TS EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Give the correct characteristic colours of the products $(P, Q, R, S)$ formed in the following reactions. A) $NO + {NO}_{2} \overset{< 250 K}{⟶} P$ B) $2 {NO}_{2} ⟷ Q$ C) $Pb {({NO}_{3})}_{2} \overset{673 K}{⟶} R + PbO$ D) ${HNO}_{3} + P_{4} O_{10} ⟶ S + 4 {HPO}_{3}$

A

$P$ $Q$ $R$ $S$

Blue Colourless Brown Colourless
B

$P$ $Q$ $R$ $S$

Colourless Blue Colourless Brown
C

$P$ $Q$ $R$ $S$

Colourless Colourless Blue Brown
D

$P$ $Q$ $R$ $S$

Brown Blue Colourless Colourless

Verified Solution

Answer & Solution

Correct Answer

(A)

$P$	$Q$	$R$	$S$
Blue	Colourless	Brown	Colourless

Step-by-step Solution

Detailed explanation

(a) 2NO + N2O4→250 K2N2O3 (Blue colour in liquid or solid state) (b) 2NO2→Cool N2O4 Unlike NO2, N2O4 is diamagnetic since it has no unpaired electrons. The liquid is also colourless but can appear as a brownish yellow liquid due to the presence of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From TS EAMCET

Explore more questions on app

Give the correct characteristic colours of the products (P, Q, R, S) formed in the following reactions. A) NO+NO2⟶<250 KP B) 2NO2⟷Q C) PbNO32⟶673 KR+PbO D) HNO3+P4O10⟶S+4HPO3

Step-by-step Solution

Give the correct characteristic colours of the products $(P, Q, R, S)$ formed in the following reactions. A) $NO + {NO}_{2} \overset{< 250 K}{⟶} P$ B) $2 {NO}_{2} ⟷ Q$ C) $Pb {({NO}_{3})}_{2} \overset{673 K}{⟶} R + PbO$ D) ${HNO}_{3} + P_{4} O_{10} ⟶ S + 4 {HPO}_{3}$