When a $60 \, W$ electric heater is immersed in a gas for $100 \, s$ in a constant volume container with adiabatic walls,the temperature of the gas rises by $5^{\circ} \, C$. The heat capacity of the given gas is $......... \, J \, K^{-1}$ (Nearest integer).
- A$1100$
- B$1200$
- C$1000$
- D$1600$
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$(i)$ The unit of heat capacity is ......... .
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