Science : Ch 01 – Chemical Reactions and Equations

Which reaction takes place when layer of silver deposit on copper wire when dipped in silver nitrate solution?

Identify the reducing agent in the following reactions: Fe₂O₃ + 3CO → 2Fe + 3CO₂

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:- Burning of Liquefied Petroleum Gas (LPG)

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

State the reactions are exothermic or endothermic in nature: Decomposition of ferrous sulphate

State the reactions are exothermic or endothermic in nature: Dissolution of ammonium chloride in water

Which of the following is not a physical change?

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:

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:

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