A is an insoluble solid formed during a chemical reaction.
Important Questions on Chemical Reactions
Formation of precipitate
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Addition of in presence of .
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts are unnoticeable.
Change of state of the reactants.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Explain the following:
The mass of reactants in a chemical reaction does not change.
Name the gases that can be prepared from the following pairs of substances:
Zinc and dilute sulphuric acid.
Melting of ice is _____ reaction.
(Endothermic/ Exothermic)
(a)
(b)
(c)
(d)
Zinc sulphate
List
(A) Simple displacement
(B) Neutralisation
(C) Decomposition by acid
(D) Double decomposition
(E) Direct synthesis
Write the correct answer in the form of A, B, C, D or E for the statement given below:
Select a gas from the following which reacts with oxygen to give a neutral liquid.
[A: Hydrogen B: Copper [II] oxide C: Oxygen D: Copper [II] hydroxide E: Ammonia]
(i) Copper carbonate
(ii) Zinc carbonate
(iii) Mercury[] oxide
(iv) Lead [] oxide.
