size is_

Mg2+ < Na+ < O2-


4.

H - I - O bond angle in H2O2 :

  • 90o

  • 180o

  • 109.5o

  • 94.8o


D.

94.8o

The bond angle of H2O2 is 94.8o .


5.

Hydrolysis of sodium acetate gives :

  • acidic solution

  • basic solution

  • amphoteric solution

  • neutral solution


B.

basic solution

Sodium acetate is a salt of weak acid and strong base hence its aquous solution is basic .

C-H3CONaH2OCH3COOHWeak+NaOHStrong


6.

Atomic number of an element is equal tothe number of :

  • protons

  • neutrons

  • electrons

  • protons + neutrons


D.

protons + neutrons

Atomic number of an element is alwaysequal to the number of protons in itsatom while mass number is equal to thesum of the number of protons andneutrons .


7.

Electron deficient molecule is :

  • CCl4

  • PCl5

  • BF3

  • SF6


C.

BF3

Structure of BF3 is ;

In this example octet is incomplete .


8.

Which is the correct relation for diffusionof gases :

  •  d

  •  d

  •  1d

  • none of these


C.

 1d

According to Graham for an ideal gas ,

r1d


9.

Cationic hydrolysis gives the followingsolution :

  • acidic

  • basic

  • neutral

  • amphoteric


B.

basic

Cationic hydrolysis always forms basicsolution .


10.

Isotopic pair is :

  • 20X4021X40

  • 20X40 , 20X41

  • 40X2041X20

  • None


B.

20X40 , 20X41

Isotopes are the atoms of an element which have same atomic number but different mass number .