Question 12 Marks
What happens when blue vitriol is heated? Explain.
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Question 22 Marks
Why bubbling occurs when water is boiled?
Answer
View full question & answer→The solubility of a gas in liquid decrease with increase in temperature. Generally, water contains dissolved oxygen. When water is boiled, the solubility of oxygen in water decreases, so oxygen escapes in the form of bubbles.
Question 32 Marks
Where we use the phrase – “Like dissolves Like” and explain the meaning of the phrase?
Answer
View full question & answer→The phrase “like dissolves like” is often used for predicting solubility. This expression means that dissolving occurs when similarities exist between the solvent and the solute. For example, Common salt is a polar compound and dissolves readily in polar solvent like water.
Question 42 Marks
Observe the diagram.
- Which is a concentrated solution and why?
- Which is dilute solution and why?
Answer
View full question & answer→- Flask (b) is a concentrated solution. Because (b) flask contains a large number of solute particles than (a) flask.
- Flask (a) is a dilute solution. Because (a) flask contains a lesser number of solute particles than (b) flask.