Two elements A and B form compounds having formula AB 2 and AB 4 . When dissolved in 20 g of benzene (C 6 H 6 ), 1 g of AB 2 lowers the freezing point by 2.3 K whereas 1.0 g of AB 4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol –1 . Calculate atomic masses of A and B.

Question

Two elements A and B form compounds having formula AB 2 and AB 4 . When dissolved in 20 g of benzene (C 6 H 6 ), 1 g of AB 2 lowers the freezing point by 2.3 K whereas 1.0 g of AB 4 lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol –1 . Calculate atomic masses of A and B., A = 34.25 u and B = 42.64 u, A = 25.58 u and B = 42.64 u, A = 25.58 u and B = 78.36 u, A = 34.25 u and B = 78.36 u

MARKS App · Accepted Answer

Correct Option is : (B) A = 25.58 u and B = 42.64 u

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