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For reaction X rarr Y+Z half life is ind...

For reaction `X rarr Y+Z` half life is independent of the concentration of X .After 20 minutes volume of gas Z is 10mL and after very long time it is 50mL ,the rate constant is :
1) `(2.303)/(20)log5`
2) `(2.303)/(20)log1.25`
3) `(2.303)/(10)log2`
4) `(2.303)/(20)log4`

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