Mixtures

Q.

Give one example of a homogeneous mixture.

Q. A bar magnet is suspended and free to rotate. In which direction will the North pole of the magnet point?

1. Northwards
2. Southwards
3. Westwards
4. Eastwards

Q.

What is the relation between pole strength and magnetic moment?

Q. Two or more substances which are not chemically combined but only mixed together form a ________.

1. residue
2. compound
3. distillate
4. mixture

Q. Give two examples of pure substances

Q. What type of a substance is steel?

1. A solid - liquid heterogeneous mixture.
2. A solid - solid heterogeneous mixture.
3. A solid - solid homogeneous mixture
4. A pure substance

Q.

You are provided with the following materials – turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil. Make any three pairs of substances where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.

Q.

Is milk a pure substance?

Q.

Soda is a mixture of water and carbon dioxide.

1. True

2. False

Q.

Define element, compound and mixture. What are homogeneous and heterogeneous mixtures? Give two differences between homogeneous and heterogeneous mixtures.

Q.

Name the method of separation used to separate Pebbles and sand at a construction site.

Q.

Name four pure liquids.

Q.

The S.I. unit of pole strength is

1. $A{m}^2$

2. $Am$

3. $A{m}^{-1}$

4. $A{m}^{-2}$

Q. Electrical energy is produced from the ____________ within the cell.

1. metals
2. positive terminal
3. chemicals
4. negative terminal

Q.

Give reason: Soil is a mixture

Q.

Question 2

(a) What are insoluble substances?

(b) Name a few solid substances that are insoluble in water.

(c) Name a few liquid substances that are insoluble in water.

Q. An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

1. Mustard oil ​
2. Soft drink​
3. Coconut oil ​
4. Kerosene​

Q. Soil is a natural mixture.

1. True
2. False

Q.

If there are more than one type of molecules present in a substance, it is called a:

1. mixture

2. compound

3. solution

4. solvent

Q.

Tap water is a mixture.

1. True
2. False

Q.

Which of the following statement/s describe the solution?

STATEMENT 1: A solution is a homogenous mixture of two or more substances.

STATEMENT 2: Brass is a solid-solid mixture.

STATEMENT 3: Solutions are mixtures of different molecules that are evenly distributed.

STATEMENT 4: Lemonade is an example of a solution.

1. Both statements 3 and 4 are true.

2. All are correct.

3. Only statement 1 is true.

4. Only statement 2 is true.

Q. Select the food combo which is rich in both carbohydrates and protein.

1. Meat and egg
2. French fries and coke
3. 
   Chapati and paneer
4. Bread with butter

Q. Classify the following into pure substances or mixtures oxygen, steel, copper sulphate, lemon juice.

Q.

Mention the appropriate methods for the separation of the following mixture :

A solid-solid mixture in which the components have different size.

Q. Salt water is a classic example of ___ mixture .

1. Threshing

2. Sieving

3. Handpicking

4. Winnowing

Q. Which of the following represents a mixture?

1. Gunpower
2. Calcuium carbonate
3. Hydrogen chloride
4. Ammonia

Q. The substances in a mixture can be separated on account of the differences in their ________ properties.

1. physical
2. chemical
3. electrical
4. mechanical

Q. A student collected the samples of vinegar, lemon juice, coconut oil, and kerosene. He took different glass tumblers and half-filled them with water. Then, he added all the above samples of liquids to the different tumblers and stirred. After that he noted his observation. What do you think he observed?

1. Both A and B
2. Vinegar dissolved in water
3. Coconut oil dissolved in water
4. Lemon juice dissolved in water.

Q. Which of the following mixtures cannot be separated by sieving ?

1. Pebbles & sand
2. Rice & dust
3. Salt & water
4. Oil & water
5. Apples & pears
6. Husk & flour
7. Sugar & water
8. Milk & water

Q.

How do we separate impurities and bran from flour? why?