Reactivity Series

Q.

Complete the following reaction and balance it:

${\mathrm{Al}}_2{\mathrm{O}}_3+\mathrm{NaOH}\to$

Q.

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

Q.

When zinc granules are added to copper sulphate solution then solution becomes colourless.

1. True

2. False

Q.

Zinc sulfate forms a colorless solution in water. The colour obtained when copper is added is?

Q.

Balance each one of the following chemical equations:

$\mathrm{Zn}{\left({\mathrm{NO}}_3\right)}_2\to \mathrm{ZnO}+{\mathrm{NO}}_2+{\mathrm{O}}_2$

Q.

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Q.

The reaction of sodium chloride with bromine gas is a chemical displacement reaction.

1. True
2. False

Q.

From the knowledge of activity series, name a metal which shows the following properties

(i) It reacts readily with cold water

(ii) It displaces hydrogen from hot water

(iii) It displaces hydrogen from dilute HCI

(iv) It forms a base which is insoluble in water.

Q.

Hydrogen is evolved when dilute HCl reacts with magnesium , but nothing happens in the case of mercury and silver. Explain.

Q.

Which one of the following metals does not react with water at any conditions?

1. Gold

2. Lead

3. Potassium

4. Iron

Q.

Which is most electropositive element among the following:-

1. Aluminium
2. Sodium
3. Calcium
4. Copper

Q.

Why Iron (|||) chloride is acidic while sodium carbonate is basic. Explain

Q. Why is Concentrated Sulphuric acid not used as a drying agent to dry Hydrogen gas?

Q.

Name the type of the reaction between quick lime and water giving calcium hydroxide.

Q.

Zinc granules were added to Zinc Sulphate, Copper Sulphate, Aluminium Sulphate and Iron Sulphate solutions as shown below. You would observe the deposition of metal on Zinc in beakers:

1. I and III

2. II and IV

3. I and II

4. III and IV

Q. Which of these reactions releases hydrogen gas?

1. $Na+HCl\to$
2. $N{a}_{2}C{O}_3+HCl\to$
3. $NaHC{O}_3+HCl\to$
4. $NaOH+HCl\to$

Q. Arrange the following metals in the decreasing order of their reactivity.

1. $K$
2. $Na$
3. $Ca$
4. $Mg$
5. $Fe$

Q.

Which of the following are salient features of the activity series?

1. Electropositive character reduces down the series

2. A salt of a metal higher up in the series is displaced by lower metal

3. Reducing power of metals decreases down the group

4. The tendency of metal to lose electrons decreases down the group.

Q.

Write the balanced chemical equation for the following reaction and identify the type of reaction:
Zinc carbonate(s) → zinc oxide(s) + Carbon dioxide(g)

Q.

When iron is added to copper sulphate solution then resultant reaction occur is a type of:-

1. Decomposition reaction

2. Displacement reaction

3. Neutralisation reaction

4. Combination reaction

Q.

Which is the correct order of rate of reactivity of metals to water?

1. Na > K > Ca

2. K = Na = Ca

3. K < Na < Ca

4. K > Na > Ca

Q.

Hydrochloric acid is used to purify

1. rice

2. rubber

3. metals

4. table salt

Q. Abhinav a class 9 student arranged the given setup to study the reactivity of some metals with water .he summerised his observations as follows:

1.In test tube p, there was no reaction in cold water but when th etest tube was heated for a while bubles of gas was seen.
2.In test tube Q, bubbles of gas were formed only after boiling the water .
3.In test tube R, no gas was produced even on boiling the water.
4.In test ube S, reaction occured vigirously.

The metals present in P, Q, R, S could be respectively

A.Na, Mg, Zn, Fe
B.Na, Mg, Al, Cu
C.Mg, Zn, Cu, Na
D.Mg, Zn, Fe, Al

Q. Copper oxide is heated with hydrogen to form copper metal & water. Identify the oxidising agent.

1. Hydrogen
2. Copper
3. Water
4. Copper oxide

Q. What happens when a piece of zinc metal is added to copper sulphate solution?

1. Decomposition reaction
2. Displacement reaction
3. Double displacement reaction
4. Precipitation reaction

Q.

Hydrogen will not reduce

1. Heated cupric oxide

2. Heated ferric oxide

3. Heated stannic oxide

4. Heated aluminium oxide

Q.

Potassium is not used for preparation of hydrogen from water . Why?

Q. When a piece of sulphur is burnt in air, it disappears. Which gas is formed?

1. $S{O}_2$
2. $S{O}_3$
3. $H_{2}S{O}_2$
4. $S{O}_4$

Q.

Is that possible to store Copper sulphate solutions in a Zinc pot?

Q. Question 3(ii)
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows:
$\begin{array}{ccccc}Metal& Iron\left(II\right)sulphate& Cooper\left(II\right)sulphate& Zincsulphate& Silvernitrate\\ A.& Noreaction& Displacement& & \\ B.& Displacement& & Noreaction& \\ C.& Noreaction& Noreaction& Noreaction& Displacement\\ D.& Noreaction& Noreaction& Noreaction& Noreaction\end{array}$
Use the Table above to answer the following questions about metals A, B, C and D.
(ii) What would you observe if B is added to a solution of copper (II) sulphate?