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Match List-I with List-II, match the gas evolved during each reaction. List-I (a) (nH4)2Cr2O7 Δ → (b) KMnO4 + HCl → (c) Al + NaOH + H2O → (d) NaNO3 Δ → List-II (i) H2 (ii) N2 (iii) O2 (iv) Cl2 Choose the correct answer from the options given below:

1. (a)-(II), (b)-(III), (c)-(I), (d)-(IV)
2. (a)-(III), (b)-(I), (c)-(IV), (d)-(II)
3. (a)-(II), (b)-(IV), (c)-(I), (d)-(III)
4. (a)-(III), (b)-(IV), (c)-(I), (d)-(II)

Correct answer: (a)-(II), (b)-(III), (c)-(I), (d)-(IV)

Solution

The correct matches are based on the specific reactions: (a) produces nitrogen gas (N2) from the decomposition of ammonium dichromate, (b) generates oxygen gas (O2) when potassium permanganate reacts with hydrochloric acid, (c) yields hydrogen gas (H2) from the reaction of aluminum with sodium hydroxide and water, and (d) produces chlorine gas (Cl2) from the thermal decomposition of sodium nitrate.

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