Question

Increasing the temperature of an aqueous solution causes (a) decrease in molality (b) decrease in molarity (c) decrease in mole fraction (d) increase in molarity

Answer 1

Increasing the temperature of an aqueous solution causes

(b) decrease in molarity

Molarity is defined as number of moles per litre.

Heating a solution will increase the volume through expansion of the solution.

The molarity will decrease because the number of moles remain the same.

Answer 2

Answer ⇒ (b). Decrease in molarity. 

Explanation ⇒ 
If the temperature of the substances will be increased then the volume of the substances will increase.
Now,
Molarity of the substances inversely proportional to the Volume. 
∴ If the volume will increase then the molarity will decrease.

Molarity = No. of moles of the solute/Volume of the Solutions.  


Hence, Option (b). is correct. 


Hope it helps.