Displacement Reaction

Q.

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light, or electricity.

Q.

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Q.

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Q.

(a) Write two observations when lead nitrate is heated in a test tube.

(b) Name the type of reaction.

(c) Write the balanced chemical equation to represent the above reaction.

Q.

What happens when dilute sulphuric acid is added to zinc granules? Select the correct option.

1. Water and zinc sulphate is formed

2. Hydrogen gas and zinc sulphide is formed

3. No reaction takes place

4. Hydrogen and zinc sulphate is formed

Q.

Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?

Q. Which amongst the following can be observed when zinc granules are added to dilute hydrochloric acid taken in a test tube?

1. The colour of the solution turns yellow
2. A pungent smelling gas is liberated
3. Small bubbles are formed
4. No change takes place

Q.

When barium chloride solution is added to copper sulphate solution a white precipitate is produced along with copper chloride solution. Name the type of reaction involved.

Q.

What happens when a piece of silver metal is added to copper sulfate solution? Also, write the balanced chemical equation if the reaction occurs

Q.

The figure represents the reactivity of metals then which of the following are correct?

(i) Sodium is more reactive than magnesium.

(ii) Magnesium ad aluminium metals displace lead.

(iii) Magnesium and aluminium metals displace calcium.

(iv) Iron and tin metals can displace magnesium.

(v) Most reactive metal is sodium.

(vi) Gold is least reactive.

(vii) Calcium and zinc metals displace iron.

1. (i), (ii), (v), (vi)

2. (ii), (iii), (vi), (vii)

3. (i), (ii), (vi), (vii)

4. (ii), (v), (vi), (vii)

Q.

Write the balanced chemical equations for the following reactions.
(A) Calcium hydroxide + Carbon dioxide → Calcium carbonate + water
(B) Zinc + Silver nitrate → Zinc nitrate + Silver
(C) Aluminium + copper chloride → Aluminium chloride + Copper
(D) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride.

Q. write any three differences between displacement and double displacement reactions

Q.

Write the chemical reaction for the reaction of dilute sulphuric acid with aluminium powder.

Q. Question 1

Which of the following pairs will give displacement reactions?

a) $\text{NaCl}$ solution and copper metal
b) ${\text{MgCl}}_2$ solution and aluminum metal
c) ${\text{FeSO}}_4$ solution and silver metal
d) ${\text{AgNO}}_3$ solution and copper metal

Q.

What are the essential conditions for rusting to take place?

Q.

Hydrogen gas is not evolved when metals react with_______.

Q. Assertion(A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas.

Reason(R) : Zinc is more reactive than hydrogen.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true.

Q.

What happens when zinc granules are heated with sodium hydroxide solution?

Q.

Collector used in froth floatation process is :

1. Methyl xanthate

2. Ethyl xanthate

3. Xanthyl methanoate

4. Ethyl methyl xanthate

Q. How is acetylene prepared in the laboratory?
(a) Draw diagram
(b) Give an equation
(c) How is pure dry gas collected?

[3 MARKS]

Q.

Identify the type of reaction.

$\mathrm{Zn}+{\mathrm{FeSO}}_4\to {\mathrm{ZnSO}}_4+\mathrm{Fe}$

Q.

Which one of the following is not a method of concentration of ores?

1. Gravity separation

2. Froth floatation process

3. Electromagnetic separation

4. Smelting

Q.

The figure represents the reactivity of metals then which of the following are correct?

1. Sodium is more reactive than magnesium.
2. Magnesium and aluminium metals displace calcium.
3. Iron and tin metals can displace magnesium.
4. Silver and copper metals displace lead.

Q.

In the extraction of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the respective reaction.

Q.

What happens when iron is dipped in conc. ${\mathrm{HNO}}_3$?

Q.

Give your observation along with equation:

When copper rod is placed in silver nitrate solution

Q.

When zinc metal react with dilute sulphuric acid produces which gas .

Write the chemical equation of the above reaction

Q.

When a strip of red-brown metal X is placed in a colourless salt solution $YN{O}_3$ then metal Y is set free and a blue coloured salt solution $X(N{O}_3{)}_2$ is formed. The liberated metal Y forms a shining white deposit on the strip of metal X.

(a) What do you think metal X is ?

(b) Name the salt $YN{O}_3$.

(c) What could be metal Y ?

(d) Name the salt $X(N{O}_3{)}_2$.

(e) what type of reaction takes place between metal X and salt soultion $YN{O}_3$ ?

Q. Question 2.2

Write the balanced equation for the following chemical reaction:

Barium chloride + Aluminium sulphate $\to$ Barium sulphate + Aluminium chloride

Q. How would you separate gold from a mixture of gold and copper filing?