Hydrogen Displacement by Alkalis

Identify the oxidizing agent and the reducing agent in the reaction given below:

$H_{2}S\left(g\right)+B{r}_2\left(l\right)\to 2HBr\left(aq\right)+S\left(s\right)$

1. Both are oxidising agents

2. Both are reducing agents

3. $H_{2}S$ is the reducing agent and $B{r}_2$ is the oxidizing agent.

4. $H_{2}S$ is the oxidizing agent and $B{r}_2$ is the reducing agent.

Oxidation is a process that involves:

1. addition of oxygen

2. removal of oxygen

3. addition of hydrogen

4. removal of hydrogen

1. Electrolytic refining
2. Metallurgy
3. Roasting
4. Activity series

Why is removal of hydrogen oxidation?

For the reaction, PbO + H₂ → Pb + H₂O. Which of the following statements is incorrect?

1. PbO is the oxidising agent

2. H₂ is the reducing agent

3. H₂ is oxidised to H₂O

4. PbO is oxidised to Pb

Which of the following is/are oxidation reactions?

1. Hg²⁺ + 2^e- → Zn

2. Zn²⁺ + 2^e- → Zn

3. Fe²⁺ → Fe³⁺ + e^-

4. MnO₄^2- → MnO₄^- + e^-

When oxygen is added in a chemical reaction, that reaction is called reduction.

1. True
2. False

Which of the following is not true about redox reactions?

1. The substance that gets reduced is called the reducing agent.

2. In a redox reaction, oxidation and reduction happen simultaneously.

3. The substance that gets oxidized is called the reducing agent.

4. In a redox reaction, only reduction happens.

1. Carbon monoxide
2. Iron $\left(III\right)$ oxide
3. Iron
4. Oxygen

What is the term used for the reagent which causes another atom in a redox reaction to undergo oxidation, and is itself is reduced?

1. Reducing agents

2. Weak metals

3. Amphoteric oxides

4. Oxidising agents

In the iron box, solution of metal X is placed. After some days holes appeared in the box. The metal (s), X may be:

1. $\mathrm{Cu},\mathrm{Zn},\mathrm{Ag}$

2. $\mathrm{Mg},\mathrm{Al},\mathrm{Zn},\mathrm{Ni}$

3. $\mathrm{Sn},\mathrm{Pb},\mathrm{Ni}$

4. $\mathrm{Ca},\mathrm{Na},\mathrm{Mg},\mathrm{Al}$

1. $F{e}_2{O}_3$
2. $Fe$
3. $C{O}_2$
4. $CO$

1. Magnesium
2. Silver
3. Copper
4. Potassium

1. Oxidation
2. Intermolecular redox
3. Intramolecular redox
4. Reduction

Oxidation can be defined as the chemical process which involves:-

1. Addition of Oxygen

2. Removal of Hydrogen

3. Addition of Electrons

4. Removal of Electrons

Define the following term (with example).

Oxidation

Which metal gives hydrogen on heating with hot concentrated alkali?

1. Sodium

2. Nickel

3. Zinc

4. Copper

1. Mg > Na > Fe > Au
2. Mg > Fe > Na > Au
3. Na > Mg > Fe > Au
4. Na > Au > Fe > Mg

1. Magnesium
2. Silver
3. Copper
4. Potassium

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

1. K = Na = Ca

2. K > Na > Ca

3. Na > K > Ca

4. K < Na < Ca