(A) :Vapour pressure of 0.5M sugar solution is more than 0.5M KCl solution.
(R) :Lowering of vapour pressure is directly proportional to the number of particles present in the solution.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is A.

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Detailed Solution

Sugar being a covalent compound has formula $C_{12} H_{22} O_{11}$ where as $KCl$ is an ionic compound.
Since, Relative lowering of vapor pressure (RLVP) is literature driven colligative property, thus it increases with the increase in species present in solution.
Here, $KCl$ dissociated into K⁺ and Cl^-thus forming two ions in solution and having higher species in solution compared to sugar, thus RLVP_sugar>RLVP_KCl.
Hence, correct option is: (A) Both (A) and (R) are true and (R) is the correct explanation of (A)