ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

What are oxides ? 

Give two examples of metallic oxides.

What do you observe when Sulphur is heated and then tested with moist blue and red litmus – paper?

Complete and balance the following chemical equation.

\[\ce{KClO3 ->[heat]  ??   + O2}\]

Which one of the following is most likely to be corroded?

What happens when the mercuric oxide is heated?

Classify Copper oxide. Also give a balanced equation to prepare it.

Classify Sulphur dioxide. Also give a balanced equation to prepare it.

Classify Magnesium oxide. Also give a balanced equation to prepare it.

How will you prove that oxide formed by sulphur is acidic in nature?

Write word equation for the following molecular equation:

CuCo₃ → CuO + CO₂ [g]

Word equation:

State the characteristics or indications occurring in the above reaction.

Write word equation for the following molecular equation:

\[\ce{CaCO3 + 2HCl ->[\triangle] CaCl2 + H2O + CO2 [g]}\]

Word equation:

State which characteristic does [g] in the above reaction indicate. The word equation of:

Write word equation for the following molecular equation:

\[\ce{NH3 [g] + HCl [g] ⇌ NH4Cl [s]}\]

Word equation:
State which characteristic is observed in the above reaction.

Give an-example of a similar above characteristic, seen between two other gaseous reactants.

Write word equation for the following molecular equation:

Na₂SO₃ + 2HCl [dil.] → 2NaCl + H₂O + SO₂ [g] 

Write word equation for the following molecular equation:

FeSO₄ + 2NaOH →Na₂SO₄ + Fe(OH)₂ ↓

Word equation:

State why [↓] indication is seen after Fe(OH)₂ and not after Na₂SO4

Write word equation for the following molecular equation:

\[\ce{N2 + 3H2 ⇌[Fe - 450°C][200 atoms] 2NH3 + \triangle}\]

Word equation:
State why [+ Δ] indication is seen after NH₃.
State what 200 atmospheres – indicates.
State the function of Fe in the above reaction.

Write word equation for the following molecular equation:

\[\ce{H2 [g] + Cl2 [g] ->[sunlight] 2HCl}\]

Word equation:

State which form of energy is utilised in the above chemical reaction.

Write word equation for the following molecular equation:

AgN0₃ + HCI → HNO₃ + AgCl ↓

Word equation:

State whether AgCl is soluble or insoluble in HN0₃.

Write word equation for the following molecular equation:

CaO + H₂0 → Ca (OH)₂ + Δ

Word equation:

State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.

Write word equation for the following molecular equation:

\[\ce{CuSO4 + 2NaOH -> Na2SO4 + Cu(OH)2↓}\]

Word equation:

State the colour of the products.