Heat is required to change 1 kg of ice at `-20^@C` into steam. `Q_1` is the heat needed to warm the ice from `-20^@C` to `0^@C`, `Q_2` is the heat needed to melt the ice, `Q_3` is the heat needed to warm the water from `0^@C` to `100^@C` and `Q_4` is the heat needed to vapourize the water. Then

Options

A. `Q_(4)gtQ_(3)gtQ_(2)gtQ_(1)`
B. `Q_(4)gtQ_(3)gtQ_(1)gtQ_(2)`
C. `Q_(4)gtQ_(2)gtQ_(3)gtQ_(1)`
D. `Q_(4)gtQ_(2)gtQ_(1)gtQ_(3)`

Answer

A

Explanation

`Q_(1)=(1000)(20)0.5=1000=10^(4)cal,Q_(2)=(1000)80=80000=8xx10^(4)cal`
`Q_(3)=(1000)100(1)=100000=10^(5)calandQ_(4)=(540)(1000)=5.4xx10^(5)cal`