CBSE Class 12 Chemistry The p Block Elements Questions

CBSE Class 12 Chemistry The p Block Elements Questions. CBSE,CCE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  



1. In group 15 elements, there is considerable increase in covalent radius from N to P but small increase from As to Bi. Why?
[Hint : Due to completely filled d- and / or f-orbitals in As, Sb and Bi.
2. The tendency to exhibit – 3 oxidation state, decreases down the group in group 15 elements. Explain.
[Hint : Due to increase in size and decrease in electronegativity down the groups].
3. Maximum covalence of Nitrogen is ‘4’ but the heavier elements of group 15 show covalence greater than ‘4’. Why?
4. Nitrogen exists as a diatomic molecule with a triple bond between the two atoms, whereas the heavier elements of the group do not exist as E2 at room temperature. Assign a reason.
[Hint : pπ – pπ multiple bonds are formed by N due to its small size.]
5. The ionization enthalpies of group 15 elements are higher than those of corresponding members of group 14 and 16 elements. Assign the reason.
6. The boiling point of PH3 is lesser than NH3. Why?
7. NO2 dimerises to form N2O4. Why?
[Hint : Due to presence of odd electron on N]
8. Draw the structure of N2O5 molecule.
9. How does ammonia solution react with Ag+ (aq)? Write the balanced chemical equation.
10. Why does NH3 forms intermolecular hydrogen bonds whereas PH3 does not?
[Hint : Due to strong electronegativity, small size of Nitrogen atom and presence of lone pair of electrons on N atom]

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