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Question

A bottle contains  100%  phenyl. 13  of it is replaced with water. The operation Is repeated 4 times. What is the ratio of phenyl: water after the last operation?


Your Answer
A
16:81
Your Answer
B
1:5
Your Answer
C
14:82
Correct Answer
D
None of these

Solution

The correct option is B None of these

Option (d)

Liquid A left taken nth operationInitial quantity of A in the vessel=(ab)nan

Amount of phenyl remaining  =(113)4=1681

Therefore, ratio or phenyl:water = 16:65. (81-16=65)

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