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Q.

The density of water at 20°C is 998 kg/m3 and that at 40°C is 992 kg/m3. The coefficient of cubical expansion of water is

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a

0.6 x 10-4/°C

b

0.4 x 10-4/°C

c

none of these

d

0.2 x  10-4/°C

answer is D.

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Detailed Solution

ρ0=ρ(1+γt)  998=992(1+γ×20) γ=620×992=6×1041.9840/C

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The density of water at 20°C is 998 kg/m3 and that at 40°C is 992 kg/m3. The coefficient of cubical expansion of water is