Double Displacement Reaction

Q.

What is a redox reaction? In the following reaction, identify ​

(i) the substance oxidised (ii) the substance reduced​

$\mathrm{ZnO}+C\to \mathrm{Zn}+\mathrm{CO}$

Q. The reaction given below is an example of:
$Ba\left(OH{)}_2\right(s)+2CuCNS(s)\to Ba(CNS{)}_2\left(aq\right)+2CuOH\left(s\right)$

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

Q.

In __ reaction exchange of partners takes place.

Q.

$Pb\left(N{O}_3{)}_2\right(aq)+2KCl(aq)\to 2KN{O}_3(aq)+PbC{l}_2(s)$

When lead nitrate solution is mixed with potassium chloride solution, a precipitate of lead chloride and potassium nitrate solution are formed. This type of reaction is called _________________.

1. Decomposition

2. Double displacement

3. Combination

4. Displacement

Q. Which of the following represent a double displacement reaction?

1. $2\text{Mg(s)}+{\text{O}}_2\text{(g)}$$\to 2\text{MgO(s)}$
2. $2{\text{H}}_2\text{(g)}+{\text{O}}_2\text{(g)}\to$$2{\text{H}}_2\text{O(l)}$
3. ${\text{AgNO}}_3\text{(aq)}+\text{NaCl(aq)}\to \text{AgCl}\text{(s)}+{\text{NaNO}}_3\text{(aq)}$
4. $2{\text{H}}_2\text{(g)}+{\text{Cl}}_2\text{(g)}\to 2\text{HCl (g)}$

Q.

Which of the following reaction is metathesis reaction?

1. 

2. 

3. 

4. 

Q. In a double displacement reaction, _______ are exchanged between the reactants.

1. compounds
2. ions
3. molecules
4. atoms

Q. The reaction given below is an example of:
${\text{CuSO}}_4\text{(aq)}+{\text{H}}_2\text{S(g)}\to \text{CuS(s)}$ $\downarrow$ + ${\text{H}}_2{\text{SO}}_4\text{(aq)}$

1. combination reaction
2. displacement reaction
3. decomposition reaction
4. double displacement reaction

Q.

What is the colour of the product formed when the black copper oxide is heated in a steam of hydrogen?

1. Greenish red

2. Reddish brown

3. Grey

4. Pale yellow

Q. $AgN{O}_{3\left(aq\right)}+NaC{l}_{\left(aq\right)}\to AgC{l}_{\left(s\right)}+NaN{O}_{3\left(aq\right)}$.
Above reaction is a:

1. Precipitation reaction
2. Double displacement reaction
3. Combination reaction
4. (a) and (b) both