Question

a.Why common salt becomes sticky during rainy season? (1.5 marks)
b. Why blue vitriol changes to white upon heating? (1.5 marks)​

Answer 1

Answer:

a. because of humidity

b. because water of crystallization vaporizes

Explanation:

a. Why because of humidity?

The highly humid whether during rainy seasons cause water to forcibly condense around common salt due to which it seems sticky

b. What is water of crystallization now?

Water of crystallization is present in various salts (which is also called a hydrated salt) Here in blue vitriol (Copper Sulphate) contains water of crystallization molecules which reflect blue light but when heated blue vitriol looses water of crystallization and appears white.

it is the formula and process of heating of blue vitriol::

CuSO4 . 10H2O (blue vitriol) ----- heat ----- CuSO4 (White Vitriol) + 10H2O

Answer 2

Answer:

1)common salt become sticky during the rainy season because it contains impurity of magnesium chloride (MgCl2) which is of deliquescent nature. when exposed to atmosphere,it becomes moist. Therefore,comon salt becomes sticky during the rainy season.

2)blue vitriol is hydrated copper sulphate meaning CuSO4,when blue vitriol is heated,those water of crystallization escape out of the crystal and what's left is anhydrous copper sulphate CuSO4, without any water of crystallization.

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