Solutions

Q. Why does red colour appear on clothes with a turmeric stain when we wash them with soap?

Q.

The size of particles in a solution is :

1. Smaller than ${10}^{-7}$ cm

2. Larger than ${10}^{-5}$ cm

3. Between ${10}^{-5}$ and ${10}^{-8}$ cm

4. Smaller than ${10}^{-5}$ cm.

Q.

Tincture of Iodine has antiseptic properties. This solution is made by dissolving

1. Iodine in Potassium Iodide

2. Iodine in Vaseline

3. Iodine in water

4. Iodine in Alcohol

Q.

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar? Does water dissolve an equal amount of salt and sugar? What can be done to dissolve more salt in a saturated solution of water and salt? Name two other things that dissolve in water. [5 MARKS]

Q. When dipped in a soap solution, the colour observed for a turmeric stain would be ______.

Q.

Give five important physical properties of water.

Q. Tincture of iodine has antiseptic properties. This solution is made by dissolving:

1. Iodine in Vaseline
2. Iodine in potassium iodide
3. Iodine in alcohol
4. Iodine in water

Q. A class teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below :

What could be the probable thermometer reading recorded during the experiment?

1. $0^{\circ }C$
2. ${100}^{\circ }C$
3. ${102}^{\circ }C$
4. ${99}^{\circ }C$

Q. Write the scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.

Q.

Which of the following are the properties of a solution?
A: It is a homogeneous mixture.
B: The solute particles are smaller than 1nm in diameter.
C: The solute can be separated by sedimentation.

1. Solution is a homogeneous mixture

2. The particles of a solution are smaller than 1nm in diameter

3. It is composed of only one phase

4. All of these

Q. The solute cannot be separates from a homogenous solution by filtration.

1. True
2. False

Q. The amount of solute present in a given amount of solution represents:

1. dispersion
2. concentration
3. absorption
4. saturation

Q.

Alloy is an example of which type of solution?

1. Solid in Liquid solution
2. Gas in Liquid solution
3. Solid in Solid solution
4. Gas in Gas solution

Q. Which amongst the following is a true solution?

1. Sand and water
2. Blood
3. Milk
4. Salt solution

Q.

Which word refers to "two or more types of matter are evenly distributed in a mixture"?

1. Solution

2. Salination

3. Salutation

4. Problem

Q. Which of the following option cannot be used to identify the change when some sugar is dissolved in water?

1. Change in smell
2. Change in taste
3. Change in temperature
4. Change in colour

Q. Which of the following is not an example of a solution?

1. Salt water
2. Fizzy water
3. Vinegar
4. Sand in kerosene oil

Q. Based on the data given in the table below, identify substances A and B.​

Substance A	Substance B
Sour in taste	Bitter in taste
Obtained from minerals	Soapy to touch
Water- soluble	Water-soluble

1. A: Citric acid; B: Magnesium hydroxide​
2. A: Nitric acid; B: Sodium hydroxide​
3. A: Hydrochloric acid;​ B: Magnesium hydroxide​
4. A: Oxalic acid; B: Calcium hydroxide​

Q. On decreasing the temperature, what happens to the solubility of solute in solution?

1. increases

2. decreases

3. remains same

4. cannot be determined

Q.

Which of the following is/are solutions?

1. Salt dissolved in water

2. Stainless steel and salt dissolved in water

3. Stainless steel

4. Distilled water

Q. The path of a beam of light is invisible in which solution?

1. Colloidal solution
2. Heterogenous solution
3. All of the above
4. True solution

Q.

Match the following​.

Q. Which of the following option cannot be used to identify the change when some sugar is dissolved in water?

1. Change in smell
2. Change in colour
3. Change in taste
4. Change in temperature