An aqueous solution freezes at - 0.372^@...

An aqueous solution freezes at `- 0.372^@C`. If `K_f` and `K_b` for water are 1.86K kg `"mol"^(-1)` and 0.53 K kg `"mol"^(-1)` respectively, the elevation in boiling point of same solution in K is:

0.72

0.46

4.6

0.106

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