Question

Column I		Column II
A		p	Sodium fusion extract of the compound gives Prussian blue colour with $FeS{O}_4$
B		q	Sodium fusion extract of the compound gives blood red colour with $FeS{O}_4$
C		r	Lassaigne's extract (L.E.) in $C{S}_2$ and $C{l}_2$ water gives orange colour
D		s	L.E. with ${\left[Fe(CN{)}_{5}NO\right]}^{2-}$ gives violet colour

• A. A= s ,B= p ,C= r ,D= q,r
• B. A= r ,B=s ,C=q,r ,D= p
• C. A= p ,B=r ,C=q ,D= s
• D. A= q,r ,B=q,C= s ,D= r

Answer 1

Answer: (B)

$(a\to r)$ Diazonium salts do not give positive test for $N$, because on heating they decompose before combining with Na to form $C{N}^{\ominus }$ ion, which is a necessary condition for $n$ - test
On the other hand, it gives the test for $B{r}^{\ominus }$ ion (organic layer test)
(b $\to s$ ) It contains $C$ and $S$, so it gives nitroprusside test. ${\left[Fe(CN{)}_{5}NO\right]}^{-2}$, is nitrorpuside ion
$(c\to q,r)$ It contain $C$ and $N$, so it gives (positive) test for $N$ and the test for $B{r}^{\ominus }$
$(d\to p)$ It contains $C$ and $N$, so it gives positive test for $N$ and also gives test for $I^{\ominus }$ (but that is not given in the equation)