p-Block Elements-II: Choose the best answer

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