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Elements, Compounds and Mixtures - 2

Description: Elements, Compounds and Mixtures - 2
Number of Questions: 20
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Tags: Elements Compounds and Mixtures - 2 Mixture , Characteristics of Mixture Disitillation, Fractional Distillation
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Why is the separation of rock and diamond done by mechanical picking?

  1. It is because they have different reactivities.

  2. It is because they have different solubilities.

  3. It is because they have different colours.

  4. It is because they have different melting points.


Correct Option: C
Explanation:

Their colour difference helps in separation by mechanical picking.

Which of the following can be separated by sublimation?

  1. Iodine and salt

  2. Sodium nitrate and sodium chloride

  3. Sugar and sand

  4. Iron ore and impurities


Correct Option: A
Explanation:

As iodine sublimes on heating, it can be separated by the process of sublimation.

Which method is used to seperate a mixture of sand and sulphur?

  1. Fractional crystallisation

  2. Solvent extraction

  3. Sublimation

  4. Gravity separation


Correct Option: B
Explanation:

Sulphur dissolves in carbon disulphide. Therefore, it can be separated from sand.

Which property of iron helps in its separation from a mixture?

  1. High mass of iron

  2. Magnetic properties

  3. Chemical properties

  4. Density of iron


Correct Option: B
Explanation:

Due to magnetic property of iron, it is easily separated from its mixture.

Which method is used to separate sugar and sand?

  1. Magnetic separation

  2. Gravity separation

  3. Mechanical picking

  4. Solvent extraction


Correct Option: B
Explanation:

They can be separated by gravity separation as sugar is soluble in water and sand is heavier.

Which characteristic of copper allows it to be easily separated from iron?

  1. Colour

  2. Melting point

  3. Density

  4. Boiling point


Correct Option: A
Explanation:

Copper is dark brown in colour, which helps in separation by mechanical picking.

Which method of separation is used when components are soluble in water but their solubilities are different?

  1. Sublimation

  2. Fractional crystallization

  3. Solvent extraction

  4. Mechanical picking


Correct Option: C
Explanation:

Solvent extraction utilises difference in solubilities of components.

The process of converting a liquid into its vapour by heating and then condensation of vapour back into liquid is called

  1. filtration

  2. evaporation

  3. distillation

  4. decanation


Correct Option: C
Explanation:

Distillation involves conversion of liquid into vapour, and then back into liquid.

By which process are the suspended particles removed from natural water?

  1. Evaporation

  2. Solvent extraction

  3. Filtration

  4. Sedimentation


Correct Option: C
Explanation:

Filtration through beds of sand and gravel is used to remove suspended particles from natural water.

Alcohol (boiling point - 78.5°C) and water (boiling point - 100°C) are miscible. How can they be separated?

  1. Using a separating funnel

  2. Distillation

  3. Filtration

  4. Evaporation


Correct Option: B
Explanation:

Difference in boiling points allows separation of these liquids by distillation.

Which of the following methods is used to separate solid-solid mixtures?

  1. Sedimentation

  2. Solvent extraction

  3. Distillation

  4. Boiling


Correct Option: B
Explanation:

Solvent extraction can be used to separate solid-solid mixtures.

Which of the following is not common to evaporation and distillation?

  1. Heating of liquid

  2. Separation of solid-liquid mixtures

  3. Separation and recovery of dissolved solid and liquid

  4. Conversion of liquid to vapour


Correct Option: C
Explanation:

Separation and recovery of dissolved solid and liquid is possible only in distillation. It is not possible in evaporation.

Which method is used to obtain diesel, natural gases, etc. from crude petroleum?

  1. Fractional distillation

  2. Sedimentation

  3. Filtration

  4. Solvent extraction


Correct Option: A
Explanation:

Diesel, natural gas, etc. are obtained from crude petroleum by fractional distillation.

Kerosene and oil are immiscible. How are they commonly separated?

  1. Distillation

  2. Evaporation

  3. Using separating funnel

  4. Using fractional distillation


Correct Option: C
Explanation:

Immiscible liquids are separated by using a separating funnel.

Which of the following is not used to separate solid-liquid mixtures?

  1. Distillation

  2. Evaporation

  3. Fractional distillation

  4. Sedimentation


Correct Option: C
Explanation:

It is used to separate liquid-liquid mixtures.

Which method is used to separate few micrograms of a substance in a mixture?

  1. Chromatography

  2. Fractional distillation

  3. Separating funnel

  4. Sublimation


Correct Option: A
Explanation:

Chromatography has an advantage. It can separate substances present in very small quantities.

Which method utilises difference in boiling points for separation of two miscible liquids?

  1. Separating funnel

  2. Chromatography

  3. Fractional distillation

  4. Filtration


Correct Option: C
Explanation:

It is used for miscible liquids and utilises the difference in their boiling points for separation.

Which of the following is not true about chromatography?

  1. It consists of two fixed phases.

  2. It is used to purify industrial products.

  3. It identifies different constituents of a mixture.

  4. It can separate quantities of the order of microgram.


Correct Option: A
Explanation:

It consists of two phases. One is fixed and the other one is moving.

The process of sublimation is used to separate a mixture of salt and ammonium chloride, because

  1. ammonium chloride directly changes from solid to liquid state on heating

  2. ammonium chloride directly changes from liquid to solid state on heating

  3. ammonium chloride directly changes from solid to gaseous state on heating

  4. ammonium chloride directly changes from gaseous state to solid state on heating


Correct Option: C
Explanation:

It is because ammonium chloride sublimes on heating.

Which of the following is not true regarding methane?

  1. It is composed of more than one element.

  2. Its elements are chemically combined.

  3. Its constituents are separated by chemical or electrochemical means only.

  4. Its elements are combined in variable proportions.


Correct Option: D
Explanation:

Methane is a compound and its elements are combined in fixed proportion.

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