Two elements A and B form compounds of formula AB2 and AB4. When dissolved in 20.0 g of benzene 1.0 g of AB2 lowers f. pt. by 2.3℃ whereas 1.0 g of AB4 lowers f. pt. by 1.3℃. The Kf for benzene is 5.1. The atomic masses of A and B are

Two elements A and B form compounds of formula AB2 and AB4. When diss

1.	Two elements A and B form compounds of formula AB2 and AB4. When dissolved in 20.0 g of benzene 1.0 g of AB2 lowers f. pt. by 2.3℃ whereas 1.0 g of AB4 lowers f. pt. by 1.3℃. The Kf for benzene is 5.1. The atomic masses of A and B are
A.	25, 42
B.	42, 25
C.	52, 48
D.	48, 52
Answer» B. 42, 25