MCQ
Which of the following endothermic processes are spontaneous
- AMelting of ice
- BEvaporation of water
- CHeat of combustion
- ✓Both $(a) $ and $(b)$
Melting of ice and Evaporation of water is show endothermic process
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| List$-I$ | List$-II$ |
| $(I)$ Radius of the $n^{\text {th }}$ orbit | $(P)\propto n ^{-2}$ |
| $(II)$ Angular momentum of the electron in the $n^{\text {th }}$ orbit | $(Q)\propto n ^{-1}$ |
| $(III)$ Kinetic energy of the electron in the $n^{\text {th }}$ orbit | $(R)\propto n ^0$ |
| $(IV)$ Potential energy of the electron in the $n^{\text {th }}$ orbit | $(S)\propto n ^1$ |
| $(T)\propto n ^2$ | |
| $(U)\propto n ^{1 / 2}$ |
[Use mass of electron $\left.=9.1 \times 10^{-31}\, \mathrm{~kg}, \mathrm{~h}=6.63 \times 10^{-34}\, \mathrm{~J} \mathrm{~s}, \pi=3.14\right]$