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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

 

Common edible salt, NaCl (Sodium Chloride) obtained from seawater or from lakes contains many impurities such as sulphates of sodium and magnesium along with chlorides of calcium and magnesium. The chlorides of these metals are particularly undesirable being deliquescent in nature.

A saturated solution of salt in a minimum quantity of water is prepared and insoluble impurities are filtered off. HCl gas is then passed through the saturated solution and the crystals of pure NaCl separate out. The soluble impurities remain in the solution. Pure crystals of NaCl are filtered, washed, and dried.

 

(v) Examine few statements regarding NaCl:

I. It is prepared by Chlor-alkali process
II. It is a white crystalline substance
III. It also exists in the form of rocks called rock salt
IV. It is a neutral salt with a pH value = 7
1 II and III only  
2 III and IV only  
3 I and IV only  
4 II, III and IV only  

Ans.

(4)