NCERT Solutions class 12 Chemistry The p block elements In text Questions

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NCERT Class 12 Chemistry Chapter-wise Solutions

•  1 – The Solid State
• 2 – Solutions
• 3 – Electrochemistry
• 4 – Chemical Kinetics
• 5 – Surface Chemistry
• 6 – General Principles and Processes of Isolation of Elements
• 7 – The p-Block Elements
• 8 – The d-and f-Blocks Elements
• 9 – Coordination Compounds
• 10 – Haloalkanes and Haloarenes
• 11 – Alcohols, Phenols and Ethers
• 12 – Aldehydes, Ketones and Carboxylic Acids
• 13 – Amines
• 14 – Biomolecules
• 15 – Polymers
• 16 – Chemistry in Everyday Life

CHAPTER SEVEN THE P-BLOCK ELEMENTS

• 7.1 Group 15 Elements
• 7.2 Dinitrogen
• 7.3 Ammonia
• 7.4 Oxides of Nitrogen
• 7.5 Nitric Acid
• 7.6 Phosphorus – Allotropic Forms
• 7.7 Phosphine
• 7.8 Phosphorus Halides
• 7.9 Oxoacids of Phosphorus
• 7.10 Group 16 Elements
• 7.11 Dioxygen
• 7.12 Simple Oxides
• 7.13 Ozone
• 7.14 Sulphur – Allotropic Forma
• 7.15 Sulphur Dioxide
• 7.16 Oxoacids of Sulphur
• 7.17 Sulphuric Acid
• 7.18 Group 17 Elements
• 7.19 Chlorine
• 7.20 Hydrogen Chloride
• 7.21 Oxoacids of Halogens
• 7.22 Interhalogen Compounds
• 7.23 Group 18 Elements

NCERT Solutions class 12 Chemistry The p block elements

In-text question

1. Why are pentahalides more covalent than trihalides?

2. Why is the strongest reducing agent amongst all the hydrides of Group 15 elements?

3. Why is less reactive at room temperature?

4. Mention the conditions required to maximize the yield of ammonia.

5. How does ammonia react with a solution of ?

6. What is the covalence of nitrogen in?

7. Bond angle in is higher than that in . Why?

8. What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of ?

9. Write a balanced equation for the hydrolytic reaction of in heavy water.

10. What happens when is heated?

11. What is the basicity of ?

12. What happens when is heated?

13. List the important sources of sulphur.

14. Write the order of thermal stability of the hydrides of Group 16 elements.

15. Why is a liquid and a gas?

16. Which of the following does not react with oxygen directly? Zn, Ti, Pt, Fe

17. Complete the following reactions:

(i)

(ii)

18. Why does act as a powerful oxidizing agent?

19. How is estimated quantitatively?

20. What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt?

21. Comment on the nature of two S-O bonds formed in molecule. Are the two S-O bonds in this molecule equal?

22. How is the presence of detected?

23. Mention three areas in which plays an important role.

24. Write the conditions to maximize the yield of by Contact process.

25. Why is for in water?

26. Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of and .

27. Give two examples to show the anomalous behaviour of fluorine.

28. Sea is the greatest source of some halogens. Comment.

29. Give the reason for bleaching action of .

30. Name two poisonous gases which can be prepared from chlorine gas.

31. Why is ICl more reactive than ?

32. Why is helium used in diving apparatus?

33. Balance the following equation:

34. Why has it been difficult to study the chemistry of radon?

NCERT Solutions class 12 Chemistry

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