Ajay and Rakesh live in Rajgarh town of Churu districk of Rajasthan. As usual, the summer in this area of Rajasthan in extremely hot. Ajay's sister is getting engaged in the month of May, Ajay's family and relatives were waiting for the guests to arrive for the engagement ceremony. They had brought a slab of ice and put it in a tub of water for cooling the warm bottles of soft drinks. Just when they had finished drinking all the cold soft drink bottles, the gruests (including would-be bridegroom) arrive. Ajay and Rakesh were in a fix because they had only warm bottles of soft drinks left with them. Ajay suggested that they should put the warm soft drink bottles in the ice cold water which they already had in the tub but Rakesh did not agree with him Rakesh quickly brought a big slab of ice from the nearby shop crushed it well. He then put the warm soft drink bottles in an empty tub and surrounded them well with crushed ice. These warm soft drink bottles got colled in a short time and were served to the guests. All the guests enjoyed cold soft drinks on a very hot day and felt refreshed.
(a) What is the temperature of water formed from freshly melted ice ?
(b) What is the temperature of melting ice ?
(c) A person holds some ice-old water in his left hand palm and a piece of ice in his right hand palm. Which of the two will appear to be more cold and why ?
(d) Explain why, the warm drink bottles could be cooled more quickly by placing them in a tub of crushed ice than in a tub of ice cold water.
(e) Can you suggest another way in which the warm soft drinks can be cooled even more quickly by using ice (than by keeping the bottles in crushed ice) ?
(f) What type of change of state takes place when ice is used for cooling purposes ? What is the special name of this change of state ?
(g) What values are displayed by Rakesh in the episode ?

Explanation

(a) The temperature of water formed from the freshly melted ice is `0^(@)C`
(b) The temperature of melting ice is also `0^(@)C`
(c) The piece of ice held on the right hand palm will appear to be more cold to the person. This is because when the piece of ice held on the right hand palm starts melting, it takes the latent heat (required for melting) from the right hand palm of the person. The right hand palm loses more heat to the melting ice and hence the person feels it to be more cold. The ice cold water held in the left hand palm, however, cannot take away any latent heat (because no change in state is involved).
(d) The warm soft drink bottles can be cooled more quickly by placed in crushed ice because, when the ice melts, it will take the latent heat required for melting from the soft drink bottles and the liquid contained in them. And by losing this heat, the warm soft drink bottles and the liquid contained in them. And by losing this heat, the warm soft drink bottles will get colled more quickly. But ice cold water cannot take away any latent heat of melting from warm solf drink bottles
(e) The warm solt drinks can be colled even more quickly by opening the bottles, pouring the soft drinks in jugs and placing pieces of ice in them
(f) When ice is used for cooling purposes, it melts to form water. So, the change of state is from solid to liquid. The special name of this change of state is fusion (of ice)
(g) The values displayed by Rakesh in this episode are (i) Knowledge of latent heat of fusion of ice (ii) Application of knowledge in solving everyday problems, and (iii) Desire to prevent embarrassment to his friend's family.