NEET-XII-Chemistry
Previous Year Paper year:2017
- #27A first order reaction has a specific reaction rate
of ``10^{-2} sec^{-1}. How much time will it take for
20 g of the reactant to reduce to 5g ?
(1) 693.0 sec
(2) 238.6 sec
(3) 138.6 sec
(4) 346.5 secdigAnsr: 3Ans : (3)
Sol. For first order reaction
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[ CODE - Y ]
t
0
]A[
]A[log
t
303.2k =
5
20log
t
303.210 2 =-
4log
10
303.2t 2-=
= 64.138
10
6020.0303.2
2 =
×
- sec