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  4. For the reaction, 2 PH 3 → 2P +3 H 2 The decomposition of phosphine on the surface of tungsten at high pressure is

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Q. For the reaction, $2 PH _{3} \to 2P +3 H _{2}$
The decomposition of phosphine on the surface of tungsten at high pressure is

Chemical Kinetics

Solution:

Decomposition of $PH _{3}$ (and also $NH _{3}$ ) on the surface of tungsten catalyst are zero order reactions