Advertisements
Advertisements
प्रश्न
Give reason for the following:
The percentage of oxygen, in air dissolved in water, is higher than the percentage of oxygen in ordinary air.
Advertisements
उत्तर
Oxygen dissolves in water and in air there are some other gases also which make the bulk of air. Some gases dissolve in water.
APPEARS IN
संबंधित प्रश्न
Match the statements in column A with that in column B.
| Column A | Column B |
| (a) deliquescent substance | (1) sodium bicarbonate |
| (b) hygroscopic substance | (2) magnesium chloride |
| (c) efflorestance substance | (3) conc. sulphuric acid |
| (d) substance causing temporary hardness | (4) washing soda |
Name a ‘pure form’ and an,‘impure form’ of water in the natural state.
Select the correct answer of the following statement:
A solution which can pass through a filter paper but not through a semipermeable membrane.
Give a balanced equation for the following conversion:
Potassium oxide to a strong alkali.
Explain why oil spills have an adverse effect on marine life.
Give the influence of pressure.
Name or state the following:
A deliquescent salt of a trivalent metal.
Pick from the following one chemical used to disinfect water.
In a filtration, plant water is filtered using layers of
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
