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

Complete and balance the equation:

[General method]

Reactions of metals with dilute acids

Aluminium - 2Al + 3H₂SO₄ → ______+ _______ [g] 

Complete and balance the equation:

[General method]

Reactions of metals with dilute acids

Zinc - Zn + 2HCl → ______ + _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals with dilute acids

Iron - Fe + 2HCl → ______ + _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals - alkali [conc. soln.]

Zinc - Zn + 2NaOH → ______ + _______ [g]

Zn + 2KOH → ____ + _____ [g]

Complete and balance the equation:

[General method]

Reactions of metals - alkali [conc. soln.]

Lead - Pb + 2NaOH → ______ + _______ [g]

Complete and balance the equation:

[General method]

Reactions of metals - alkali [conc. soln.]

Aluminium - 2Al + 2NaOH + 2H₂O → ______ + _______ [g]

2Al + 2KOH + 2H₂O → _____ + _____ [g]

Name an element whsich reacts violently with water at room temperature.

Complete and balance the equation:

[Industrial Method - Bosch process]

• Step I - Production of water gas -
  \[\ce{C + H2O->[1000°C]}\] [____ + ____] - Δ
• Step II - Reduction of steam to hydrogen by carbon monoxide
  \[\ce{CO + H2 + H2O->[450°C][Fe2O3]}\] _____ + ____ [g]
• Step III - Removal of unreacted carbon dioxide and carbon monoxidefrom the above mixture
  KOH + CO₂ → _________ + ______ 
  CuCl + CO + 2H₂O → _______

Account for the following fact:

Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid.

Account for the following fact:

Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.

State the electronic configuration of hydrogen [at. no. 1].e
Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table.

How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?

Give a balanced equation for obtaining hydrogen from?

Steam using a trivalent metal

Give a balanced equation for obtaining hydrogen from?

Steam using a metal – and the reaction is reversible.

State why hydrogen is not prepared in the laboratory by the action of sodium with cold water.

State the condition and give balanced equation for the conversion of water gas to hydrogen – in the Bosch process.

State the reactant added to hydrogen to obtain the respective product in following case.

Ammonia

State the reactant added to hydrogen to obtain the respective product in following case.

Hydrogen chloride

State the reactant added to hydrogen to obtain the respective product in following case.

Water

State the reactant added to hydrogen to obtain the respective product in following case.

Hydrogen sulphide