Double Displacement Reaction

Q.

Complete the missing components/variables given as x and y in the following reactions

(a) $Pb{(N{O}_3)}_2\left(aq\right)+2KI\left(aq\right)\to Pb{I}_2\left(x\right)+2KN{O}_3\left(y\right)$

(b) $Cu\left(s\right)+2AgN{O}_3\left(aq\right)\to Cu{(N{O}_3)}_2\left(aq\right)+x\left(s\right)$

(c) $Zn\left(s\right)+H_{2}S{O}_4\left(aq\right)\to ZnS{O}_4\left(x\right)+H_2\left(y\right)$

(d) $CaC{O}_3\left(s\right)\to xCaO\left(s\right)+C{O}_2\left(g\right)$

Q.

Balance the given equation:

Cu + H2SO4 ➡ CuSO4 + SO2 ⬆ + H2O

Q. $\text{NaOH (aq)}+\text{HCl (aq)}\to \text{NaCl (aq)}+{\text{H}}_2\text{O (l)}$

The above reaction is a:

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

Q.

Which of the following double displacement reaction?

1. $\mathrm{Pb}+{\mathrm{CuCl}}_2\to {\mathrm{PbCl}}_2+\mathrm{Cu}$

2. ${\mathrm{H}}_2+{\mathrm{Cl}}_2\to 2\mathrm{HCl}$

3. ${\mathrm{BaCl}}_2+{\mathrm{K}}_2{\mathrm{SO}}_4\to {\mathrm{BaSO}}_4+2\mathrm{KCl}$

Q. A dilute solution of sodium carbonate was added to two test tubes - one containing dilute $HCl$ (A) and the other containing dilute $NaOH$ (B). The correct observation was

1. A colourless gas liberated in test tube A.
2. A colourless gas liberated in test tube B.
3. A brown coloured gas liberated in test tube A.
4. A brown coloured gas liberated in test tube B.

Q. How to get to know the product of reactants in chemical equation.

Q.

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Δ

The above reaction is _______ reaction.

1. an endothermic

2. an exothermic

3. a displacement

4. a double displacement

Q. Which of the following is an example of double displacement reaction?
(i) $C{O}_2\left(g\right)+H_2\left(g\right)\to CO\left(g\right)+H_{2}O\left(g\right)$

(ii) $P_4{O}_{10}\left(s\right)+6H_{2}O\left(l\right)\to 4H_{3}P{O}_4\left(aq\right)$

(iii) $H_2+O_2\to H_{2}O$

(iv) $CoC{l}_2\left(aq\right)+N{a}_{2}C{O}_3\left(aq\right)\to CoC{O}_3\left(aq\right)+2NaCl\left(aq\right)$

1. (iv)
2. (i)
3. (ii)
4. (iii)

Q. Write down the equation for chemical reaction when hydrogen gas is passed over cupric oxide.

Q. Is every double displacement reaction is precipitation reaction

Q.

State the observation you would make on adding ammonium hydroxide to an aqueous solution of ferrous sulfate.

Q.

Balance the following chemical equation.

$Na+O_2\to N{a}_{2}O$

$Ca+N_2\to C{a}_3{N}_2$

$N_2+H_2\to N{H}_3$

$CaC{O}_3+HCl\to CaC{l}_2+C{O}_2+H_{2}O$

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. Decomposition Reaction
2. Combination Reaction
3. Displacement Reaction
4. Double displacement Reaction

Q.

A reaction in which exchange of radicals takes place is called ___ reaction.

Q.

Complete and balance the following chemical equa tions :

(a) $N_2+O_2\to$
(b) $H_{2}S+C{l}_2\to$
(c) $Na+H_{2}O\to$
(d) $NaCl+AgN{O}_3\to$
(e) $Zn\underset{\left(dil\right)}{+H{}_{2}SO{}_4}\to$
(f) $\underset{(aq.)}{FeS{O}_4}\underset{(aq.)}{+NaOH}\to$
(g) $Pb(N{O}_3{)}_2\stackrel{heat}{⟶}$
(h) $\underset{(aq.)}{BaC{l}_2}\underset{(aq.)}{+H_{2}S{O}_4}\to$

Q.

Define double displacement reaction and give one example of each of the following types of this reaction in which

(i) a yellow precipitate is formed.

Q.

State what you would observe when: Hydrochloric acid is added to a solution of silver nitrate.

Q. $K_{2}C{O}_3\left(aq\right)+Ca\left(OH{)}_2\right(aq)\to CaC{O}_3(s)+2KOH(aq)$

The above reaction is an example of reaction and the precipitate formed in this reaction is .

1. $KOH$
2. decomposition
3. double displacement
4. $CaC{O}_3$

Q. In a double displacement reaction, how many reactants exchange their respective ions to form new products?

1. 2

Q. Define displacement reaction with a suitable example.

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. Chloride ion
2. Iodide ion
3. Bromide ion
4. Sulphate ion

Q.

When $H_{2}S$ gas is passed through the blue solution of $CuS{O}_4$, a black precipitate of copper sulphide is obtained and the sulphuric acid formed remains in the solution. The reaction is an example of:

1. a combination reaction

2. a displacement reaction

3. a decomposition reaction

4. a double displacement reaction

Q. The reaction in which two compounds exchange their ions to form two new compounds is called:

1. a displacement reaction
2. a decomposition reaction
3. an isomerization reaction
4. a metathesis reaction

Q. An aqueous reaction in which an insoluble product is formed is called a reaction.

1. solidification
2. sublimation
3. precipitation

Q.

During a chemical change what is the deciding factor for precipitation of products?

1. Mass of the limiting reagent

2. Specific gravity of products

3. Reactivity of reactants

4. None of the choices

Q. Which of the following are exothermic processes?

(i) Reaction of water with quicklime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

1. (iii) and (iv)
2. (i) and (ii)
3. (i) and (iv)
4. (ii) and (iii)

Q. What is the reaction of calcium oxide with water?

Q. Match the following reactants with their respective reaction types:

1. Combination
2. Displacement
3. Double displacement

Q.

Select the correct answer from the choices A, B, C, and D which are given. Write only the letter corresponding to the correct answer.

Which is the correct general form for double displacement reactions?

1. AB + C ⇢ A + CB

2. A + B ⇢ AB

3. AB + CD ⇢ AD + CB

4. None of the above

Q. A substance that changes the rate of a chemical reaction without taking part in it is called as

1. Reactant
2. Product
3. Catalyst
4. Both A & B