Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

Salvarsan is arsenic-containing drug which was first used for the treatment of ______.

The number of ions formed on dissolving one molecule of FeSO₄.(NH₄)₂SO₄.6H₂O in water is ______.

Write the structure of 3-methyl butanal

What happens if external potential applied becomes greater than E°cell of electrochemical cell?

Write two differences between an ideal solution and a non-ideal solution.

Account for the following : Nitrogen does not form pentahalide.

Write the structure of 2-methylbutanal.

Why are solids rigid?

Why do solids have a definite volume?

Classify the following as amorphous or crystalline solids:

Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Why is glass considered a super cooled liquid?

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?

Define the term ‘amorphous’.

What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?

‘Stability of a crystal is reflected in the magnitude of its melting points.’ Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

How many types of solutions are formed? Write briefly about each type with an example.

Give an example of solid solution in which the solute is a gas.

Can you store copper sulphate solutions in a zinc pot?