Science : Ch 01 – Chemical Reactions and Equations

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

What type of reaction is represented by: A + BC → AC + B ?

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

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Name the type of reaction taking place.

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

Mention whether it is physical or chemical changes: Sublimation of solid ammonium chloride

Sate the reactions exothermic or endothermic in nature: Dissolution of sodium hydroxide in water

In the electrolysis of water, name the gases liberated at cathode

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is:

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

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:

One of the following processess doesnot require a chemical 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