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Topic Question Set

Q 11 :

Observe the following reactions at T(K).

I. $A \to p r o d u c t s$

II. $5 {Br}^{-} (a q) + {BrO}_{3}^{-} (a q) + 6 H^{+} (a q) \to 3 {Br}_{2} (a q) + 3 H_{2} O (l)$

Both the reactions are started at 10.00 am. The rates of these reactions at 10.10 am are same. The value of $- \frac{Δ [{Br}^{-}]}{Δ t}$ at 10.10 am is $2 \times 10^{- 4} mol L^{- 1} \min^{- 1}$ . The concentration of A at 10.10 am is $10^{- 2} mol L^{- 1}$ . What is the first order rate constant (in $m i n^{- 1}$ ) of reaction I? [2026]

$10^{- 2}$
$4 \times 10^{- 3}$
$10^{- 3}$
$2 \times 10^{- 3}$

1

2

3

4

(2)

Q 12 :

Decomposition of A is a first order reaction at T(K) and is given by $A (g) ⟶ B (g) + C (g) .$

In a closed 1 L vessel, 1 bar A(g) is allowed to decompose at T(K). After 100 minutes, the total pressure was 1.5 bar. What is the rate constant $(i n m i n ⁻ ¹)$ of the reaction? (log 2 = 0.3) [2026]

$6.9 \times 10 ⁻ ²$
$6.9 \times 10 ⁻ ¹$
$6.9 \times 10 ⁻ ⁴$
$6.9 \times 10 ⁻ ³$

1

2

3

4

(4)

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