Mixture

Q.

How will you separate oil and water from their mixture?

Q.

Give the definition of pure substances and mixtures?

Q.

Give two example of mixture containing solid-liquid particles.

Q.

What are the examples of Chemical Properties?

Q.

A student was asked to mix egg white with water and stir it well. What did you think he observed?

1. A transparent mixture is formed.

2. A translucent mixture is formed.

3. Egg white floats on the surface of the water.

4. Egg white settles at the bottom.

Q.

Classify the following reaction into exothermic and endothermic reactions-

Reaction between glucose and oxygen.

Q.

Which of the following is a liquid form of aerosol?

1. Fume

2. Dust

3. Mist

4. Smoke

Q.

Define a mixture. Is mixture composition is fixed or variable.

Q.

What are the dispersed phase and dispersed medium of smoke?

1. Solid dispersed in solid

2. Liquid dispersed in solid

3. Gas dispersed in solid

4. Solid dispersed in liquid

Q.

Give two reasons for supporting that sugar is a pure substance and not a mixture.

Q.

Give reason: oil in water is a heterogeneous mixture.

Q. In a mixture, the chemical properties of the components do not change but exhibit new physical properties. State true or false

1. True
2. False.

Q. What happens when some amount of solute is added to a saturated solution?

1. The solution becomes unsaturated.
2. The solution has undissolved solute
3. The solution becomes supersaturated.
4. None of the above

Q.

How do you break ${\mathrm{H}}_2\mathrm{O}$?

Q. Which of the following is true for a chemical change?
(I) New substance is formed.
(II) The change is reversible
(III) The change is permanent

1. Only (I)
2. Only (I) and (III)
3. Only (I) and (II)
4. (I), (II) and (III)

Q.

Growth of a seedling into a plant is a physical change.

1. True
2. False

Q.

A mixture of sulphur and iron fillings will dissolve completely in carbon disulfide.

1. True
2. False

Q. 56.Difference between enantiomeres and racemic mixtures?

Q.

A mixture of chloroform and water is taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of _____ and the lower layer will be that of _____.

Q. 1000 g of sucrose solution in water is cooled to -3.534 C. What mass of ice would be separated out at this temperature? K freezing water =1.86 K mol g

Q. The reaction in which energy is released is called:

1. Exoergic
2. Endoergic
3. Physical
4. Chemical

Q. Which of the following is not a characteristic of mixtures?

1. Mixtures have a specific set of properties
2. Mixtures contain two or more substances
3. Mixtures can be heterogeneous or homogeneous
4. Formation of mixtures does not involve energy change

Q.

When liquid air is warmed, which gas comes out first, Nitrogen or Oxygen?

Q.

The substance which is made by mixing two elements without being chemically combined is called a ___

1. mixture

2. compound

3. solution

4. solvent

Q.

Give one example of Liquid and liquid heterogenous mixture.

Q.

A mixture can be separated into its physical constituents by chemical methods.

1. True
2. False

Q.

Matter with definite and constant composition and distinct chemical properties is known as:

1. mixture

2. pure substance

3. impure substance

4. element

Q. Two or more substances when mingle together, but do not combine chemically forms a

1. Residue
2. Solution
3. Distillate
4. Mixture

Q.

14 (b). Mention the property on which the separation of the following mixtures would be based: a mixture of vinegar and oil

Q.

Sugar and sand mixed together is an example of:

1. A compound

2. A mixture

3. A solution

4. Both b and c