Separation of Components of a Mixture

Q.

Give some examples of magnetic separation.

Q.

Explain the principle of magnetic separation.

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

Q.

Why is it necessary to separate the constituents of a mixture ?

Q.

What method of separation can be used to separate powdered sugar and salt?

Q.

Name the following.

The method used to separate iron filings from a mixture of sand and iodine

Q. Statement: The mixture of mud and water can be separated by the process of filtration. ​
Reason (R) : The process of separating insoluble substance from a liquid, using filter is called filtration.​

1. The statement is correct, but the reason is incorrect.​
2. Both the statement and the reason are incorrect.​
3. Both the statement and the reason are correct, and the reason is not the correct explanation for the statement.​
4. Both the statement and the reason are correct, and the reason is the correct explanation for the statement.​

Q.
The above mentioned apparatus is used to separate a mixture of:

1. Water and ink
2. Water and alcohol
3. Common salt and water
4. Ammonium chloride and common salt

Q.

After harvesting the crop, the farmer cannot separate husk from seed grins by handpicking.

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

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

Q.

Give an example of a mixture that is separated by picking out the components

Q.

An evaporating dish is a simple device which is used to separate the components of a liquid-liquid immiscible mixture(with liquids of different densities).

1. To obatin tea

2. To add impurity

Q.

Explain how magnetic separation is useful to us.

Q.

In a coffee machine, the ground coffee is separated from the coffee solution by using ___ .

1. Evaporator

2. Sand paper

3. A filter

4. Condenser

Q.

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

A mixture that has components with different magnetic properties.

Q. Salt from seawater is obtained by the process of.

1. centrifugation
2. evaporation
3. melting
4. filtration

Q. Which of the following method is not used to separate a solid - solid mixture?

1. Threshing
2. Sieving
3. Winnowing
4. Decantation

Q.

How will you separate a mixture of iron filings and carbon powder?

Q. Which method can be used to separate husk from flour in kitchen?

1. Sieving
2. Winnowing
3. Filtration
4. Threshing

Q.

Fill in the blanks:

_____ is separated from waste by magnetic separation.

Q.

Iron can be separated from sugar by filtration.

1. True
2. False

Q.

Consider the following statements.

i. $\mathrm{Fe}$ filings can be separated from $\mathrm{FeS}$by rolling a magnet over $\mathrm{FeS}$.

ii.$\mathrm{S}$ powder can be separated from $\mathrm{FeS}$ by dissolving $\mathrm{FeS}$in Carbon disulphide.

iii. A mixture of $\mathrm{Fe}$ filings and $\mathrm{S}$ powder can be separated either by a magnet or by using Carbon disulphide.

Identify the correct statements:

1. (i) and (iii)

2. (ii) and (iii)

3. (i) and (ii)

4. (iii) only

Q.

Which technique involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery?

1. Threshing

2. Sieving

3. Handpicking

4. Winnowing

Q. What is qualitative analysis experiment?

1. Identification of cations
2. Identification of gases
3. All of above
4. Identification of anions

Q. Which of the following can be separated by filtration?

1. Oil from water
2. Tea leaves from tea
3. Pebbels from sand
4. Seeds from fruit juice

Q. Which piece of laboratory equipment would be used to grind large crystals into a powder?

1. Crucible
2. Evaporating dish
3. Tongs
4. Erlenmeyer flask
5. Mortar and pestle

Q. Using winnowing, we can separate the grain from the .

1. stalk
2. husk
3. stones

Q.

Study the table given below.
$\begin{array}{ccc}\text{Mixture}& \text{Wanted}& \text{unwanted}\\ & \text{component}& \text{component}\\ \text{1. Wheat flour}& \text{Flour}& \text{X}\\ \text{2. Y}& \text{Grain seeds}& \text{Stalks}\end{array}$
Based on the above information, identify $X$ and $Y$.

1. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Husk}& \text{Cut paddy}\end{array}$

2. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Wheat}& \text{Husk}\end{array}$

3. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Wheat}& \text{Sawdust}\end{array}$

4. $\begin{array}{ccc}& \text{X}& \text{Y}\\ \text{(A)}& \text{Husk}& \text{Sand}\end{array}$

Q. We have to shake cough syrup before using because it is a ___________.

1. solution
2. colloid
3. pure substance
4. suspension

Q. Which amongst the following can be separated by handpicking?

1. Potato and tomato
2. Salt and sand
3. Rotten and fresh fruits
4. Oranges and apples