Steam at \(100~^{\circ}\text{C}\) is passed into \(20~\text{g}\) of water at \(10~^{\circ}\text{C}.\) When water acquires a temperature of \(80~^{\circ}\text{C},\) the mass of water present will be: 
[Take specific heat of water \(= 1~\text{cal g}^{-1}~^\circ\text{C}^{-1}\) and latent heat of steam \(= 540~\text{cal g}^{-1}\)]
1. \(24~\text{g}\)
2. \(31.5~\text{g}\)
3. \(42.5~\text{g}\)
4. \(22.5~\text{g}\)

Liquid oxygen at \(50~\text K\) is heated up to \(300~\text K\) at a constant pressure of \(1~\text{atm}.\) The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

1.		2.
3.		4.