States (Phase) of Alkanes

Q.

Both ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2$ gases are?

1. heavier than air

2. colorless

3. acidic in nature

4. soluble in water

Q.

Which of these is an odourless and colourless gas?

1. Methane

2. Syncrude

3. Ozone

4. Octane

Q. Is the product formed on burning sulphur acidic or basic?
Explain

Q.

Write two physical properties of carbon monoxide.

Q. (a) How is methane gas prepared in laboratory?
(b) How is the gas collected?
(c) Why is sodalime used not only NaOH?

Q. Match the following alkanes with their physical state of existence at room temperature.

1. Solid
2. Liquid
3. Gas

Q.

The physical state of alkanes upto butane at ordinary temperature are in ___ state.

1. solid

2. gaseous

3. amorphic

4. liquid

Q. Acetylene is thermodynamically unstable and readily explodes, therefore it is stored in commercial cylinders used for an oxy-acetylene torch for welding. These cylinders contain:

1. charcoal powder saturated with acetone
2. pumice stone saturated with acetone
3. dissolved in tupentine oil
4. dissolved in water to give 0.5 M solution

Q. Match the following alkanes with their physical state of existence at room temperature.

1. Solid
2. Liquid
3. Gas

Q.

why we can not keep petrol in anu glass vessel or container