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

Write the balanced equation and give your observation when the following metal reacts:

Sodium with cold water

Write the balanced equation and give your observation when the following metal reacts:

Calcium with cold water

Write the balanced equation and give your observation when the following metal reacts:

Magnesium with boiling water

Write the balanced equation and give your observation when the following metal reacts:

Magnesium with steam

Give the balanced equation of the reaction.

Choose the correct option:

The composition of the nucleus of deuterium is

Choose terms from the options given in brackets to complete this sentence.

A metal …………….. hydrogen in the activity series gives hydrogen with …………… acid or …………… acid.

(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric). 

Correct the following statement:

Hydrogen is dried by passing it through conc. H₂SO₄.

Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.

Give a chemical test to distinguish between the following gases:

Hydrogen and oxygen

Give a chemical test to distinguish between the following gases:

Ammonia and hydrogen chloride

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’.