Heat is required to change 1 kg of ice at 20oC into steam. Q1 is the heat needed to warm the ice from -20oC to 0oC, Q2 is the heat needed to melt the ice, Q3 is the heat needed to warm the water from 0oC to 100oC and Q4 is the heat needed to vapourize the water. Then

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Q4>Q3>Q2>Q1

Q4>Q3>Q1>Q2

Q4>Q2>Q3>Q1

Q4>Q2>Q1>Q3

answer is A.

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Detailed Solution

Q4=mLw=m540calQ3=msw(100−0)=m100calQ2=mLice=80calQ1=msice (20−0)= m 10calQ4>Q3>Q2>Q1

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