Question

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the diagram below shows a set up to show the catalytic oxidation of ammonia.

(a)liquid b and solid a are used to produce oxygen gas. name a and b
a.................................................
b.................................................
(b) state the observation made in gas jar y.
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(c)write the chemical equation taking place in the conical flask.
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Explanation:

(a)

Step1: Identify substances for oxygen production

In a common laboratory setup for oxygen production without heating, hydrogen peroxide (\(H_2O_2\)) (liquid) reacts in the presence of manganese(IV) oxide (\(MnO_2\)) (solid catalyst). So, solid \(A = MnO_2\) (manganese(IV) oxide) and liquid \(B=H_2O_2\) (hydrogen peroxide).

(b)

Step1: Recall catalytic oxidation of ammonia

When ammonia (\(NH_3\)) is catalytically oxidized (in the presence of \(O_2\) and hot platinum wire as catalyst), the reaction is \(4NH_3 + 5O_2\xrightarrow{Pt,\text{ heat}}4NO+6H_2O\). Nitric oxide (\(NO\)) formed reacts with \(O_2\) in air (\(2NO + O_2=2NO_2\)). \(NO_2\) is a brown - coloured gas. So, the observation is: Brown fumes are formed.

(c)

Step1: Write the decomposition reaction of hydrogen peroxide

The chemical equation for the decomposition of hydrogen peroxide in the presence of manganese(IV) oxide (catalyst) is \(2H_2O_2(aq)\xrightarrow{MnO_2}2H_2O(l)+O_2(g)\)

Answer:

(a)
A. Manganese(IV) oxide (\(MnO_2\))
B. Hydrogen peroxide (\(H_2O_2\))

(b) Brown fumes are formed.

(c) \(2H_2O_2(aq)\xrightarrow{MnO_2}2H_2O(l)+O_2(g)\)