Questions
Which of the following statements is true regarding mixtures?
- Mixtures are of three types.
- The components of a mixture do not retain their properties.
- Components of a mixture are present in any proportion.
- Mixtures are pure substances.
- Mixture is made up of one type of element.
Which statement is/are false regarding alloys to be considered as a solution?
- Components of an alloy cannot be separated by physical methods.
- Their boundaries are not distinct.
- They show Tyndall effect.
- Both 1 and 3
- Both 2 and 3
In a solution, solvent can be solid, liquid or gas, and solute can be ________.
(a) solid
(b) liquid
(c) gas
Which of the above given options is/are correct?
- Only a
- Only b
- Only c
- Only b and c
- All of these
The process of distillation is used to separate two miscible liquids. The technique of distillation is based on the _________ of components of mixture.
- difference in freezing points
- fractional difference in their boiling points
- travel speed of components
- difference in the boiling points
- difference in weights
Match the following correctly:
| 1 | Alloys | a | Heterogeneous mixture |
| 2 | Elements | b | Pure substance |
| 3 | Tyndall effect | c | Solution |
- 1 - c, 2 - b, 3 - a
- 1 - a, 2 - b, 3 - c
- 1 - c, 2 - a, 3 - b
- 1 - b, 2 - a, 3 - c
- 1 - a, 2 - c, 3 - b
In which of the following applications is separation of components not done, on the basis of fractional differences in the boiling points of components?
- In petroleum refineries, petrochemical and chemical plants
- In separation of fat from milk
- In oil refineries to separate crude oil into useful substances
- In the separation of ethanol and water
- In the separation of oxygen, liquid nitrogen and argon from air
To separate different gases from air, which method is used?
- Centrifugation method
- Evaporation
- Sublimation
- Fractional distillation
- Chromatography
Which of the following statements is false regarding the properties of a suspension?
- Suspensions are a heterogeneous mixture of two or more substances.
- Particles of solute do not dissolve in solvent.
- The size of particles of suspension is very small.
- Suspension shows Tyndall effect.
- Milk of magnesia is a suspension.
Which of the following pairs of solvent and solute is incorrect?
- Water - Solvent in salt solution, Salt - Solute in salt solution
- Iodine - Solvent in tincture of iodine, Alcohol - Solute in tincture of iodine
- Water - Solvent in lemonade, Lemon - Solute in lemonade
- Carbon - Solute in steel, Iron - Solvent in steel
- Nitrogen - Solvent in air, Other gases - Solute in air
By the method of centrifugation, which type of components are separated in a mixture of two immiscible liquids?
- Components which are chemically different
- Components which are heavier and lighter
- Components which are of different colours
- Components that have a fractional difference in their boiling points
- None of these
Which of the following statements is false regarding the properties of a homogeneous mixture?
- The particles of a homogeneous mixture are less than one nanometre in size.
- The boundaries of particles cannot be differentiated.
- A homogeneous mixture shows Tyndall effect.
- When a ray of light is passed through a homogeneous mixture, the path of light is not visible.
- A mixture of salt and water is a homogeneous mixture.
Which of the following belong to the category of heterogeneous impure substances?
- Compounds
- Suspensions
- Solutions
- Colloids
- Only 1
- Only 4
- Both 2 and 4
- 2, 3 and 4
- Both 1 and 3
Which of the following substances is/are not sublimable?
- Dry ice
- Carbon
- Naphthalene balls
- Ammonium chloride
- None of these
Chromatography is used in
(a) separation of colours from dyes
(b) pathological test of blood and urine
(c) separation of drugs from blood for pathological tests
- Only a
- Only b
- Only c
- Only a and c
- Only a and b