A 0.0020 m aqueous solution of an ionic compound `[CO(NH_3)_5 (NO_2)]CI` freezes at -0.00732 `""^@C`. Number of moles of ions in which I mol of ionic compound produces on being dissolved in water will be `(K_f = -1.86^@C//m)`

Options

A. 3
B. 4
C. 1
D. 2

Answer

D

Explanation

The number of moles of ions produced by 1 mole of ionic compound = I
Applying, `DeltaT_f = ixx K_f xxm`
`0.00732=ixx1.86xx0.002 implies (0.00732)/(1.86 xx 0.002) = 1.96~~2`