Question

2010
(a) Select the correct answer from A, B, C, D and E
A. Nitroso iron [II] sulphate
B. Iron (III) chloride
C. Chromium sulphate
D. Lead chloride
E. Sodium chloride
(i) A deliquescent compound
(ii) A compound soluble in hot water but
insoluble in cold water
(iii) A compound which in the aqueous solution
state, is neutral in nature.​

Answer 1

E: sodium chloride is your ans

Answer 2

The correct example of each is given below.

Explanation:

• i (A deliquescent compound) - B ( Iron(III) Chloride)
• ii ( Compound soluble in hot water but insoluble in cold water )- D ( Lead Chloride)
• iii ( compound whose aqueous solution is neutral )- E ( Sodium chloride)
• Iron chloride or ferric chloride is an example of a deliquescent compound. The deliquescent compounds are those that absorb moisture and have high chemical affinity towards water when exposed to the environment thereby forming a liquid.
• Lead chloride is insoluble in cold water. According to hard-soft acid-base theory,  lead ion is a borderline acid. Water on the other hand is a hard solvent. Hard-hard and soft-soft interactions are much more favorable as compared to mixed interactions. Hot water on the other hand  weakens the lead ion- anion bonds making lead chloride soluble in hot water.
• Sodium chloride , $NaCl$ when dissolved in water breaks up to give hydroxide and hydrogen ions which are equal in number. This makes the aqueous solution of $NaCl$ neutral.