CBSE Class 12 · 2011 · Delhi · Chemical KineticsShort Answer

Identify, giving reasons, the reaction order from each of the following rate constants:
i) k = 2.3 × 10

^{- 5}

L mol

^{- 1}

^{- 1}

ii) k = 3 × 10

^{- 4}

^{- 1}

Answer: (i) Second order (ii) First order

Solution

Units of

k

for order

n

(mol L^{- 1})^{1 - n} s^{- 1}

.
(i) L mol

^{- 1}

^{- 1}

⟹

1 - n = - 1

⟹

n = 2

— second order.
(ii) s

^{- 1}

⟹

1 - n = 0

⟹

n = 1

— first order.

CBSE Class 12 Board · 2011 · Delhi · Subjective