(a) Explain the following terms :(i) Rate of a reaction(ii) Activation energy of a reaction (b) The decomposition of phosphine, PH3, proceeds according to the following equation:4 PH3 (g) → P4 (g) + 6 H2 (g)It is found that the reaction follows the following rate equation :Rate = K [PH3].The half-life of PH3 is 37.9 s at 120° C.(i) How much time is required for 3/4th of PH3 to decompose?(it) What fraction of the original sample of PH3 remains behind after 1 minute?

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