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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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a

LVP only

b

LVP and RLVP only

c

Molality and LVP only

d

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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