a.

The atomic number

b.

The Avogadro number

c.

The gas constant

d.

The number of electrons

a.

be zero

b.

reduce

c.

increase

d.

be stable

a.

Its vapour pressure is equal to the vapour pressure of its solid at the given temperature

b.

Molecules start escaping from its surface

c.

Its vapour pressure equals the atmospheric pressure

d.

Its volume is slightly increased

a.

Butane gas flame

b.

Acetylene flame

c.

Kerosene flame

d.

Oxy-acetylene flame