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Change of State

Ice at -50∘C ...

Question

Ice at - $50^{\circ}$ C is heated until all of it is converted into water vapour at $110^{\circ}$ C. If the temperature and time graph is plotted for the experiment, how many times will the slope of the graph become zero?

A

0

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B

1

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C

2

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D

3

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Solution

The correct option is C 2

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Similar questions

Q. The graph shows the values of temperature, when ice is heated till it becomes water vapour. Observe the graph and answer the following questions. (Note that the figure is not completely quantitative and also not to the scale. It is purely qualitative)
(a) At what temperature, ice converts into water ?
(b) What does

¯ ¯¯¯¯¯¯¯ ¯ D E

represent ?
(c) What is the range of temperature of liquid water ?
(d) Which part of the graph represents change of state from ice to water ?

Q. Heat energy is supplied at a constant rate to

100 g

0^{\circ} C

. The ice is converted into water at

0^{\circ} C

2

minutes. How much time will be required to raised the temperature of water from

0^{\circ} C

20^{\circ} C

? [Given: specific heat capacity of water

= 4.2 J g^{- 1}^{\circ} C^{- 1}

, specific latent heat of ice

= 336 J g^{- 1}]

Q. Question 68(iii)
The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions.

After how many seconds of heating did the temperature become constant at

100^{\circ} C

Q. The following line graph shows the change in temperature of a block of ice when heated.

Study the above graph carefully and answer the questions given below:
(i) For how many seconds did the ice block have no change in temperature?

(ii) For how long was there a change in temperature?

(iii) After how many seconds of heating did the temperature become constant at 100° C?

(iv) What was the temperature after 25 seconds?

(v) What will be the temperature after 1.5 minutes? Justify your answer.

Q. Question 68(iii)
The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions.

After how many seconds of heating did the temperature become constant at

100^{\circ} C

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