Oxidation Reduction Reaction

Q.

In $\mathrm{ZnO}+\mathrm{C}\to \mathrm{Zn}+\mathrm{CO}$, which substance is oxidized and reduced?

Q.

Keeping food in airtight containers helps to slow down oxidation.

1. True
2. False

Q.

Why is a combustion reaction an oxidation reaction?

Q.

In a reaction, there is removal of oxygen from one of the reactants & addition of oxygen to the other. One is oxidised and the other is reduced. Such a reaction is known as-

1. Double Displacement Reaction
2. Decomposition Reaction
3. Redox Reactions
4. All of the above

Q.

Loss of ____ is called reduction (oxygen/ electron)

Q.

Which of the following are combination reactions?

i) 4K + O₂ → 2K₂O

ii) CuSO₄ + 2NH₄OH → (NH₄)₂SO₄ + Cu(OH)₂

iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂

iv) Na₂O + H₂O → 2NaOH

1. Reactions (i) and (ii)

2. Reactions (ii) and (iii)

3. Reactions (i) and (iv)

4. Reactions (ii) and (iv)

Q.

Classify the following reaction as a combination, displacement, decomposition, or neutralization reaction.

${\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2$

Q.

What happens during oxidation and reduction ?

Q. Based on the given reaction, identify the correct statement.
$C{r}^{+}+S{n}^{4+}\to C{r}^{3+}+S{n}^{2+}$

1. is reduced
2. is oxidized.
3. is oxidized
4. None of these

Q.

The substance that brings oxidation in a chemical process and itself gets reduced is called _____.

Q. In oxidation reaction either ______ (oxygen / hydroxy) is added or hydrogen is removed.

Q.

Which statement Is correct about oxidation?

1. It is gain of oxygen

2. It is loss of hydrogen

3. It is addition of oxygen and removal of hydrogen

4. Each one of (a) , (b) and (c).

5. None of (a) , (b) and (c).

Q.

Define the term.

Reduction reaction

Q. $\begin{array}{cccc}& ReactionNames& & Reactions\\ i& Displacementreaction& & A.CaO+H_{2}O\to Ca(OH{)}_2\\ ii& DecompositionReaction& & B.Fe+Pb(N{O}_3{)}_2\to Fe(N{O}_3{)}_2+Pb\\ iii& RedoxReaction& & C.MgC{l}_2+Ca(OH{)}_2\to Mg(OH{)}_2+CaC{l}_2\\ iv& CombinationReaction& & D.2KCl{O}_3\to 2KCl+3O_2\\ v& DoubleDisplacementReaction& & E.C{O}_2+H_2\to CO+H_{2}O\end{array}$

1. B, F, E, A and C

2. A, E, F, B and C

3. A, F, E, B and C

4. B, E, F, A and C

Q.

$\begin{array}{ccc}& \text{Reaction Names}& \text{Reactions}\\ \text{i}& \text{Displacement reaction}& \text{A.}CaO+O_2\to 2Ca(OH{)}_2\\ \text{ii}& \text{Decomposition Reaction}& \text{B.}Fe+Pb(N{O}_3{)}_2\to Fe(N{O}_3{)}_2+Pb\\ \text{iii}& \text{Redox Reaction}& \text{C.}MgC{l}_2+Ca(OH{)}_2\to Mg(OH{)}_2+CaC{l}_2\\ \text{iv}& \text{Combination Reaction}& \text{D.}KCl{O}_3\to 2KCl+3O_2\\ \text{v}& \text{Double Displacement Reaction}& \text{E.}C{O}_2+H_2\to 2CO+H_{2}O\end{array}$

1. B, E, D, A and C

2. B, D, E, A and C

3. A, E, D, B and C

4. A, D, E, B and C

Q.

Are combination and synthesis reactions the same thing?

Q.

Name the types of chemical reactions.

Q. A chemical reaction in which the oxidation states of atoms are changed is known as a ___ reaction.

Q. $\text{CuO}+{\text{H}}_2\to \text{Cu}+{\text{H}}_2\text{O}$

Which of the following statement is correct regarding the given reaction ?

1. $CuO$ is being reduced and hydrogen is being oxidised
2. Both $CuO$ and $H_2$ are being reduced
3. Both $CuO$ and $H_2$ are being oxidised
4. $CuO$ is being oxidised and hydrogen is being reduced

Q.

Which of the following is a redox reaction?

1. CaO + 2HCl +

2. + 2HCl

3. CaO +

4. CaO + 2HCl +