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

Hydrogen can be prepared with the metal zinc by using:

acid

Hydrogen can be prepared with the metal zinc by using: alkali

Give an equation to express the reaction between:

Steam and red hot iron

Give an equation to express the reaction between:

Calcium and water 

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

Name the gas formed in the reaction. How would you test the gas?

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

Write an equation for the reaction.

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.

What do you observe when a few drops of red litmus solution are added to the turbid solution.

Thin strips of magnesium, copper, and iron are taken.

Write down what happens when these metals are treated as follows:

1. Heated in presence of air
2. Heated with dil.HCl
3. Added to an aqueous solution of zinc sulphate.

Thin strips of magnesium, copper, and iron are taken.

Arrange these metals in descending order of reactivity. 

Choose the correct option:

Hydrogen is evolved by the action of cold dil. HNO₃ on

Which metal is preferred for collecting hydrogen from Cold water? Write the balanced equation.

Which metal is preferred for collecting hydrogen from:
Write the balanced equation

Hot water

Which metal is preferred for collecting hydrogen from steam? Write the balanced equation for the case.

Based on the reactions of water on metals, arrange the following metals in increasing order of reactivity: iron, sodium, magnesium, zinc, calcium

Hydrogen is obtained by displacement from:

1. dilute sulphuric acid
2. dilute hydrochloric acid

Write equations using zinc and iron.
Why does copper not show similar behavior?

Give reason for the following:

Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen. 

Metal in the powdered form reacts very slowly with boiling water, but it decomposes in steam. Name the metal.

Write a balanced equation for the reaction named metal with (i) boiling water (ii) steam.