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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(nearest integer)
[Given : Molar mass of $\mathrm{AB}_2=200 \mathrm{~g} \mathrm{~mol}^{-1} \cdot \mathrm{K}_{\mathrm{b}}$
(molal boiling point elevation const. of water)
$=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, boiling point of water $=100^{\circ} \mathrm{C}$;
$\mathrm{AB}_2$ ionises as $\left.\mathrm{AB}_2 \rightarrow \mathrm{A}^{2+}+2 \mathrm{~B}^{-}\right]$
$R-Br + Cl^- \xrightarrow{{DMF}} R-Cl + Br^-$
which one of the following has the highest relative rate?
Oxidation state of central atom in compound $(B)$ is
