An immersion heater, in an insulated vessel of negligible heat capacity brings 10 g of water to the boiling point from `16^@C` in 7 min. Then Q. The water is replaced by 200 g of alcohol, which is heated from `16^@C` to the boiling point of `78^@C` in 6 min 12 s whereas 30 g are vapourized in 5 min 6 s. The specific heat of alcohol isA. `0.6 J//kg^@C`B. `0.6 cal//g^@C`C. `0.6 cal//kg^@C`D. `6 J//kg^@C`

An immersion heater, in an insulated vessel of negligible heat capacit

1.	An immersion heater, in an insulated vessel of negligible heat capacity brings 10 g of water to the boiling point from `16^@C` in 7 min. Then Q. The water is replaced by 200 g of alcohol, which is heated from `16^@C` to the boiling point of `78^@C` in 6 min 12 s whereas 30 g are vapourized in 5 min 6 s. The specific heat of alcohol isA. `0.6 J//kg^@C`B. `0.6 cal//g^@C`C. `0.6 cal//kg^@C`D. `6 J//kg^@C`
Answer» Correct Answer - B With 200 g of alcohol in the vessel, the temperature Quantity of heat absorbed by alcohol `Q_a=C_am_a(theta_f-theta_i)` `=C_axx(200g)(78-16)^@C` Heat given by heater `Q_a=Pt_2=(20(cal)/(s))xx372s` Specific heat of alcohol `C_a=(20xx372)/(200xx62)=0.6(cal)/(g^@C` `=(0.6xx4.186J)/(10^-3kg^@C)=2.5xx10^3(J)/(kg^@C)` `=2.5(K)/(g^@C)`

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