MCQ
A black sulphide ppt when treated with ozone becomes white, the white compound is
- A$ZnSO_4$
- B$CaSO_4$
- C$BaSO_4$
- ✓$PbSO_4$
Few examples of multiple bonding are $C = C , C = O , N = C$
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${R_2}SiC{l_2} + {H_2}O \to (1)\xrightarrow{{polymerisation}}(2)$
Compound $(2)$ in above reaction is



$(I)$ $\left[ {{{\left( {P{h_3}P} \right)}_2}PdC{l_2}PdC{l_2}} \right]$
$(II)$ $\left[ {NiBrCl\left( {en} \right)} \right]$
$(III)$ $N{a_4}\left[ {Fe{{\left( {CN} \right)}_5}NOS} \right]$
$(IV)$ $Cr{(CO)_3}{\left( {NO} \right)_2}$
$(I)$ - $(II)$ - $(III)$ - $(IV)$