Crystals and Crystallization

Q.

What is the purpose of adding alum to water during the process of purification?

1. Alum removes the heavy stones and other insoluble substances from water .

2. Alum removes the suspended clay particles from water.

3. Alum helps to remove odour from water.

4. Alum helps in removing bacteria from water.

Q.

I wanted to know what is the exact definition of a seed crystal

Q. What is the coordination number of spinel crystals and Inverse spinel?

Q. How do we get a pure substance from crystallization? What is the exact procedure for crystallization?

Q. Pure salts can be extracted from its solution using the method called .

1. filtration
2. crystallisation
3. vapourisation

Q. What do you mean by water of crystallisation of a substance?
[2 marks]

Q. If you are given some copper sulphate crystals, how would you proceed to prepare its saturated solution at room temperature?

Q. When are the crystals of copper sulphate obtained?

1. when hot acidic copper sulphate solution is cooled gradually.
2. when cold acidic copper sulphate solution is heated gradually.
3. when hot acidic copper sulphate solution is cooled suddenly.
4. when cold acidic copper sulphate solution is heated suddenly

Q. Why ionic compounds are not responsible for geometry

Q.

The correct procedure for heating a mixture of iron fillings and sulphur powder is:

1. 

2. 

3. 

4. 

Q. Separation of crystals of alum from impure sample is carried out through :

1. none of the above
2. distillation
3. centrifugation
4. crystallisation

Q.

____________ is a process that separates a pure solid in the form of its crystals from a solution.

1. Condensation

2. Filtering

3. Solidification

4. Crystallisation

Q.

___ is the technique is used to separate salt crystals from the sea water.

Q.

A good method to separate alum (phitkari) from impure samples is:

1. Sedimentation

2. Filtration

3. Crystallization

4. Sublimation

Q.

Copper sulphate can be obtained from its solution by the process of _______.

1. sublimation
2. filtration
3. crystallisation
4. solidification

Q.

Crystallisation is better than simple evaporation because:

1. soilds can decompose

2. may get charred when heated to dryness

3. the contaminate can still be present

4. all of these

Q.

Crystallisation is better than simple evaporation because:

1. the contaminate can still be present

2. all of these

3. soilds can decompose

4. may get charred when heated to dryness

Q.

____________ is a process that separates a pure solid in the form of its crystals from a solution.

1. Condensation

2. Filtering

3. Solidification

4. Crystallisation

Q.

A mixture of salt and ammonium chloride can be separated by crystallisation process.

1. True

2. False

Q.

Copper sulphate can be obtained from its solution by the process of _______.

1. sublimation
2. filtration
3. crystallisation
4. solidification

Q.

____________ is a process that separates a pure solid in the form of its crystals from a solution.

1. Condensation

2. Filtering

3. Solidification

4. Crystallisation

Q. The structure of $CuS{O}_4$ is in nature.

1. amorphous
2. crystalline
3. flexible

Q. structure is a type of crystal structure.

1. Tetrahedral
2. Linear
3. Planar

Q.

Crystallisation is better than simple evaporation because:

1. soilds can decompose

2. may get charred when heated to dryness

3. the contaminant can still be present

4. all of these

Q. The structure of $CuS{O}_4$ is in nature.

1. amorphous
2. crystalline
3. flexible

Q. The structure of $CuS{O}_4$ is in nature.

1. amorphous
2. crystalline
3. flexible

Q. Evaporation of solution of $CuS{O}_4$ helps in:

1. both $A$ and $B$
2. making it more concentrated
3. crystallization of $CuS{O}_4$
4. evaporation of salt $CuS{O}_4$

Q. Assertion :When a crystal is added to a supersaturated solution of itself, the crystal does not appear to change. Reason: The supersaturated solution is holding more solute than its normal solubility

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. structure is a type of crystal structure.

1. Linear
2. Planar
3. Tetrahedral

Q. Close packing is maximum in the crystal lattice of

1. Simple cubic
2. Face-centred cubic
3. Body-centred cubic
4. Primitive cube