Chemical Reactions and Equations

Choose the combination reaction:

• Extraction of metal

• Burning of metal

• Addition of more active metal to a solution of less active metal compound

• Electrolysis.

Choose double displacement reaction

• X + YZ ⟶ XY + Z

• X + Y ⟶ XY

• XYZ ⟶ YZX

• XY + AB ⟶ XA + YB.

Which of the following reactions is not a redox reaction?

• Mg + Cl₂ ⟶ MgCl₂

• CuO + H₂ ⟶ Cu + H₂O

• AgNO₃ + NaCl ⟶ AgCl + NaNO₃

• MnO₂ + 4HCl ⟶ MnCl₂ + 2H₂O + Cl₂

Identify the redox reaction from amongst the following reactions:

• AgNO₃ + HCl ⟶ AgCl + HNO₃

• PbCl₂ + H₂SO₄ ⟶ PbSO₄ + 2HCl

• NH₃ + HCl ⟶ NH₄Cl

• MnO₂ + 4HCl ⟶ MnCl₂

Which one of the following changes is not oxidation?

• Combination

• Double displacement

• Corrosion

• Rancidity.

In the equation CuO + H₂ ⟶ Cu + H₂O, the substance reduced is

• CuO

• H₂

• Cu

• none of these.

When copper vessels are kept over a period of time, these get coated with a green surface. This is due to

(i) oxidation of copper

(ii) corossion of copper

(iii) reduction of copper

(iv) hydrolysis of copper

• (i) and (ii)

• (ii) and (iii)

• (i) and (iv)

• (ii) and (iv)

Which of the following process does not produce decomposition reaction?

• Electrolysis

• Exposure to light

• Distillation

• Thermal

Which of the following is not a redox reaction?

• Burning of magnesium ribbon in air

• Addition of dilute hydrochloric acid to zinc granules

• Addition of silver nitrate to sodium chloride

• Release of energy during respiration

What is not true in a balanced chemical equation?

• Number of atoms of different elements on both sides are equal

• Mass of both sides are equal

• Number of charged ions on both sides are equal

• Total of charges on both sides are equal