Chapter 5
Exploring Mixtures and their Separation
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

Refer to the solubility curves given in the graph provided below. If equal masses of hot, saturated solutions of compounds 'A' and 'B' are cooled from 80 °C to 60 °C, which solution is likely to deposit more solid? [Pg. No. 79]

Question image

Answer: Verified

Compound B solution is likely to deposit more solid.

From the graph, when the temperature is lowered from 80 °C to 60 °C, the solubility of compound B decreases much more sharply than that of compound A. Compound A shows only a small decrease in solubility, so only a small amount of solid will separate out. Since a hot saturated solution contains the maximum solute at 80 °C, cooling reduces its solubility, and the excess solute crystallises out. Therefore, the saturated solution of compound B will deposit more solid on cooling.

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More NCERT Questions
State whether the following statements are True or False. Also, correct the False statements. (A) Salt can be separated from a salt solution by evaporation or distillation. (B) Distillation can be use Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option. (a) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm (b) Brass — Ht, Is sublimation different from evaporation? Justify. [Pg. No. 84] Why do immiscible liquids form two separate layers in a separating funnel? [Pg. No. 84]