Assertion Reason:
Statement -1 : Molality of pure ethanol is lesser than pure water.
Statement -2 : As density of ethanol is lesser than density of water.
[Given : dethanol = 0.789 gm/ml; dwater = 1 gm/ml]
(A) Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.
(B) Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.
(C) Statement-1 is false, statement-2 is true.
(D) Statement-1 is true, statement-2 is false.
Answers
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ANSWER:
- (B) Statement - 1 is true, statement - 2 is true and statement - 2 is not the correct explanation for statement - 1.
GIVEN:
- Statement - 1 : Molality of pure ethanol is lesser than pure water.
- Statement - 2 : As density of ethanol is lesser than density of water.
TO VERIFY:
- The given statements.
EXPLANATION:
REASON:
- Eventhough density is smaller for ethanol, molecular mass influences greatly the molality of ethanol and water.
- Because difference between molecular masses of ethanol are much greater when compared to difference between densities.
- Also generally, density is not used to calculate the molality.
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