(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Explain the following observation:

Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?

Differentiate between hydrated and anhydrous crystals with examples. State three defined changes that occur when hydrated copper sulphate is heated.

Select the correct word from the words in option to complete the sentence:

Efflorescence occurs when the vapour pressure of the hydrated crystals is ____ than the vapour pressure of the atmospheric humidity.

Select the correct answer from the choice given in the options.

An anhydrous crystal _____.

Select the correct answer from the choice given in the options.

An anhydrate of a heptahydrate salt _____.

Give a reason for the following:

Heating a hydrated copper sulphate crystal is deemed a chemical change.

Name or state the following:

A liquid hydroscopic substance.

Differentiate between the following:

Deliquescent salt and hygroscopic salt

State the condition and give balanced equation for the conversion of coke to water gas.

Explain the term oxidation in term of addition and removal of oxygen/hydrogen with a suitable example. 

Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example.

Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.

State what is oxidising agent. Give an example of oxidising agent in the gaseous, liquid, and solid form.

State what is reducing agent. Give an example of oxidising agent in the gaseous, liquid, and solid form.

Give two test for an oxidising agent.

Give two tests for a reducing agent.

Select the correct answer from the symbol in the bracket.

The element, which like hydrogen is a strong reducing agent.

Explain the meaning of the term ‘compound’ with a suitable example.

State the main characteristics of a compound with special reference to the compound iron [II] sulphide.

Write the name of the following compound:

KClO