Science : Ch 01 – Chemical Reactions and Equations

Give an example of decomposition reaction taking place in our body.

What happens when sodium sulphate solution is added to barium chloride solution?

Identify the reducing agent in the following reactions 4NH₃ + 5O₂ → 4NO + 6H₂O

Identify the reducing agent in the following reactions: 2H₂ + O₂ → 2H₂O

Mention whether it is a physical or chemical changes: -Evaporation of petrol

Mention whether it is physical or chemical changes:- Burning of Liquefied Petroleum Gas (LPG)

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

Mention whether it is physical or chemical changes :Curdling of milk

Which of the subsequent is (are) an endothermic process(es)?

1. Dilution of sulphuric acid
2. Sublimation of dry ice
3. Condensation of water vapours
4. Evaporation of water

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 so formed remain in the solution. The reaction is an example of a:

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

which of the subsequent chemical equations do the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should blend with it a solution of:

Which of the subsequent does show an oxidation reaction

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

1. Displacement reaction
2. Precipitation reaction
3. Combination reaction
4. Double displacement reaction