<h2>Question no 1:</h2><h3>Answer:</h3>
The correct answer is option A which is temperature and the nature of solute and solvent
<h3>Explanation:</h3>
- The solubility of a substance is its ability to dissolve in a particular solution.
- Solubility is highly dependent on the temperature and nature of solute and solvent.
- It is directly proportional to the temperature. As we increase the temperature, the solubility of substantial increases but for the exothermic reactions, solubility is inversely proportional to temperature.
- Solubility is absolutely dependent on the nature of solute and solvent, as polar solute and solvents have high solubility than non polar.
<h2>Question no. 2</h2><h3>Answer:</h3>
The correct answer is option B which is a large amount of solute.
<h3>Explanation:</h3>
- A concentrated solution contains the maximum amount of solute which can be dissolved in the solvent.
- For example, in water sugar solution concentrated solution will contain a large amount of sugar dissolved in water without the addition of heat.
- In dilute solution, there is a small amount of solute.
<h2>Question no. 3:</h2><h3>Answer:</h3>
The correct answer is option B which is molarity × liters of solution.
<h3>Explanation:</h3>
Molarity of a solution is the total number of moles of solute per unit volume of solution.
Its formula is:
Molarity = Number of moles of the solute/volume of solution in liters.
A number of moles of solute = Molarity × Volume of the solution.
So the number of moles of solute is equal to the molarity and volume of solution. Hence correct option is B.
<h2>Question no 4.</h2><h3>Answer:</h3>
The correct answer is option D. Molarity of the dilute solution = 0.81 M
<h3>Explanation:</h3>
Given data:
initial volume = V1 = 225 mL = 0.225 L
Initial molarity = M1 = 0.80M
Final volume = V2 = 1 L
Final molarity = M2 = ?
Solution:
It is the dilution of the stock solution and the formula is given below:
V1M1 = V2M2
M2 = V1.M1/V2
By putting values in the formula:
M2 = 0.225 × 0.8/1
M2= 0.18
So the final molarity of the solution will be 0.18 M. Hence the correct answer is option D.
<h2>Question no. 5</h2><h3>Answer:</h3>
The correct answer is option B which is supersaturation.
<h3>Explanation:</h3>
- Colligative properties of the solution are the properties which are not dependent on the number of particles of the solute in the solution.
- While supersaturation of the solution means the solution containing the highest number of solute particles dissolved in the solution.
- Since supersaturation is dependent on a number of solutes, it is not a colligative property.
<h2>Question no 6.</h2><h3>Answer:</h3>
The correct answer is option B/C, "which disrupts crystal formation of the solvent".
<h3>Explanation:</h3>
- Depression of freezing point is the colligative property of the solution.
- Which the lowering of the freezing point of a solution by adding the solute.
- The addition of solute disrupts the crystal formation in the solvent, as it disrupts the intermolecular forces between solute particles.
- Hence option B and C are the correct options because both have the same statement.
<h2>Question no 7.</h2><h3>Answer:</h3>
The correct answer is option D which is 142.
<h3>Explanation:</h3>
<u>Given data:</u>
Volume of solution = 167 ml
Percentage of solution = 85%
The volume of alcohol =?
<u>Solution:</u>
Percentage of solution ( v/v) = volume of solute/volume of solution × 100
The volume of solute = percentage × volume of solution/100
By putting values in above formula:
Volume of alcohol = 85 × 167/100 = 141.95 ml
<em><u>Hence the correct answer is option D which is approximately 142(141.95).</u></em>
