When a piece of iron metal is placed in copper sulphate solution then iron sulphate and copper metal are formed. What type of reaction is this?

Write a balanced chemical equation for the following:

• Reaction of lead nitrate solution with ammonium hydroxide.

Distinguish between the following pair of compounds using a reagent as a chemical test:

• Calcium nitrate and zinc nitrate solution.

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 remains in the solution. The reaction is an example of a :

Upon dipping a copper rod, the aqueous solution of the salt that can turn blue is:

Complete the given chemical reaction: 

${\mathrm{CuSO}}_4\left(\mathrm{aq}\right)+\mathrm{Fe}\left(\mathrm{s}\right)\to \mathrm{\_\_\_\_\_} +\mathrm{\_\_\_\_\_}$.

Name the type of reaction. 

The reaction of iron nail with copper sulphate solution is _____ reaction. 

Which of the following reaction does not takes place? State the reason.

(i) ${\mathrm{FeSO}}_4 + \mathrm{Mg} \stackrel{}{\to }{\mathrm{MgSO}}_4 + \mathrm{Fe}$  

(ii) ${\mathrm{ZnSO}}_4 + \mathrm{Cu} \stackrel{}{\to }{\mathrm{CuSO}}_4 + \mathrm{Zn}$ 

State one relevant observation for of the following:

Barium chloride solution is slowly added to sodium sulphate solution.

${\mathrm{Fe}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Fe}$

The above reaction is an example of a 

The reaction of the iron nail with copper sulphate solution is a _____ reaction. 

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

(A) exchange of atoms takes place.

(B) exchange of ions takes place.

(C) a precipitate is produced.

(D) an insoluble salt is produced.

The correct option is: