Water — CHEMISTRY STD 6 — Question

round-bottom flask is used to store chemicals.

Some metals exist as gases.

The percentage of carbon dioxide in the air is between 0.2 to 0.4%.

Burning of a candle involves both physical and chemical changes.

The occurrence of tide is a man-made change.

A solvent or detergent is generally used to remove stain.

A gas has a definite volume, but no definite shape.

If ‘X’ g. of solute is added to 100 g. of water at t°C and the solution formed is a saturated solution, then ‘X’ g. is the solubility of the solute.

Gunpowder is an insecticide:

Air is a mixture and not a compound since the components of air cannot be separated by physical methods.