Mohr’s salt, also known as ferrous ammonium sulfate, has the chemical formula:
\[ (NH_4)_2Fe(SO_4)_2 \cdot 6H_2O \]
It contains iron in the +2 oxidation state (\( \text{Fe}^{2+} \), ferrous ion).
Ferrous ions (\( \text{Fe}^{2+} \)) are susceptible to oxidation in the presence of oxygen, particularly at elevated temperatures. The oxidation reaction is:
\[ 4Fe^{2+} + O_2 + 4H^+ \rightarrow 4Fe^{3+} + 2H_2O \]
This leads to the formation of ferric ions (\( \text{Fe}^{3+} \)), which can create impurities in the Mohr’s salt and alter its composition and properties.
Prolonged heating accelerates the oxidation of \( \text{Fe}^{2+} \) to \( \text{Fe}^{3+} \) by increasing the reaction rate with oxygen in the air. To preserve the desired composition of Mohr’s salt and prevent the formation of ferric compounds, prolonged heating is avoided.
Prolonged heating of Mohr’s salt is avoided to minimize the oxidation of ferrous ions (\( \text{Fe}^{2+} \)) to ferric ions (\( \text{Fe}^{3+} \)).
Ferrous ammonium sulfate is a green crystalline solid commonly used as a reducing agent in various chemical reactions. It is sensitive to oxidation, particularly when subjected to prolonged heating.
The oxidation reaction is represented as:
\[ 4FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O + O_2 \rightarrow 2Fe_2(SO_4)_3 \cdot (NH_4)_2SO_4 + 12H_2O \]
This reaction is exothermic, releasing a significant amount of heat, which further drives the reaction forward.
To prevent oxidation and the formation of ferric ammonium sulfate, prolonged heating of ferrous ammonium sulfate is avoided.
Answer: A
A bob of mass \(m\) is suspended at a point \(O\) by a light string of length \(l\) and left to perform vertical motion (circular) as shown in the figure. Initially, by applying horizontal velocity \(v_0\) at the point ‘A’, the string becomes slack when the bob reaches at the point ‘D’. The ratio of the kinetic energy of the bob at the points B and C is:
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