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

From the following list of salts: Na₂SO₄, 10H₂O, NaCl, KClO₃, NaNO₃, Ca(OH)₂, NH₄Cl, KCI, CaSO₄.

State the salts whose solubility is fairly independent or slightly increases with a rise in temperature of the water.

What is a solubility curve. State two applications and two benefits of the solubility curve.

Give the influence of temperature on the solubility of gases in water.

State the reason why boiled water tastes flat.

State the reason why a soda water bottle opens with a ‘fizz’.

Write down the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.

Washing soda and iron [III] chloride are separately exposed to the atmosphere. State

1. the observations seen
2. the phenomenon which occurs
3. the reason for the phenomenon occurring in each case.

Would a similar phenomenon occur in case of exposure of common salt. Explain giving reasons.

Explain in brief the experimental proof which led to the discovery of –

Neutrons

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

At low temperatures, the solubility of a gas in water is ____ compared to that at ordinary temperatures.

Give reason for the following:

Solubility curves find utility in separation and purification of solutes.

Give a reason for the following:

Pressure and temperature influence the solubility of gases in water.

Name or state the following:

A salt whose solubility decreases with rise in temperature of the solvent water.

Differentiate between the following:

Solubility and solubility curve

Complete and balance the equation:

Conversion of hydrogen to -

Water - 2H₂ + O₂ → ________

Complete and balance the equation:

Conversion of hydrogen to -

Hydrogen chloride - H₂ + Cl₂ → ________

Complete and balance the equation:

Conversion of hydrogen to -

Ammonia - N₂ + 3H₂  ⇌ ______

Complete and balance the equation:

Conversion of hydrogen to -

Hydrogen sulphide - H₂ + S → ________

Complete and balance the equation:

Hydrogen in metallurgy - reduction of

Zinc oxide - ZnO + H₂ → ________ + ______

Complete and balance the equation:

Hydrogen in metallurgy - reduction of

Iron [III] oxide - Fe₂O₃ + 3H₂ → ________ + ______

State the number of neutrons in each of the atoms A to E. Also state which of the atoms A to E is a metal.