Q.

A) Molality B) Mole fraction C) Lowering of Vapour pressure (LVP)D) Relative lowering of vapour pressure (RLVP) From the above list identify the property which is influenced by temperature

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LVP only

LVP and RLVP only

Molality and LVP only

None of these are influenced by temperature.

answer is A.

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Detailed Solution

1 Molality = nsoluteWsolventkg2 M.F =ni∑ni(1) & (2) do not involve “volume” term. Both of them do not vary with change in temperature.As temperature increases, p0 and p both increases. Increase in p0>p.∴ LVP p0 − p also increasesLVP also varies with temperature.(4) RLVP is independent of temperature because it is equal to mole fraction.

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