Subject

Chemistry

Class

JEE 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

11.

19 g of a mixture containing NaHCO3 and Na2CO3 on complete heating liberated 1.12 L of CO2 at STP. The weight of the remaining solid was 15.9 g. What is the weight (in g) of Na2CO3 in the mixture before heating?

  • 8.4

  • 15.9

  • 4.0

  • 10.6


12.

Under which one of the following conditions do real gases approach the ideal gas behaviour?

  • Low temperature and high pressure

  • High temperature and high pressure

  • High temperature and low pressure

  • Low temperature and low pressure


Advertisement

13.

Which one of the following is the ratio of the lowering of vapour pressure of 0.1 M , aqueous solutions of BaCl2, NaCl and Al2SO3 respectively?

  • 3 : 2 : 5

  • 5 : 2 : 3

  • 5 : 3 : 2

  • 2 : 3 : 5


A.

3 : 2 : 5

Lowering of vapour pressure is a colligative property. It depends on the number of particles ofthe solute.

BaCl2  Ba2+ + 2Cl-; 3 ions

 NaCl  Na+ + Cl- ; 2 ions

Al2(SO4)3  2Al3+ + 3SO43- ; 5 ions

Hence, the ratio of lowering of vapour pressure is 3 : 2 : 5.


Advertisement
14.

Which one of the following exhibits enantiomerism?

  • BeCH2-CH2-CH2-CH2Br

  • H3C-CH(Br)-CH2-CH2-CH3

  • H3C-CH2-CH2-CH2Br

  • H3C-CH2-CBr2-CH3


Advertisement
15.

Nitrobenzene on reduction using zinc in alkaline medium results in X. The number of sigma (σ) and pi (π) bonds in X is-

  • 24 σ, 7 π

  • 24 σ, 6 π

  • 27 σ, 7 π

  • 24 σ, 6 π


16.

Which property among the following is same for both hydrogen and deuterium molecules?

  • Bond energy

  • Melting point

  • Boiling point

  • Bond length


17.

In which of the following reactions hydrogen is not liberated?

  • Reaction of fused NaOH with C

  • Reaction of NaOH with sulphur

  • Heating the concentrated NaOH with Si

  • Reaction of zinc with NaOH


18.

Which one of the following statements is not correct?

  • Moissan boron is amorphous

  • The reaction between boron and concentrated HNO3, gives N2O.

  • Amorphous boron on heating with oxygen forms B2O3.

  • Boron is a non-conductor of electricity.


Advertisement
19.

Which one of the following is a correct set?

  • Diamond, sp2

  • Graphite, sp3

  • Diamond, sp

  • Graphite, sp2


20.

Which air pollutant is responsible for Bhopal gas tragedy?

  • PIC

  • CFC

  • MIC

  • CO


Advertisement