Define sublimate.

Important Questions on Separation of Substances

HARD

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 4 - Separation of Substances>EVALUATION>Q 1

Why do we need to separate mixtures?

HARD

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 4 - Separation of Substances>EVALUATION>Q 2

Which apparatus is used to separate two immiscible liquids? Explain with the help of an activity.

HARD

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 4 - Separation of Substances>EVALUATION>Q 3

Explain the principle of paper chromatography.

MEDIUM

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 4 - Separation of Substances>EVALUATION>Q 1

In a mixture of oil and water, why does oil always form a layer on the top of water?

HARD

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 4 - Separation of Substances>INTEGRATE>Q 1

Do we get the elements such as iron, aluminium and copper in free state in the Earth's crust? Or are they present in the form of compounds? Write a paragraph about the extraction of any one metal mentioned above.