Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at \(100~^{\circ}\mathrm{C}\), while the other one is at \(0~^{\circ}\mathrm{C}.\) If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is:

Steam at \(100~^{\circ}\mathrm{C}\) is passed into \(20~\text{g}\) of water at \(10~^{\circ}\mathrm{C}\). When water acquires a temperature of \(80~^{\circ}\mathrm{C}\), the mass of water present will be: 
[Take specific heat of water \(= 1~\text{cal g}^{-1}~^\circ\mathrm{C}^{-1}\) 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 \(50\) K is heated up to \(300\) K at a constant pressure of \(1\) atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?

1.		2.
3.		4.