Solution

Q.

German silver is an alloy of -

1. $\mathrm{Fe},\mathrm{Cr},\mathrm{Ni}$

2. $\mathrm{Ag},\mathrm{Cu},\mathrm{Au}$

3. $\mathrm{Cu},\mathrm{Zn},\mathrm{Ni}$

4. $\mathrm{Cu},\mathrm{Zn},\mathrm{Sn}$

Q. A solution contains 20 g of sugar dissolved in 180 g of water. The concentration of this solution will be ​_____.

1. $10\%$
2. $11\%$
3. $12\%$
4. $9\%$

Q. When liquid changes into gas it is called___.

1. condensation
2. melting point
3. evaporation
4. boiling point

Q.

What is a heterogeneous mixture? Give one example.

Q.

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

1. Brass

2. Bronze

3. Amalgam

4. Steel

Q.

Refining of Silver is done by _________

1. Poling

2. Cupellation

3. Liquation

4. Van Artikel Method.

Q.

State the use of Mercury in Sodium Amalgam.

Q. Which one of the following solids is insoluble in water?

1. Sand
2. Coffee powder
3. Salt
4. Sugar

Q.

Liquids that dissolve in water called

1. Universal solvent

2. Miscible liquids

3. Colloids

4. immiscible liquids

Q.

Out of following which one is not an example of a solution?

1. Air

2. Brass

3. Amalgam

4. Benzene in water

Q.

Brass is a solution of the molten copper in

1. solid zinc

2. molten zinc

3. gaseous zinc

4. molten tin

Q. Particle size in colloids ranges from:

1. 1 nm - 1000 nm
2. less than 1 nm
3. greater than 1000 nm
4. 10 nm - 1100 nm

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

1. solvent
2. solution
3. mixture
4. solute

Q.

The correct order which describes the true solution, colloidal solution and suspension in the order of their increasing stability is

1. Suspension< colloidal solution< true solution

2. Colloidal solution< true solution< suspension

3. True solution< colloidal solution< suspension

4. Colloidal solution< suspension< true solution

Q.

An alloy is an example of a

1. Gaseous solution

2. Liquid solution

3. Solid solution

4. Compound

Q.

Which is the correct formula for calculation weight percentage of a solution?

1. $\frac{\text{Mass of solvent}}{\text{Mass of solute}}\times 100$

2. $\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100$

3. $\frac{\text{Mass of solvent}}{\text{Mass of solution}}\times 100$

4. $\frac{\text{Mass of solution}}{\text{Mass of solute}}\times 100$

Q.

Alloying is not done for which of the following purpose?

1. To enhance the hardness of the metal

2. To enhance the tensile strength

3. To modify colour

4. To raise the melting point

Q.

A solution contains y ml of acetone in 150ml of solution. The concentration of the solution is $25\%$ in terms of volume by volume percentage. Find y.

1. 50

2. 40

3. 30

4. 20

Q.

Brass is an alloy of copper and zinc and has a lustrous yellow color

1. True
2. False

Q.

Imagine that you have created a solution of sugar and water in science class. Your teacher has asked you to retrieve the sugar in its dry state. Which plan of action below should you choose?

1. Do nothing because it is impossible to retrieve the sugar

2. Boil the solution

3. Let the water evaporate

4. Add more water in the solution

Q.

Statement 1: Ornamental Gold is a solution.

Statement 2: Ornamental Gold is a mixture.

1. Statement 1 is false, Statement 2 is true

2. Statement 1 is true, Statement 2 is false

3. Both the statements are false

4. Both the statements are true

Q. When a drop of water is added to a bottle of ink, the ink acts as a and the water acts as .

1. solute
2. solvent
3. solution
4. mixture

Q.

Glass is best described as a____.

1. Solid

2. Liquid

3. Colloidal Solution

4. Super cooled Liquid

Q. The formula for concentration of solution in terms of volume by volume percentage is:

1. $\frac{\text{volume of solute}}{\text{volume of solution}}\times 100$
2. $\frac{\text{volume of solvent}}{\text{volume of solute}}\times 100$
3. $\frac{\text{volume of solution}}{\text{volume of solute}}\times 100$
4. $\frac{\text{volume of solute}}{\text{volume of solvent}}\times 100$

Q.

Which of the following is/are NOT solution(s)?

1. brass

2. ocean water

3. air

4. carbon dioxide

Q.

Assertion: Two components of the binary solution are solute and solvent.

Reason:​ Particle size in true solution lies between $1$nm to $100$ nm.​

1. If ‘A’ and ‘R’ are true and ‘R’ is the correct reason for ‘A’.

2. If ‘A’ and ‘R’ are true and ‘R’ is not the correct reason for ‘A’.

3. If ‘A’ is correct and ‘R’ is wrong.

4. If ‘A’ is wrong and ‘R’ is correct.

Q.

Select the correct answer from a b c d and E for each statement given below.

1. Colloidal
2. Fused Calcium chloride
3. Solvent
4. Suspension
5. Washing soda

(5). A heterogeneous mixture of a dissolved particle in a dispersion medium, visible to the naked eyes.

Q.

Pick one material from the following which is completely soluble in water.

1. Chalk powder

2. Tea leaves

3. Glucose

4. Sawdust

Q.

What is the strongest solvent?

Q.

Which of the following alloy is used for making scientific instruments?

1. Steel

2. Bronze

3. Brass

4. Iron