Analytical Chemistry Uses of Ammonium Hydroxide and Sodium Hydroxide — Chemistry STD 10 — Question

Give balanced reactions for the following conversion:
Ammonia solution to an amphoteric hydroxide.

Name the acids present in vinegar, grapes and lemon.

With reference to the nature of electrodes - name three active and three inert electrodes.

Write three uses of ethyne.

What is the difference between:
Electrolytic dissociation and thermal dissociation.

One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state no visible reaction.
Calcium nitrate solution and zinc nitrate solution.

Give appropriate scientific reasons for the following statement :
Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be reduced by a reducing agent.

A to F below relate to the source and extraction of either zinc or aluminium.
A. Bauxite
B. Coke
C. Cryolite
D. Froth floatation
E. Sodium hydroxide solution
F. Zinc blende
Write down the three letters each from the above list which are relevant to:
(i) Zinc
(ii) Aluminium

In order to obtain 1 tonne of aluminium the following inputs are required. 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite
♦ when bauxite is treated with sodium hydroxide solution, what happens to
(i) the aluminium oxide
(ii) the iron (III) oxide