Which solution has the lowest freezing point?
(1) 10. g of ki dissolved in 100. g of water
(2) 20. g of ki dissolved in 200. g of water
(3) 30. g of ki dissolved in 100. g of water
(4) 40. g of ki dissolved in 200. g of water

(3) 30 g of KI dissolved in 100 g of water

Explanation: Formula used for lowering in freezing point is,

or,

where,

= change in freezing point

= freezing point constant

m = molality

1) 10 g of KI dissolved in 100 g of water:

2) 20 g of KI dissolved in 200 g of water

3) 30 g of KI dissolved in 100 g of water

As the depression is maximum, the solution will have lowest freezing point.

4)  40 g of KI dissolved in 200 g of water

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

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