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Question: Answered & Verified by Expert
Which of the following graphs represent a first order reaction $(a=$ initial concentration of reactant, $x=$ concentration of reactant consumed, $t=$ time)?

ChemistryChemical KineticsTS EAMCETTS EAMCET 2018 (07 May Shift 1)
Options:
  • A (i), (ii), (iv)
  • B (iii), (iv)
  • C (ii), (iii)
  • D (i), (ii)
Solution:
1642 Upvotes Verified Answer
The correct answer is: (i), (ii)
For a first order reaction
$$
\text { Rate }=-\frac{\Delta[A]}{\Delta t}=k[A]
$$
It is a straight line plot with negative slope when concentration of reactant is considered as in (i) and half-life for first order is independent from concentration, as in plot (ii).

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