Mixtures

Q. 80 mL of solution contains 20 g of solute. Calculate the concentration in terms of mass by volume percentage of the solution.

1. 25%
2. 35%
3. 45%
4. 55%

Q.

How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.

Q.

Classify the following substances into elements, compounds and mixtures:

(i) air (ii) common salt (iii) iron fillings (iv) marbles (v) oxygen (vi) milk (vii) zinc (viii) bronze (ix) sand (x) water

Q. To make a saturated solution, 15 g of sodium chloride is dissolved in 85 g of water at 293 K. Calculate the concentration in terms of mass by mass percentage at this temperature.

1. 15%
2. 24%
3. 20%
4. 21%

Q. Sugar is added to a cup of tea. Here, sugar is a

1. Solute
2. Solvent
3. Colloid

Q. When the amount of solute present in the solution is very low as compared to solvent, it is said to be _________.

1. concentrated
2. diluted
3. colloidal
4. pure

Q.

What is meant by constituents of mixture?

Q. Which of the following can be considered as mixtures?

1. Blood
2. Copper
3. Salt solution
4. Iron

Q. Milk is an example of mixture

1. Homogeneous
2. Heterogeneous
3. uniform

Q.

The composition of a syrup is

1. variable

2. fixed

3. both (a) and (b)

4. none of these

Q.

What type of matter is sandstone?

1. Heterogeneous mixture

2. Hetero compound

3. Homogeneous mixture

4. Pure compound

Q.

Name the compound formed when iron is heated with sulphur?

Q. ___ allows the solute to dissolve in it and form a solution.

Q. Which of the following are examples of mixtures?

1. Chalk water
2. Iron
3. Air
4. Salt water

Q. Give two examples for each of the following:​
Solid + Liquid mixture​ ​

Q. Is milk a homogeneos or heterogeneous mixture? Explain.

Q. Due to which of the following factors, winnowing is used to separate husk from grains?

1. Husk is very light as compared to grains
2. Grains are very light compared to husk
3. Husk has a different colour
4. Husk and grains are of same size

Q. is the mixture of iron and sulphur a homogeneous or heterogeneous mixture ?

Q. Statement 1: Air, lemonade and milk are mixtures.
Statement 2: Copper, aluminium and iron are elements.

1. Both statement 1 and statement 2 are incorrect.
2. Both statement 1 and statement 2 are correct.
3. Statement 1 is correct and statement 2 is incorrect.
4. Statement 2 is correct and statement 1 is incorrect.

Q. Classify the following substance into elements, compounds and mixtures:

• Aerated drinks.

Q. classify the following as homogeneous or heterogenous mixture
1) talcum powder
2) lead carbonate solution
3) milk

Q. For each of the following matter given below, use letters to indicate whether it is an element (E), or a compound (C) or mixture (M).

Sl. no.	Matter
1.	Distilled water
2.	Mercury
3.	Air
4.	Tin

1. 1- (C); 2- (E); 3- (M); 4- (M)
2. 1- (M); 2- (C); 3- (M); 4- (E)
3. 1- (C); 2- (E); 3- (M); 4- (E)
4. 1- (M); 2- (E); 3- (M); 4- (C)

Q. A pure substance is made up of only one type of particles.

1. True
2. False

Q. The process by which complex molecules are broken down into simpler substances is known as _________ .

1. secretion
2. assimilation
3. respiration
4. digestion

Q. State four differences between compound and mixtures.​