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Q)

# The pH of pure water at $80^\circ C$ will be

(a) > 7

(b) < 7

(c) = 7

(d)  cannot be predicted.

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A)
The value of $K_w$ increases with rise in temperature because dissociation of water is endothermic.
$\therefore$ The value of pH of natural water decreases with rise in temperature.
Hence pH of water at $80^{\circ}$ is < 7.