STD 11 - 3. Classification of elements and periodicity in properties — JEE STD 11 Science — Question

Assertion $A$: Permanganate titrations are not performed in presence of hydrochloric acid.

Reason $R$ : Chlorine is formed as a consequence of oxidation of hydrochloric acid.

In the light of the above statements, choose the correct answer from the options given below.

Statement $I$ : Sulphanilic acid gives esterification test for carboxyl group.

Statement $II$ : Sulphanilic acid gives red colour in Lassigne's test for extra element detection.

In the light of the above statements, choose the most appropriate answer from the options given below :

($1$)  $W$ and $\mathbf{X}$ are, respectively

$[A]$ $O_3$ and $P_4 O_6$   $[B]$ $O_2$ and $P_4 O_6$   $[C]$ $O_2$ and $P_4 O_{10}$    $[D]$ $O_3$ and $P_4 O_{10}$

($2$) $Y$ and $Z$ are, respectively

$[A]$ $N_2 O_3$ and $\mathrm{H}_3 \mathrm{PO}_4$

$[B]$ $N_2 O_5$ and $\mathrm{HPO}_3$

$[C]$ $N_2 O_4$ and $HPO_3$

$[D]$ $N_2 O_4$ and $H_3 PO_3$

Give the answer of quetion ($1$) and ($2$)