(a) Given reasons for the following:

        (i) Sulphur in vapour state shows paramagnetic behaviour.

        (ii) N-N bond is weaker than P-P bond.

        (iii) Ozone iss thermodynamically less stable than oxygen.

(b) Write the names of gas relased when CU is added to

        (i) dilute HNO3 and

        (ii) conc. HNO3

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) (i) In vapour state, sulphur partly exists as S2 molecule, which like O2 has two upaired electrons in the antibonding \pi^{\ast } orbitals and hence exhibits paramagnetic.

(ii) The single N-N bond is weaker than P-P bond because of high interelectronic repluion of the non-bonding electrons, owing to the small bond length.

(iii) O3 is the thermodynamically unstable and decomposes to O2. The decomposition is exothermic.

(b) (i) 3Cu+8HNO_{3}\overset{cold dil.}{\rightarrow}2NO+Cu(NO_{3})_{2}+4H_{2}O

      (ii) Cu +3HNO_{3}\xrightarrow[acid]{stong}NO_{2}+Cu(NO_{3})_{2}+H_{2}O

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