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

BOARD

(a) What happens when

(i) chlorine gas is passed through a hot concentrated solution of NaOH?

(ii) sulphur dioxide gas is passed through an aqueous solution of a Fe (III) salt?

(b) Answer the following:

(i) What is the basicity of H3PO3 and why?

(ii) Why does fluorine not play the role of a central atom in interhalogen compounds?

(iii) Why do noble gases have very low boiling points?

(a) (i)3Cl2+6NaOHHeat5NaCl+NaCIO3+3H2O

(ii) SO2+Fe2SO43+2H2O2FeSO4+2H2SO4

(b) (i) Basicity of H3PO3=2

Because basicity is the number of replaceable H+ ions in an acid and H3PO3 is a Dibasic acid.

(ii) Because F being smaller, it cannot accomodate larger sized other halogen atoms around it. Due to the absence of d-orbitals, F does not show positive oxidation state of +3, +5, +7 needed for the formation of polyatomic interhalogen compounds.

(iii) Because the atoms of these elements are held together by weak van der Waal's forces of attraction.

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