Free NCERT Solutions For Class 12 Chemistry Chapter 7 : The p-Block Elements Free PDF Download

Intext Exercise 1

Question 1:
Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionization and electronegativity

Question 2:
Why does the reactivity of nitrogen differ from phosphorus?

Intext Exercise 2

Question 3:
Discuss the trends in chemical reactivity of group 15 elements.

Intext Exercise 3

Question 4:
Why does NH3 form hydrogen bond but PH3 does not?

Question 5:
How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions
involved.

Question 6:
How is ammonia manufactured industrially?

Question 7:
Illustrate how copper metal can give different products on reaction with HNO3.

Question 9:
The HNH angle value is higher than HPH, HAsH and HSbH angles. Why?
[Hint: Can be explained on the basis of sp3 hybridisation in NH3 and only s-p bonding between hydrogen and other elements of the group].

Question 12:
Nitrogen exists as diatomic molecule and phosphorus as P4. Why?

Question 14:
Why does nitrogen show catenation properties less than phosphorus?

Question 15:
Give the disproportionation reaction of H 3PO 3.

Question 17:
Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.

Question 18:
Why is dioxygen a gas but sulphur a solid?

Question 20:
Which aerosols deplete ozone?

Question 22:
How is SO2 an air pollutant?

Question 23:
Why are halogens strong oxidising agents?

Question 24:
Explain why fluorine forms only one oxoacid, HOF

Question 25:
Explain why inspite of nearly the same electronegativity, oxygen forms hydrogen bonding while chlorine does not

Question 40:
List the uses of Neon and argon gases

Intext Questions

Question 1:
Why are pentahalides more covalent than trihalides?

Question 8:
What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO2 ?

Question 9:
What happens when PCl5 is heated?

Question 12:
What happens when H3 PO 3 is heated?

Solution 12:

Question 16:
Which of the following does not react with oxygen directly?

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

Question 22:
How is the presence of SO2 detected?

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