Nitrogen, oxygen, helium, carbon dioxide and water vapour are the components of air. Arrange the properties given below in the order of gases given above.
(A) Colourless, odourless gas, acidic in nature, and neither combustible nor a supporter of combustion
(B) Colourless, odourless gas, inert in nature, and dilutes the activity of active component of air
Colourless gas and forms acidic and basic compounds with non-metals and metals, respectively
(D) Colourless gas, inert in nature, and present in trace amounts
(E) Gaseous form, present in variable amounts, and chemically active along with the active component of air

Options

A. BCDAE
B. DAECB
C. BCADE
D. DEABC

Explanation

To solve the problem, we need to match the properties of the gases with the correct components of air. The components of air we are given are nitrogen, oxygen, helium, carbon dioxide, and water vapor. Let's analyze each property step by step.

### Step 1: Identify the properties and their corresponding gases

1. **(A)** Colourless, odourless gas, acidic in nature, and neither combustible nor a supporter of combustion.
- This description matches **Carbon Dioxide (CO2)**. CO2 is known to be acidic (it forms carbonic acid in water) and does not support combustion.

2. **(B)** Colourless, odourless gas, inert in nature, and dilutes the activity of the active component of air.
- This description matches **Nitrogen (N2)**. Nitrogen is an inert gas that makes up a large portion of the atmosphere and dilutes the concentration of oxygen.

3. **(C)** Colourless gas and forms acidic and basic compounds with non-metals and metals, respectively.
- This description matches **Oxygen (O2)**. Oxygen can react with metals to form basic oxides and with non-metals to form acidic oxides.

4. **(D)** Colourless gas, inert in nature, and present in trace amounts.
- This description matches **Helium (He)**. Helium is an inert gas and is present in very small amounts in the atmosphere.

5. **(E)** Gaseous form, present in variable amounts, and chemically active along with the active component of air.
- This description matches **Water Vapour (H2O)**. Water vapor is present in varying amounts in the atmosphere and is chemically active.

### Step 2: Arrange the gases based on the properties

Now we can arrange the gases in the order of the properties given:

- **(B)** - Nitrogen (N2)
- **(C)** - Oxygen (O2)
- **(D)** - Helium (He)
- **(A)** - Carbon Dioxide (CO2)
- **(E)** - Water Vapour (H2O)

### Final Order
The final order of the gases based on the properties is:
1. Nitrogen (N2) - B
2. Oxygen (O2) - C
3. Helium (He) - D
4. Carbon Dioxide (CO2) - A
5. Water Vapour (H2O) - E