NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

(a) Explain the following :

(i)NF3 is an exothermic compound whereas NCl3 is not.

(ii) F2 is most reactive of all the four common halogens.

(b) Complete the following chemical equations :

(i) C+H2SO4conc

(ii) P4+NaOH+H2O

(iii) Cl2+F2excess 

(i) F is more electronegative than Cl.

   The difference in the electronegativity between N and F is much more than the difference between electronegativity of N and Cl. So there is need of much more energy to break the N-F bond.

(ii) Because of the low bond dissociation energy F2 readily dissociates into atoms and reacts with other substances readily.

(b) (i) C+2H2SO4conc.CO2+2SO2+2H2O

(ii) P4+3NaOH+3H2OPH3+3NaH2PO2

(iii) Cl2+3F2excess2CIF3

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