CBSE Class 12 Chemistry The p block elements Type MLL Questions Answers

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The p- block elements : TYPE- MLL

One Mark questions

1. Why is H₃PO₃ diprotic?

2. Nitrogen does not form pentahalide like phosphorous, why?

3. H₂O is a liquid while H₂s is a gas ,why?

4. Arrange NH₃ PH₃ AsH₃ BiH₃ SbH₃ in the increasing order of basic strength.

5. Oxygen is a gas while sulphur is a solid, why?

6. Write the formula of hyponitros acid.

7. Why does Al not react with conc. nitric acid?

8. Can PCl₅ act as an oxidising agent and reducing agent?

9. Why does NO₂ readily dimerise?

10. Why is BiH₃ the strongest reducing agent amongst all the hydrides of nitrogen family?

11. Write the chemical formula of peroxodisulphuric acid.

12. Why does NH₃ act as a Lewis base /complexing agent?

13. What is the basicity of H₃PO₄?

14. Why does R₃P = O exist but R₃N = O does not (R = alkyl group)?

15. Why does the reactivity of nitrogen differ from phosphorus?

16. Why is white phosphorous highly reactive?

17. Why group 16 members are called chalcogens?

18. OF₄ is not known but SF₄ is known .Explain

19. Solid PCl₅ exists as an ionic solid, Why?

20. Bismuth is a strong oxidizing agent in pentavalentstate, why? Two Marks questions

21. Draw the shapes of SF₄, BrF₃ on the basis of VSEPR theory.

22. (a) Why is atomic radius of Argon more than that of Chlorine ?

(b) Why is ionization enthalpy of Nitrogen more than oxygen?

23. (a) Arrange F₂,Cl₂,Br₂,I₂ in the increasing order of bond dissociation energy.

(b) Arrange HOClO,HOClO₂,HOClO₃ in the increasing order of acidic strength.

24.Explain giving suitable reasons:

(i) NH₃ has higher boiling point than PH₃

(ii) SbF₅ is known but BiF₅ is unknown.

25.Explain giving suitable reasons:

(i) SF₆ is well known but SH₆ is not known.

(ii) Proton affinity of NH₃ is more than PH_{3 .}

26. Explain giving suitable reasons.

(i) Sulphur in vapour form is paramagnetic in nature.

(ii) Catenation properties of Phosphorous is more than Nitrogen.

27. Give chemical equations ,when :

(a). Ammonium dichromate is heated ?

(b). Sodium azide is heated?

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