Write the observations and balanced equations for the following reactions :

Sodium hydroxide is added drop-wise till in excess to a solution of zinc sulphate.

Q. Sodium hydroxide is added drop wise till in excess to a solution of Zinc sulphate. Which of the following observation can be made?

Q. Write the observations, and balanced equations for the following reactions:
(i) Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.
(ii) Ammonium hydroxide is added first in a small quantity, and then in excess, to a solution of copper sulphate.
(iii) Excess of ammonium hydroxide is added to a substance, obtained by adding hydrochloric acid to silver nitrate solution.
(iv) Moist starch iodide paper is placed at the mouth of a test-tube containing chlorine gas.
(v) A paper dipped in potassium permanganate solution is placed at the mouth of a test-tube, containing sulphur dioxide gas.

Q. State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions :
(i) copper sulphate solution.
(ii) zinc sulphate solution.

Q. What do you see when sodium hydroxide solution is added to zinc sulphate, till it is in excess?