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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 3 · Q18
(a) Define Effective collision. 1 + 1 (b) Write the unit of (i) second order reaction and (ii) zero order reaction
(a)
Define Effective collision. $\displaystyle 1$ + $\displaystyle 1$
(b)
Write the unit of
(i)
second order reaction and (ii) zero order reaction
Marking-scheme solution
(a)
The collisions among the reacting species which results in the formation of
products.
(b)(i)
mol−$\displaystyle 1$ Ls−$\displaystyle 1$ / mol L−1S−$\displaystyle 1$
(ii)
mol L−1S−$\displaystyle 1$
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.