State whether the statements given below are True [T] or False [F]. Correct the false statement(s).
Oxygen gas is more soluble in hot water rather than in cold water.
False. Oxygen gas is more soluble in cold water than in hot water. The solubility of gases generally decreases as temperature increases.
A mixture of sand and water is a solution.
False. A mixture of sand and water is a non-uniform mixture, not a solution. In a solution, the components are evenly distributed throughout.
The amount of space occupied by any object is called its mass.
False. The amount of space occupied by any object is called its volume. Mass is the quantity of matter present in an object.
An unsaturated solution has more solute dissolved than a saturated solution.
False. An unsaturated solution has less solute dissolved than a saturated solution. A saturated solution contains the maximum amount of solute that can dissolve at that temperature.
The mixture of different gases in the atmosphere is also a solution.
True. Air is a gaseous solution where nitrogen acts as the solvent and other gases like oxygen, argon, and carbon dioxide act as solutes.
Explanation
(i) The chapter explains in Section 9.3 that 'the solubility of gases generally decreases as temperature increases. More oxygen can dissolve in cold water, ensuring sufficient oxygen for aquatic life.' (ii) The chapter states on Page 2 that 'when chalk powder or sand, or sawdust is mixed with water, the components are not evenly distributed. Such mixtures are known as non-uniform mixtures.' A solution requires uniform distribution of components. (iii) The chapter defines mass as 'the quantity of matter present in any object' (Page 8) and volume as 'the space occupied by an object' (Page 10). (iv) The chapter defines an unsaturated solution as one 'in which more solute can be dissolved at a given temperature' and a saturated solution as one where 'no more of it can be dissolved at that temperature' (Page 4). (v) The chapter explicitly states on Page 2 that 'Air is a gaseous solution. Since nitrogen is present in the largest amount in the air, it is considered as the solvent, while oxygen, argon, carbon dioxide, and other gases are considered as solutes.'