Question

In a first order reaction the concentration of reactant
decreases from 800 mol/dm³ to 50 mol/dm³ in 2 × 10⁴ sec.
The rate constant of reaction in sec⁻¹ is:
(a) 2 × 10⁴ (b) 3.45 × 10⁻⁵
(c) 1.386 × 10⁻⁴ (d) 2 × 10⁻⁴

Answer 1

Explanation:

In a first order reaction the concentration of reactant

decreases from 800 mol/dm³ to 50 mol/dm³ in 2 × 10⁴ sec.

The rate constant of reaction in sec⁻¹ is:

(a) 2 × 10⁴

(b) 3.45 × 10⁻⁵

(c) 1.386 × 10⁻⁴

(d) 2 × 10⁻⁴

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