Chemistry
Match the following Column A with Column B.
| Column A | Column B |
|---|---|
| Aluminium | Covalent compound |
| Sulphuric acid | Carbonate ore |
| Calcination | Hall Heroult’s process |
| Calcium Chloride | Contact Process |
| Carbon tetrachloride | Electrovalent compound |
Metallurgy
ICSE Sp 2025
17 Likes
Answer
The matched columns are shown below:
| Column A | Column B |
|---|---|
| Aluminium | Hall Heroult’s process |
| Sulphuric acid | Contact Process |
| Calcination | Carbonate ore |
| Calcium Chloride | Electrovalent compound |
| Carbon tetrachloride | Covalent compound |
Answered By
14 Likes
Related Questions
A student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes:
- (I) and (II)
- (I) and (III)
- (II) and (III)
- (II) and (IV)
Electroplating steel objects with silver involves a three-step process.
Step 1 — A coating of copper is applied to the object.
Step 2 — A coating of nickel is applied to the object.
Step 3 — The coating of silver is applied to the object.
(a) A diagram of the apparatus used for step 1 is shown.

The chemical process taking place on the surface of the object is
Cu2+(aq) + 2e- ⟶ Cu (s)
What is the observation seen on the surface of the object?Explain why the concentration of copper ions in the electrolyte remains constant throughout step 1.
(b) Give two changes which would be needed in order to coat nickel onto the object in step 2.
(c) Write down the reaction taking place at the positive electrode during step 3.
Complete the following by choosing the correct answers from the bracket:
(a) If an element has one electron in the outermost shell, then it is likely to have the …………… [smallest/largest] atomic size amongst all the elements in the same period.
(b) …………… [sulphuric acid/hydrochloric acid] does not form an acid salt.
(c) A …………… [reddish brown/dirty green] coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.
(d) Alkynes undergo …………… [addition/substitution] reactions.
(e) An …………… [alkaline/acidic] solution will turn methyl orange solution pink or red.
Identify the following:
(a) A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.
(b) A salt formed by the complete neutralization of an acid by a base.
(c) A reaction in which the hydrogen of an alkane is replaced by a halogen.
(d) The energy required to remove an electron from a neutral gaseous atom.
(e) A homogenous mixture of two or more metals or a metal and a non-metal in a definite proportion in their molten state.