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प्रश्न
State the method used for collecting the following gas-
Ammonia – a gas highly soluble in water and lighter than air
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उत्तर
The method used for collecting ammonia gas is the downward displacement of air. This method is used for gases like ammonia which is soluble in water and lighter than air.
संबंधित प्रश्न
What is the main difference between alchemy and chemistry?
Choose the correct alternative from the choices given below for the following statement:
Which one of the following is a pesticide?
Match the following scientists in column A with their discoveries or contributions in column B.
| Column A | Column B | ||
| (a) | Marie Curie | (i) | Safety Lamp |
| (b) | John dalton | (ii) | Helium |
| (c) | William Ramsey | (iii) | Nobel Prize Winner (two times) |
| (d) | Sir Humphry Davy | (iv) | Atomic Theory |
State why a round bottom flask is preferred to a flat bottom flask – during the preparation of gases in the laboratory.
State the method used for collecting the following gas:
Sulphur dioxide – a gas highly soluble in water and heavier than air
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
For gas preparations where heating is required.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A long glass tube with a broad inlet at the top, which allows entry of the reactants into the round bottom flask, during laboratory preparations of gases.
Select the correct apparatus from A, B, or C for the following functions of the apparatus given.
A modern apparatus with an air regulator, used for heating purposes.
Give reasons for the following
Alchemy was considered a pseudoscience.
A philosopher’s stone is not exactly a stone.
