Chemical Reactions and Equations Quiz

What change in the colour of iron nails and copper sulphate solution you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?

Why is respiration considered an exothermic process?

Name a reducing agent that may be used to obtain manganese from manganese dioxide.

Balance the following reactions i) Fe(s) + H2O(g) Fe3O4(s) + H2(g)

Balance the following reactions ii) Pb(NO3)2(s) Pb0(s) + NO2(g) + O2(g)

Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

What is the colour of ferrous sulphate crystals? How does this colour change after heating?

Calcium Oxide reacts vigorously with water to produce slaked lime. This reaction can be classified as:

• Combination Reaction

• Exothermic Reaction

• Endothermic Reaction

• Oxidation Reaction

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid formed remains in the solution. The reaction is an example of:

• Combination Reaction

• Displacement Reaction

• Decomposition Reaction

• Double Displacement Reaction

In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:

• exchange of atoms takes place

• exchange of ions takes place

• a precipitate is produced

• an insoluble salt is produced