Chemistry
A mineral from which the metal can be extracted economically and conveniently is known as:
- Matrix
- Ore
- Flux
- Alloy
Related Questions
Which of the following would occupy 22.4 litres at S.T.P.?
(1) 32g of oxygen gas
(2) 2 moles of hydrogen gas
(3) 6.022 x 1023 molecules of ammonia
- 1 & 2
- 1 & 3
- 2 & 3
- 1, 2 & 3
[Atomic weights: O = 16, H = 1, N = 14]
In the molecule of water, oxygen atom has:
- One shared pair of electrons.
- Three shared pairs of electrons.
- Two lone pairs of electrons.
- One lone pair of electrons
The following sketch represents the electroplating of an Iron cup with Nickel metal. Study the diagram and answer the following questions:
(a) During electroplating the iron cup is placed at the cathode. Why?
(b) Name the ion that must be present in the electrolyte.
(c) State one condition that is necessary to ensure that the deposit is smooth, firm and even.
(d) Write the reaction taking place at the cathode.
(e) What change would you observe at the anode?
Match the Column A with Column B:
Column A Column B (a) Water 1. Lithium (b) Alkali metal 2. Iodine (c) Halogen 3. Covalent compound (d) Calcium oxide 4. Acetic acid (e) Weak acid 5. Ionic compound 6. Sulphuric acid