Double Displacement Reaction

Q.

Which among the following is(are) double displacement reaction(s)? (i) $\mathrm{Pb}+{\mathrm{CuCl}}_2\to {\mathrm{PbCl}}_2+\mathrm{Cu}$ (ii) ${\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{BaCl}}_2\to {\mathrm{BaSO}}_4+2\mathrm{NaCl}$ (iii) $\mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2$ (iv) ${\mathrm{CH}}_4+2{\mathrm{O}}_2\to {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O}$

1. (i) and (iv)

2. (ii) only

3. (i) and (ii)

4. (iii) and (iv)

Q.

When carbon dioxide gas is passed through lime water then:

1. calcium hydroxide is formed.

2. yellow precipitate of calcium oxide is formed.

3. white precipitate of calcium oxide is formed.

4. white precipitate of calcium carbonate is formed.

Q.

(a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride ?

(b) Write the balanced chemical equation for the reaction which takes place.

(c) State the physical conditions of reactants in which the reaction will not take place.

(d) Name the type of chemical reaction which occurs.

(e) Give one example of another reaction which is of the same type as the above reaction.

Q. Examples for precipitate reaction

Q.

Write the balanced chemical equations for the given reactions: Copper sulphate on treatment with potassium iodide precipitates cuprous iodide$\left({\mathrm{Cu}}_2{\mathrm{I}}_2\right)$, liberates iodine gas and forms potassium sulphate.

Q.

State the observation you make by adding ammonium hydroxide to the aqueous solution of aluminum chloride.

Q.

A metal X forms a water soluble salt $XN{O}_3$. When an aqueous solution of $XN{O}_3$ is added to common salt solution, then a white precipitate fo compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrohloric acid.

(a) What is metal X ?

(b) What is salt $XN{O}_3$ ?

(c) Name the compound Y.

(d) Write the chemical equation of the reaction which takes place on reacting $XN{O}_3$ solution an common salt solution giving the physical states of all the reactants and products.

(e) What type of chemical reaction is illustrated by the above equation ?

Q. Question 2

Give an example of a double displacement reaction other than the one given in Activity 1.10.

Q. Why is double displacement reaction also known as precipitation reaction ?

Q. Give reason : Double displacement reaction takes place only in aqueous medium.

Q.

What is the color of barium sulfate precipitate in the reaction of barium chloride and sodium?

Q.

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are:

1. X = Fe, Y = Fe₂O₃

2. X = Ag, Y = Ag₂S

3. X = Cu, Y = CuO

4. X = Al, Y = Al₂O₃

Q.

On mixing aqueous solution of silver nitrate and sodium chloride, a white precipitate of ______ is formed along with sodium nitrate. This is an example of ________ reaction.

Q.

What is the colour of the freshly prepared ${\mathrm{FeSO}}_4$ solution?

Q.

Dilute acids like hydrochloric acid (HCl), sulphuric acid $H_{2}S{O}_4$ react with certain active metals to evolve hydrogen gas and form their metallic salts.

1. True

2. False

Q.

A red-brown metal X forms a salt $XS{O}_4$. When hydrogen sulphide gas is passed through an aqueous solution of $XS{O}_4$, then a black precipitate of XS is formed alongwith sulphuric acid solution.

(a) What could the salt $XS{O}_4$ be ?

(b) What is the colous of salt $XS{O}_4$ ?

(c) Name the black precipitate XS.

(d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.

(e) What type of chemical reacion takes place in this case ?

Q. When potassium iodide (KI)solution is added to a solution of lead (II) nitrate $\left(Pb\right(N{O}_3{)}_2)$ in a test tube, a precipitate is formed. _________ is the colour of the precipitate, _________ is the type of reaction involved in this.

1. Yellow
2. Green
3. Displacement Reaction
4. Double Displacement Reaction

Q.

An aqueous solution of lead acetate is treated with an aqueous solution of potassium iodide when a precipitate is obtained.

Write the balanced chemical equation for the reaction.

Q. Give an example of a double displacement reaction.

Q.

What is the difference between evolution of gas and change in temperature

Q.

What is the result when Copper(||)oxide is heated?

Q. All double displacement reactions are not precipitation reactions. But are all the precipitation reactions double displacement reactions?

Q. Which among these will have the highest heat of neutralisation?

1. $N{H}_{4}OHandC{H}_{3}COOH$
2. $N{H}_{4}OHandHCl$
3. $NaOHandC{H}_{3}COOH$
4. $NaOHandHCl$

Q.

You are given the following materials:

1. Marble chips
2. Dilute Hydrochloric acid
3. Zinc granules

Identify the type of reaction when marble chips and Zinc granules are added separately to acid taken in two tubes. Write chemical equations in each case.

Q.

$\mathrm{Pb}\left(\mathrm{S}\right)+{\mathrm{CuSO}}_4\left(\mathrm{Aq}\right)\to {\mathrm{PbSO}}_4\left(\mathrm{Aq}\right)+\mathrm{Cu}\left(\mathrm{S}\right)$. The reaction is an example of ______ reaction.

Q.

Dilute solution of ammonium hydroxide is added to aqueous solution of ferrous sulphate and ferrous hydroxide is formed. What type of reaction is this? Write chemical equation.[2 MARKS]

Q.

Consider the reaction :

$KBr\left(aq\right)+AgN{O}_3\left(aq\right)$ $⟶$ $KN{O}_3\left(aq\right)+AgBr\left(s\right)$

This is an example of :

(a) decomposition (b) combination reaction

(c) double displacement reaction (d) displacement reaction

Q.

Can a double displacement reaction be a redox reaction?___(Yes or No)

Q.

Give examples of double displacement reactions

Q.

Reema took $5\mathrm{ml}$ of Lead nitrate solution in a beaker and added approximately $4\mathrm{ml}$ Potassium iodide solution to it. What would she observe?