Question : Which of the following pair of compound name – formulas is correct?
I. Calcium oxide – CaO
II. Aluminium oxide – Al2O3
| Calcium oxide | CaO |
| Aluminium oxide | Al2O3 |
Option 1: Only I
Option 2: Both I and II
Option 3: Neither I nor II
Option 4: Only II
Correct Answer: Both I and II
Solution : The correct answer is Both I and II.
- Aluminium oxide . Two aluminium atoms and three oxygen atoms make up aluminium oxide. Al 2 O 3 is the chemical formula for aluminium oxide. It exists in nature as corundum and alumina. Not soluble in water.
- Calcium oxide (CaO) is a widely used chemical compound that is also referred to as quicklime or burnt lime.
Related Questions
Question : Match the gases in column I with their odour in column II.
| Column I | Column II | ||
| A. | CO2 | 1. | Colourless gas with the smell of rotten eggs |
| B. | H2S | 2. | A colourless, odourless gas |
| C. | SO2 | 3. | Colourless gas with a pungent smell |
Option 1: A – 1, B – 2, C – 3
Option 2: A – 2, B – 1, C – 3
Option 3: A – 2, B – 3, C – 1
Option 4: A – 3, B – 1, C – 2
Question : Match List I and List II and mark the correct answer.
| List I | List II |
| a. Chinook | 1. Alps |
| b. Foehn | 2. India |
| c. Sirocco | 3. USA |
| d Loo | 4. Egypt |
Option 1: a-4, b-2, c-1, d-3
Option 2: a-3, b-4, c-2, d-1
Option 3: a-3, b-1, c-4, d-2
Option 4: a-4, b-3, c-1, d-2
Question : Match of the following.
| Nature | Substances |
| 1. Acidic | a. Distilled water |
| 2. Basic | b. Carbonated drink |
| 3. Neutral | c. Soap |
Option 1: 1 - a, 2 - c, 3 - b
Option 2: 1 - b, 2 - c, 3 - a
Option 3: 1 - a, 2 - b, 3 - c
Option 4: 1 - c, 2 - a, 3 - b
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