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Question

Consider the reaction 2A(g)3B(g)+C(g). Starting with pure A initially, the total pressure is doubled in 3 hrs. The order of the reaction might be:

A
zero
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B
first
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C
second
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D
unpredictable from this data
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Solution

The correct option is D unpredictable from this data
2A(g)3B(g)+C(g)
at time t, 12p 3p p
total pressure in 3 hrs =12p+3p+p=1+2p
Since the initial pressure is not given here. The order of the reaction is unpredictable.
Answer will be D.

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