Displacement Reactions

Q.

A zinc plate was put into a solution of copper sulphate kept in a glass tumbler. It was found that a blue colour of the solution gets fader and fader with the passage of time . After a few days when zinc plate was taken out, a no. of holes were found .

(i) state the reason for the change in the plate

Q.

Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.

Q. When a piece of lead $\left(\text{Pb}\right)$ is left in blue coloured copper sulphate solution $\left({\text{CuSO}}_4\right)$, the colour of lead changes due to copper deposition. What type of reaction is this?

1. Displacement reaction
2. Combination reaction
3. Neutralization reaction
4. Decomposition reaction

Q.

We can store CuSO₄ in silver vessel but not in silver nitrate why explain

Q.

When iron fillings are added to a blue coloured copper sulphate solution, what colour change would you observe in solution?

1. No change

2. Red

3. Green

4. Orange

Q. What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.

Q. Why can not each metal react to its own salt (Eg. Cu and CuSO4) ?

Q.

A copper coin was kept in silver nitrate solution for a few days. what will happen to the copper coin and what will happen to the colour of the solution write the balanced equation

Q. Why can't copper displace iron from copper sulphate solution?

Q.

As seen in the figure, two nails are carefully dipped in copper sulphate solution with the help of threads. What will happen when the nails are removed after half an hour?

1. No change is observed

2. Nails turn blue in colour

3. Nails turn green in colour

4. Nails turn brown in colour

Q. Which of the following non-metals reacts and catches fire on exposure to air?​

1. sulphur
2. hydrogen
3. phosphorus
4. nitrogen

Q.

An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain?

Q. Question 53
Look at the figure and answer the following questions.

(a) What change would you observe in the calcium Hydroxide solution taken in tube B?

(b) Write the reaction involved in test tube A and B respectively

(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?

(d) How can a solution of lime water be prepared in the laboratory?

Q. Question 35
Which of the following can undergo a chemical reaction?
(a) ${\text{MgSO}}_4+\text{Fe}$
(b) ${\text{ZnSO}}_4+\text{Fe}$
(c) ${\text{MgSO}}_4+\text{Pb}$
(d) ${\text{CuSO}}_4+\text{Fe}$

Q. 30. What is displacement reaction ?

Q. Choose the reactions which are not feasible.
I. Iron + Zinc sulphate $\to$ Iron sulphate + Zinc
II. Magnesium + Silver nitrate $\to$ Magnesium nitrate + Silver
III. Copper + dil. sulphuric acid $\to$ Copper sulphate + $H_2$
IV. Zinc + Ferrous sulphate $\to$ Iron + Zinc sulphate

1. I, II and III
2. III and IV only
3. I and III only
4. All of these

Q. In the refining of silver, the recover of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

Q. Which of the following metals will satisfy the given reaction?
$\text{M(s) +}$ $\text{PbCl}$${}_2\left(aq\right)$ $\to$ $\text{Pb(s) +}$ $\text{MCl}$${}_2\left(aq\right)$

i. Mg; ii. Ag; iii. Zn; iv. Fe

1. i and ii
2. i, ii and iv
3. iii and iv
4. i, iii and iv

Q.

In the following reaction, identify the products X and Y.
$Cu+FeS{O}_4\to X+Y$

1. $X-Fe;Y-Cu$

2. $X-Fe;Y-CuS{O}_4$

3. $X-FeS{O}_4;Y-CuS{O}_4$

4. Reaction cannot happen

Q.

In the given reaction: Metal A + Salt solution of Metal B $\to$ Salt solution of Metal A + Metal B
Metal B has higher reactivity than metal A.

1. False

2. True

Q. A and B are two different metals.
A + salt of B $\to$ B+ salt of A
So, metal A ismetal B

1. less reactive than
2. more reactive than
3. as reactive as

Q. A and B are two different metals.
A + salt of B $\to$ B+ salt of A
So, metal A ismetal B

1. less reactive than
2. more reactive than
3. as reactive as

Q. Write an activity about how you conduct an experiment to show that more reactive metals replace less reactive metals from their compounds.

Q. Study the flowchart and identify P, Q, R, and A. ​

Q.

Copper can be displaced by:

1. Silver

2. Gold

3. Mercury

4. Iron

Q. ${\text{Fe}}_2{\text{O}}_3+2\text{Al}\to {\text{Al}}_2{\text{O}}_3+2\text{Fe}$
The above reaction is an example of a:

Q. Which of the following metals will satisfy the given reaction?
$\text{M(s) +}$ $\text{PbCl}$${}_2\left(aq\right)$ $\to$ $\text{Pb(s) +}$ $\text{MCl}$${}_2\left(aq\right)$

i. Mg; ii. Ag; iii. Zn; iv. Fe

1. i and ii
2. i, ii and iv
3. iii and iv
4. i, iii and iv

Q. A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?

Q. The displaced element formed when iron reacts with copper sulphate solution.

1. copper
2. sulphur
3. oxygen
4. None of these

Q. ${\text{Fe}}_2{\text{O}}_3+2\text{Al}\to {\text{Al}}_2{\text{O}}_3+2\text{Fe}$
The above reaction is an example of a: