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Solution


Q.

‘x’ g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1°C to 25°C. Which out of the following plots, is best suited for the change in the molarity (M) of the solution with respect to temperature

[Consider the solubility of NaCl remains unchanged over the temperature range]             [2025]
1  
2  
3  
4  

Ans.

(2)

Density of water is maximum at 4°C. This is because from 0°C to 4°C, hydrogen bonds break and molecules come closer. After 4°C volume increases due to thermal expansion. Thus from 1°C to 4°C, volume of solution decreases and hence molarity increases. Heating the solution beyond 4°C increases its volume hence the molarity decreases.