Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

1.

Which is correct regarding size of atom?

  • N < O

  • B < Ne

  • V > Ti

  • Na > K


2.

Which of the following is not sp2 hybridised?

  • Graphite

  • Graphene

  • Fullerene

  • Dry ice


3.

A diatomic gas at pressure P, compressed adiabatically to half of its volume, what is the final pressure?

  • (2)1.4P

  • P/(2)1.4

  • (2)5/3P

  • P/(2)5/3


4.

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

  • Ti2+,3.87 B.M.

  • Cr2+, 4.90 B.M.

  • Co3+,3.87 B.M.

  • Mn2+,4.90 B.M.


Advertisement
5.

The equilibrium constant for the reaction,

12H2(g)+12I2(g)HI(g) is Kc

Equilibrium constant for the reaction 2HI(g) H2(g) + I2(g)  will be

  • 1/Kc

  • 1/(Kc)2

  • 2/Kc

  • 2/(Kc)2


6.

Which of the following pairs represent isotones?

  • As3377,Se34 78

  • Pt78195,Os76190

  • Ag47108,Cd48112

  • Hf72178,Ba56137


7.

In Omolecule, the formal charge on the central O-atom is

  • 0

  • -1

  • -2

  • +1


Advertisement

8.

Which of the following represents the correct bond order?

  • O2+<O2->O22-

  • O2->O22->O2+

  • O22->O2+>O2-

  • O2+>O2->O22-


D.

O2+>O2->O22-

Hence, the coorect Bond order is O2+>O2->O22-

Ion

Total no of electron

              MO configuration   Bond order
 o2+    15 KK σ2s2 σ*2s2  σ2px2 π2px2=π2py2π*2px1=π*2py0    2.5
 o2-    17 KK α2s2σ*2s2σ2pz2π2px2=π2py2π*2px2=π*2py1    1.5
 o22-    18 KKσ2s2 σ*2s2 σ2pz2 π2px2=π2py2 π*2px2=π*2py2    1.0


Advertisement
Advertisement
9.

What is the oxidation number of Br in KBrO?

  • + 6

  • + 7

  • + 5

  • + 8


10.

Which ofthe following statements is incorrect?

  • Li+ has minimum degree of hydration.

  • The oxidation state of K in KO2 is + 1.

  • Na is used to make a Na/Pb alloy.

  • MgSO4 is readily soluble in water.


Advertisement