Let's begin by balancing the chemical equations provided and then classify each reaction into its appropriate class.
c) Balancing the equation:
Unbalanced equation:
\[ \text{FeS} + \text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \]
Balanced equation:
\[ \text{FeS} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \]
Classification:
This reaction is a double displacement reaction (or double replacement reaction) because the anions and cations switch partners.
d) Balancing the equation:
Unbalanced equation:
\[ \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \]
Balanced equation:
\[ 2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O} \]
Classification:
This reaction is a combustion reaction because it involves the burning of a hydrocarbon (C₂H₆, ethane) in the presence of oxygen to produce carbon dioxide and water.
e) Balancing the equation:
Unbalanced equation:
\[ \text{NO} + \text{O}_2 \rightarrow \text{NO}_2 \]
Balanced equation:
\[ 2\text{NO} + \text{O}_2 \rightarrow 2\text{NO}_2 \]
Classification:
This reaction is an oxidation-reduction (redox) reaction as nitrogen monoxide (NO) is being oxidized to nitrogen dioxide (NO₂).
Summary:
- c) Balanced: \(\text{FeS} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S}\) | Type: Double displacement
- d) Balanced: \(2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O}\) | Type: Combustion
- e) Balanced: \(2\text{NO} + \text{O}_2 \rightarrow 2\text{NO}_2\) | Type: Oxidation-reduction (redox)