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A beaker contains 200 g of water. The he...

A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. The initial temperature of water in the beaker is `20^@C` .If 440 g of hot water at `92^@C` is poured in it, the final temperature (neglecting radiation loss) will be nearest to

A

`58^@ C`

B

`68^@ C`

C

`73^@ C`

D

`78^@ C`

Text Solution

Verified by Experts

The correct Answer is:
B
From principle of calorimetry
`m_("water") xx S_(w) xx (theta-20)+(mS)xx(theta-20)`
=`m_("hot water") xx S_(w) xx(92 -theta)`.
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