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


Account for the following :

(a) Phosphorus shows high tendency for catenation.

(b) F2 is more reactive than CIF3 but CIF3 is more reactive than Cl2.

(c) Nitrogen is found in gaseous state.

(d) Decomposition of ozone molecule is a spontaneous process.

(e) SF6 is inert towards hydrolysis.

(a) The bond strength of P-P is more tan N-N, therefore, phosphorus shows more tendency for catenation than nitrogen.

(b) Because the bond between Cl-F is weaker than the bond between Cl-Cl due to less effective overlapping of orbitals of Cl-F than Cl-Cl.

The F2 is most reactive due to its high electrode potential.

(c) Due to small size and high electronegativity nitrogen forms pπ-pπ multiple bonds, which are held together by weak Van-der Waal's forces of attraction which can be easily broken. Hence N2 exists as a gas at room temperature.

(d) Because O3 is thermodynamically unstable and its decomposition results in liberation of heat          (H is -ve) and increase in entropy S is +ve so G becomes -ve and process becomes spontaneous.

(e) In SF6, S is protected by 6F atoms and does not allow H2O molecules to attach on it. So SF6 inerts towards hydrolysis.

Difficulty Level:

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