250 g of water and equal volume of alcohol of mass 200 g are replaced successively in the same calorimeter and cool from `60^@C` to `55^@C` in 130 s and 67 s, respectively. If the water equivalent of the calorimeter is 10 g, then the specific heat of alcohol in `cal//g^@C` is

Options

A. `1.30`
B. `0.67`
C. `0.62`
D. `0.985`

Answer

C

Explanation

Rate of cooling of water = Rate of cooling of alcohol
`implies ((250+10) xx 1xx(5))/(130) = ((200s + 10)xx5)/(67)`
`implies ` Specific heat of alcohol s = `0.62`