Chemistry
Complete the following sentences by choosing the correct answer from the brackets:
(a) The salt that can be prepared by Direct Combination is …………… . [FeCl3 / FeCl2]
(b) The metallic oxide which can be reduced by using common reducing agents is …………… . [Fe2O3 / Al2O3]
(c) The metal nitrate which on thermal decomposition forms a black residue is …………… . [zinc nitrate / copper nitrate]
(d) During the electrolysis of copper sulphate solution, if …………… is used as electrodes, the colour of the electrolyte does not fade. [copper / platinum]
(e) The process of heating the concentrated ore in a limited supply or absence of air is …………… . [roasting / calcination]
Answer
(a) The salt that can be prepared by Direct Combination is FeCl3 .
(b) The metallic oxide which can be reduced by using common reducing agents is Fe2O3 .
(c) The metal nitrate which on thermal decomposition forms a black residue is copper nitrate .
(d) During the electrolysis of copper sulphate solution, if copper is used as electrodes, the colour of the electrolyte does not fade.
(e) The process of heating the concentrated ore in a limited supply or absence of air is calcination .
Related Questions
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 State the terms for the following:
(a) The group obtained by removing one hydrogen atom from the parent alkane.
(b) Two metal plates or wires through which the current enters and leaves the electrolytic cell.
(c) The amount of substance which contains the same number of units as the number of atoms in carbon-12.
(d) The tendency of an atom to pull a shared pair of electrons towards itself in a compound.
(e) The formula which represents the simplest ratio between the atoms of elements present in a compound.
(a) Give the IUPAC names of the organic compounds represented by the structural formulae given below:
(b) Draw the structural diagram for the following organic compounds:
- 3-methyl pentane
- propyne
- methanal