Hydrogen Displacement by Alkalis

Q. In the reaction given below, choose the substance that is getting oxidized.
$F{e}_2{O}_3\left(s\right)+3CO\left(g\right)⟶2Fe\left(s\right)+3C{O}_2\left(g\right)$

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

Q.

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^-

Q.

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

Q.

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.

Q.

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.

Q.

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

Q.

The addition of hydrogen atoms or removal of oxygen atoms is called reduction reaction.

1. True

2. False

Q.

Which metal gives hydrogen on heating with hot concentrated alkali?

1. Sodium

2. Nickel

3. Zinc

4. Copper

Q.

When $S{O}_2$ gas is passed through saturated solution of $H_{2}S$, the following reaction occurs :

$S{O}_2$ + $2H_{2}S$ $⟶$ $2H_{2}O+3S$

Q.

(a) Give an example of an oxidation reaction.

(b) Is oxidation an exothermic or an endothermic reaction ?

(c) Exmplain, by giving an example, how oxidation and reduction proceed side by side.