Tests for gases

The best test for oxygen is that

• it relights a glowing splint

• it relights a burning splint

• it changes lime water to milky

• it makes a glowing splint go out

Carbon dioxide can be tested by using

• a glowing splint

• a burning splint

• hydrogencarbonate indicator

• lime water

Water can be tested by using a piece of dry

• chloride cobalt paper

• coball chloride paper

• cobalt chloride paper

• chlobalt cloride paper

How to test for helium?

• It relights a glowing splint.

• It turns hydrogencarbonate indicator yellow.

• It turns lime water milky.

• There is no simple test for it.

Hydrogencarbonate indicator turns purple in

• air with 0.04% carbon dioxide

• air with less than 0.04% carbon dioxide

• air with more than 0.04% carbon dioxide

• air with no carbon dioxide

Which of the following is the function of carbon dioxide?

• For cutting metals

• For making dry ice

• For filling up balloons

• For filling neon signs