Question

Which of the following statements is/are correct for the gas D?
(I) It has the state of hybridisation $s{p}^3$
(ID Gas can be identified by $CaC{l}_2$ solution
(III) Gas can be identified by $Pb(OAc{)}_2$ solution
(IV) Gas can be identified by passing through sodium nitroprusside solution

• A. I, IV
• B. I, III
• C. III only
• D. I, II, IV

Answer 1

The correct option is B I, III

1) Sulphide ion $S^{2-}$ (sulfied chemical test

2) (i)If soluble, add a few drops lead ethanoate solution.

(ii) If solid, add dil $HCl\left(aq\right)$ acid, test smelly gas with damp lead ethanotate paper (old name lead acetate).

3) (i)Black precipitate of lead sulphide.

(ii) Rotten egg smell of hydrogen sulphide and the $H_{2}S$ gas turns lead ethanotate paper black

4) (1)$P{b}^{2+}\left(aq\right)+S^{2-}aq\Rightarrow Pb{S}_s$

(ii)$M{S}_s+2H^{+}aq\Rightarrow M^{2+}aq+H_2{S}_g$

e.g $M=Pb,Fe,Cu,Nietc)$ The reaction (i) above occurs on the

lead (ii) ethanotate paper (old) name lead acetare)