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Published on: 18/06/2021
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Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test1.
A reaction having equal activation energies for forward and reverse reactions has ______.
ΔG = 0
ΔH = 0
ΔH = ΔG = ΔS = 0
ΔS = 0
2.
Nitric oxide (NO) reacts with oxygen to produce nitrogen dioxide
2NO(g) + O2(g) ⟶ 2NO2(g)
If the mechanism of reaction is ______.
NO + O2 \(\overset { K }{ \rightleftharpoons } \) NO3 (fast)
NO3 + NO \(\overset { { K }_{ 1 } }{ \rightleftharpoons } \) NO2 + NO2 (slow)
Rate = K' [NO] [O2]
Rate = K' [NO] [O2]2
Rate = K' [NO]2 [O2]
Rate = K' [NO]3 [O2]
3.
For an exothermic chemical process occurring in 2 steps as
(i) A +B ⟶ X (slow) ;
(ii) X ⟶ AB (fast)
The progress of the reaction can be best described by (x- intermediate).
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None of these
4.
Which of the following statement is not correct?
Molecularity of a reaction cannot be fractional
Molecularity of a reaction cannot be more than three
Molecularity of a reaction can be zero
Molecularity is assigned for each elementary step of mechanism.
5.
The Unit of rate constant and rate of reaction are same for ______.
First order
second order
Third order
zero order
1.
(b)
ΔH = 0
2.
(c)
Rate = K' [NO]2 [O2]
3.
(c)
4.
(c)
Molecularity of a reaction can be zero
5.
(d)
zero order
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