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Q.

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

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a

Rate is proportional to the surface coverage

b

Rate is inversely proportional to the surface coverage

c

Rate is independent of the surface coverage

d

Rate of decomposition is very slow

answer is A.

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Detailed Solution

Surface area is  more,more is reactant molecules are adsorbed and more number of effecive collisions occurs.Rate increases.
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