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Chapter: 12th Chemistry : p-Block Elements-II

p-Block Elements-II: Choose the best answer

Chemistry : p-Block Elements-II: Choose the best answer with Answers, Solution and Explanation

Choose the best answer:

 

1. In which of the following , NH3 is not used?

a) Nessler’s reagent

b) Reagent for the analysis of IV group basic radical

c) Reagent for the analysis of III group basic radical

d) Tollen’s reagent

 

2. Which is true regarding nitrogen?

a) least electronegative element

b) has low ionisation enthalpy than oxygen

c) d- orbitals available

d) ability to form pπ −pπ bonds with itself

 

3. An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

a) 1s2 2s2 2p4

b) 1s2 2s2 2p3

c) 1s2 2s2 2p6 3s2 3p2

d) 1s2 2s2 2p6 3s2 3p3

 

4. Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively

a) P4(red) and PH3

b) P4(white) and PH3

c) S8 and H2S

d) P4(white) and H2S

 

5. In the brown ring test, brown colour of the ring is due to

a) a mixture of No and NO2

b) Nitroso ferrous sulphate

c) Ferrous nitrate

d) Ferric nitrate

 

6. On hydrolysis, PCl3 gives

a) H3PO3

b) PH3

c) H3PO4

d) POCl3

 

7. P4O6 reacts with cold water to give

a) H3PO3

b) H4P2O7

c) HPO3

d) H3PO4

 

8. The basicity of pyrophosphorous acid ( H4P2O5) is

a) 4

b) 2

c) 3

d) 5

 

9. The molarity of given orthophosphoric acid solution is 2M. its normality is

a) 6N

b) 4N

c) 2N

d) none of these

 

10. Assertion : bond dissociation energy of fluorine is greater than chlorine gas

Reason: chlorine has more electronic repulsion than fluorine

a) Both assertion and reason are true and reason is the correct explanation of assertion.

b) Both assertion and reason are true but reason is not the correct explanation of assertion.

c) Assertion is true but reason is false.

d) Both assertion and reason are false.

Solution:

Both assertion and reason are wrong. The converse is true.

 

11. Among the following, which is the strongest oxidizing agent?

a) Cl2

b) F2

c) Br2

d) l2

 

12. The correct order of the thermal stability of hydrogen halide is

a) HI > HBr > HCl > HF

b) HF > HCl > HBr > HI

c) HCl > HF > HBr > HI

d) HI > HCl > HF > HBr

 

13. Which one of the following compounds is not formed?

a) XeOF4

b) XeO3

c) XeF2

d) NeF2

 

14. Most easily liquefiable gas is

a) Ar

b) Ne

c) He

d) Kr

 

15. XeF6 on complete hydrolysis produces

a) XeOF4

b) XeO2F2

c) XeO3

d) XeO2

 

16. On oxidation with iodine, sulphite ion is transformed to

a) S4 O62

b) S2 O62

c) SO42

d) SO32

 

17. Which of the following is strongest acid among all?

a) HI

b) HF

c) HBr

d) HCl

 

18. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

a) Br2 > I2 > F2 > Cl2

b) F2 > Cl2 > Br2 > l2

c) I2 > Br2 > Cl2 > F2

d) Cl2 > Br2 > F2 > I2

 

19. Among the following the correct order of acidity is

a) HClO2 < HClO < HClO3 < HClO4

b) HClO4 < HClO2 < HClO < HClO3

c) HClO3 < HClO4 < HClO2 < HClO

d) HClO < HClO2 < HClO3 < HClO4

 

20. When copper is heated with conc HNO3 it produces

a) Cu(NO3)2 , NO and NO2

b) Cu(NO3)2 and N2O

c) Cu(NO3)2 and NO2

d) Cu(NO3)2 and NO

 

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