x% (w/v) solution of urea is isotonic with 4% (w/v) solution of non-volatile solute of molar mass 120 g mol-1. The value of x is
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3
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Official Solution
Correct Option: (1)
(urea molar mass = 60, given solute = 120)
02
PYQ 2022
medium
chemistryID: ap-eapce
The major product ‘B’ of the following reaction sequence is
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Official Solution
Correct Option: (4)
Reaction Steps: % Option
(A) Treatment of benzyl alcohol with HBr forms benzyl bromide.
% Option
(B) Reaction with alcoholic KOH leads to elimination, forming styrene.
% Option
(C) Hydroboration–oxidation adds OH group anti-Markovnikov giving phenylethanol.
% Option
(D) Final step with NaOH/H O oxidizes alcohol to aldehyde. Thus, major product is benzaldehyde (C H CHO).
03
PYQ 2022
medium
chemistryID: ap-eapce
Assertion (A): Blood cells collapse when suspended in saline water Reason (R): Cell membrane dissolves in saline water
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Both (A) and (R) are correct and R is the correct explanation of A
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Both (A) and (R) are correct, but R is not the correct explanation of A
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(A) is correct but (R) is not correct
4
(A) is incorrect but (R) is correct
Official Solution
Correct Option: (3)
Blood cells collapse in saline due to osmosis. Hypertonic saline causes water to leave the cells, shrinking them. However, the reason given that the membrane dissolves is incorrect. The membrane remains intact but loses water content.
