`0.002m` aqueous solution of an ionic compound `Co(NH_(3))_(5)(NO_(2))CI` freezes at `-0.00732^(@)C`.Number of moles of ions which 1 mole of ionic compound produces 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 produced by 1 mole of ionic comppound.
` Delta T _(f) = ik_(f) m, I = Delta T_(f)//K_(f) m`
`Delta T_(f) = 0 - (- 0.00732)`
` = 0.00732^(@)`
`k_(f) = 1.86^(@)C//m`
m = 0.0020
` I = (0.00732)/(1.86 xx 0.0020)`
` = 1.968 ~~ 2`