$\text{X(s)} \xrightarrow{\text{dil HCl}} \text{Y} \uparrow \xrightarrow[\text{NaOH}]{\text{Na}_2[\text{Fe}(\text{CN})_5(\text{NO})]} \text{Purple solution}$ …

Chemistry

Problem

\text{X(s)} \xrightarrow{\text{dil HCl}} \text{Y} \uparrow \xrightarrow[\text{NaOH}]{\text{Na}_2[\text{Fe}(\text{CN})_5(\text{NO})]} \text{Purple solution}

Gas

Y

has been allowed to react with following species in neutral/acidic medium :


(a) $\text{FeCl}_3$	(b) $\text{CuSO}_4$	(c) $\text{BaCl}_2$	(d) $\text{SO}_2$
(e) $\text{Cr}_2\text{O}_7^{2-}$	(f) $\text{CH}_3\text{COONa}$	(g) $\text{Hg}^{2+}$

Then calculate value of

(P + Q - R)

P

: Number of species which undergoes redox reaction with gas

Y

Q

: Number of species with which gas

Y

undergoes precipitation.

R

: Number of species with which gas

Y

produce no observable change.