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JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Match List I with List II : List I (Reaction) List II (Observation / Product) (A) NH ₄ Cl(aq) + NaNO ₂ (aq) (I) Very pure N ₂ gas is evolved (B) Thermal decomposition of ( NH ₄)₂ Cr ₂ O ₇ (II) N ₂ gas is evolved along with a green solid residue (C) Thermal decomposition of Ba(N ₃)₂ (III) N ₂ gas is evolved along with an aqueous salt solution (D) NH ₄ Cl + Ca(OH) ₂ + Heat (IV) A pungent smelling gas is evolved Choose

Options

  1. A(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
  2. B(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
  3. C(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  4. D(A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Correct answer

A. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Step-by-step solution

(A) NH ₄ Cl(aq) + NaNO ₂ (aq) N ₂ (g) + 2 H ₂ O(l) + NaCl(aq) . Here, N ₂ gas is evolved along with an aqueous salt solution ( NaCl ). So, (A) matches with (III). (B) ( NH ₄)₂ Cr ₂ O ₇ N ₂ (g) + 4 H ₂ O(g) + Cr ₂ O ₃ (s) . The residue Cr ₂ O ₃ is a green solid. So, (B) matches with (II). (C) Ba(N ₃)₂ Ba(s) + 3 N ₂ (g) . Thermal decomposition of barium or sodium azide gives very pure nitrogen gas. So, (C) matches with (I). (D) 2 NH ₄ Cl + Ca(OH) ₂ 2 NH ₃ (g) + 2 H ₂ O(l) + CaCl ₂ . Ammonia ( NH ₃ ) is a pungent smel

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