Double Displacement Reaction

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 so formed remains in the solution. The reaction is an example of

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

Q.

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 :

1. Combination reaction

2. Displacement reaction

3. Decomposition reaction

4. Double displacement reaction

Q.

A shiny - brown substance X on heating in air turns black and a new compound Y is formed. Name the substance X and black compound Y.

1. X = Fe and Y = FeO

2. X = Cu and Y = Cu(OH)₂

3. X = Cu and Y = CuO

4. X = Al and Y = AlO₃

Q.

State your observation with chemical equation :

Aqueous solution of ferrous sulphate is treated with sodium hydroxide

Q.

Give one example of each of the following

b) Miscible liquid

Q.

When a solution of Barium chloride (BaCl₂) in water is added to the aqueous solution of Sodium sulphate (Na₂SO₄) the following happens

1. A white precipitate is formed

2. A red precipitate is formed

3. The color of the solution turn blue

4. The pungent smelling gas is evolved

Q. In chromatography the filter paper is :​

1. mobile phase
2. stationary phase
3. mixture
4. None of the above

Q. What are the advantages of chromatography?​

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. Grey
3. Pale yellow
4. Reddish brown

Q.

What do you observe when:

Black copper oxide is heated with charcoal.

Q. The reaction $BaC{l}_2+H_{2}S{O}_4\to BaS{O}_4+2HCl$ is:

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

Q. Why is it named so?​

Q.

Copper reacts with Oxygen vigorously at room temperature.

1. True
2. False

Q. Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine. Identify the type of the reaction:

1. Decompostion reaction
2. None of these
3. Double Displacement reaction
4. Displacement reaction

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.

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

1. Double displacement reaction

2. Precipitation reaction

3. Combination reaction

4. (a) and (b) both

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

Q. Name the simplest type of chromatography?​

Q. What are the conditions necessary for combination reaction to take place?

Q. Lead Sulphate + Ammonium Hydroxide $\to$ Lead hydroxide + Ammonium Sulphate

1. Single displacement reaction
2. Double decomposition reaction
3. Combination reaction
4. Decomposition reaction

Q. $H_{2}S$ is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

1. oxidation of $C{u}^{2+}$
2. reduction of $C{u}^{2+}$
3. double decomposition
4. reduction and oxidation

Q. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?

Q.

Which type of reaction is represented by the chemical reaction $\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{s}\right)\to {\mathrm{MgSO}}_4\left(\mathrm{s}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$.

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. Combination

2. Decomposition

3. Displacement

4. Double displacement

Q. What will be the product formed if the following is a double decomposition reaction?
Potassium hydroxide + Hydrochloric acid $\to$

1. Water
2. No recation
3. Potassium chloride
4. Potassium Chlorate

Q. In double decomposition reaction mutual ________ (ions/atoms) are exchanged.

Q. Arrange the steps followed for separation of colours in ink using paper chromatography.

1. Dot is marked
2. Colours get separated
3. Dip in water
4. Water rises up

Q. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. What other name can be given to this precipitation reaction?

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

Q. On what principle is this method based?​

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

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