Which of the following salt does not contain the water of crystallization ?

(1) blue vitriol
(2) baking soda
(3) washing soda
(4) gypsum

Which of the following does not form salt with alkali but forms with acid?

(1) BeO
(2) ZnO
(3) CaO
(4) SnO

Strong electrolytes is-

(1) NH₄OH 
(2) Ca(OH)₂
(3) H₂CO₃
(4) NaCl

Acidic solvents are

(1) those who donate proton
(2) accept proton
(3) either can give or accept proton
(4) neither give nor accept proton

Copper sulphate solution is electrolysed with platinum electrodes. Which of the following changes does not occur in the process?

(1) The blue colour of the solution gradually fades 
(2) O₂(g) is liberated at anode 
(3) pH of the solution decreases 
(4) H⁺ concentration decreases