Match the column I with column II and mark the appropriate choice-S-No-Column I S-No-Column IIA H2g - Br2g- 2HBrg i - H - - U - 2RTB PCl5g- PCl3g - Cl2gii - H - - U - 3RTC N2g - 3H2g- 2NH3giii - H - - UD 2N2O5g- 4No2g - O2giv - H - - U - RT

The correct option is B (A) → (iii), (B) → (iv),(C) → (i),(D) → (ii). Δ H=Δ U+Δ n _ g RT (A) H _ 2 (g) + Br _ 2 (g) ⟶ #160; 2 ...

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Byju's Answer

Standard XII

Chemistry

Heat of Formation

Match the col...

Question

Match the column I with column II and mark the appropriate choice:

S.No. Column I S.No. Column II
(A) $H_{2} (g) + B r_{2} (g) \to 2 H B r (g)$ (i) $△ H = △ U - 2 R T$
(B) $P C l_{5 (g)} \to P C l_{3 (g)} + C l_{2 (g)}$ (ii) $△ H = △ U + 3 R T$
(C) $N_{2 (g)} + 3 H_{2 (g)} \to 2 N H_{3 (g)}$ (iii) $△ H = △ U$
(D) $2 N_{2} O_{5 (g)} \to 4 N o_{2 (g)} + O_{2 (g)}$ (iv) $△ H = △ U + R T$

(A)

\to

(iii), (B)

\to

(i),(C)

\to

(ii),(D)

\to

(iv).

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(A)

\to

(iii), (B)

\to

(iv),(C)

\to

(i),(D)

\to

(ii).

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(A)

\to

(ii), (B)

\to

(i),(C)

\to

(iv),(D)

\to

(iii).

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(A)

\to

(iv), (B)

\to

(ii),(C)

\to

(i),(D)

\to

(iii).

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Solution

The correct option is B (A) $\to$ (iii), (B) $\to$ (iv),(C) $\to$ (i),(D) $\to$ (ii).
$Δ H = Δ U + Δ n_{g} R T$

$(A) H_{2} (g) + {B r}_{2} (g) ⟶ 2 H B r (g) ∴ Δ n_{g} = 2 - 1 - 1 = 0 ∴ Δ H = Δ U$

$(B) P {C l}_{5} (g) ⟶ P {C l}_{3} (g) + {C l}_{2} (g) ∴ Δ n_{g} = 2 - 1 = 1 ∴ Δ H = Δ U + R T$

$(C) N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g) ∴ Δ n_{g} = 2 - 3 - 1 = - 2 ∴ Δ H = Δ U - 2 R T$

$(D) 2 N_{2} O_{5} (g) ⟶ 4 N O_{2} (g) + O_{2} (g) ∴ Δ n_{g} = 4 + 1 - 2 = 3 ∴ Δ H = Δ U + 3 R T$

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S.No.	Column I	S.No.	Column II
(A)	$H_{2} (g) + B r_{2} (g) \to 2 H B r (g)$	(i)	$△ H = △ U - 2 R T$
(B)	$P C l_{5 (g)} \to P C l_{3 (g)} + C l_{2 (g)}$	(ii)	$△ H = △ U + 3 R T$
(C)	$N_{2 (g)} + 3 H_{2 (g)} \to 2 N H_{3 (g)}$	(iii)	$△ H = △ U$
(D)	$2 N_{2} O_{5 (g)} \to 4 N o_{2 (g)} + O_{2 (g)}$	(iv)	$△ H = △ U + R T$

Match the column I with column II and mark the appropriate choice:S.No.Column I S.No.Column II(A)H2(g)+Br2(g)→2HBr(g) (i)△H=△U−2RT(B)PCl5(g)→PCl3(g)+Cl2(g)(ii)△H=△U+3RT(C)N2(g)+3H2(g)→2NH3(g)(iii)△H=△U(D)2N2O5(g)→4No2(g)+O2(g)(iv)△H=△U+RT