NCERT Separation of Substances Assertion and Reason Grade 6

Assertion: Filtration is a method used to separate insoluble solids from liquids. Reason: The solid particles settle down at the bottom of the container. Is this assertion and reason correct?

• true

• solid particles float on top

• filtration is used for gases

• false

Assertion: Evaporation is a method used to separate a mixture of salt and water. Reason: Water evaporates leaving behind salt crystals. Is this assertion and reason correct?

• false

• true

• Salt evaporates

• Water dissolves salt

Assertion: Magnetic separation is used to separate magnetic substances from non-magnetic substances. Reason: The magnetic substances are attracted by a magnet. Is this assertion and reason correct?

• not related

• true

• false

• partially true

Assertion: Decantation is a process used to separate a liquid from a solid that has settled at the bottom of the container. Reason: The liquid is poured out carefully without disturbing the solid. Is this assertion and reason correct?

• partially true

• true

• not applicable

• false

Assertion: Sieving is a method used to separate particles of different sizes. Reason: The smaller particles pass through the sieve while the larger particles are retained. Is this assertion and reason correct?

• false

• partially true

• not related

• true

Assertion: Filtration can be used to separate a mixture of sand and water. Reason: The sand particles dissolve in water. Is this assertion and reason correct?

• False

• Filtration is not a physical separation method

• Sand particles are lighter than water

• True

Assertion: Evaporation can be used to separate a mixture of ink and water. Reason: The ink evaporates faster than water. Is this assertion and reason correct?

• No, the ink does not evaporate

• Yes

• No

• Yes, but the ink evaporates slower than water

Assertion: Magnetic separation is effective in separating iron filings from a mixture of iron filings and sulfur powder. Reason: Iron filings are attracted to the magnet while sulfur powder is not. Is this assertion and reason correct?

• Only the reason is correct.

• Only the assertion is correct.

• Both the assertion and reason are correct.

• Neither the assertion nor the reason is correct.

Assertion: Decantation is a quick method to separate a mixture of oil and water. Reason: Oil floats on water and can be easily poured out. Is this assertion and reason correct?

• Oil sinks in water

• Decantation is a slow method

• false

• true

Assertion: Sieving is used to separate a mixture of rice and lentils. Reason: Rice and lentils have different sizes and can be separated using a sieve. Is this assertion and reason correct?

• True, sieving is used to separate substances based on their color

• true

• False, sieving is used to separate liquids not solids

• False, sieving is used to combine mixtures not separate them