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

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

A deliquescent salt of a divalent metal _____.

What do the following symbols [or formula] denote : 2H ; H₂ ; H⁺. [two atoms, molecule, ion]

Write a correctly balanced equation for the following “word equation”:
calcium + water → calcium hydroxide + hydrogen

When steam is passed over red-hot iron, magnetic oxide of iron and hydrogen are obtained. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement.

How can you obtain hydrogen from sodium hydroxide [not by electrolysis].

Write balanced equation for the following reaction:
magnesium + dil. hydrochloric acid → ___

Name a gas which burns in air or oxygen forming water.

Write a correctly balanced equation for the following:

When steam is passed over red hot iron.

Explain the following:

Two jars of H₂ are collected – “one burns quietly and the other does not”.

Write correctly the balanced equation for the following:

‘When zinc filings are added to a concentrated solution of sodium hydroxide’.

Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’.

Write down the “word equation” for the following reaction:

sodium hydroxide solution + zinc → ?

What do you observe when a piece of sodium is dropped into cold water?

How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis?

Complete and balance the following equations:

Al + NaOH + ____ → ____ + ____

What do the following symbols represent : 2H and H₂.

Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis].

Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen.

Give balanced equation for obtaining hydrogen from cold water using a monovalent active metal.

Give balanced equation for obtaining hydrogen from cold water using a divalent active metal.