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प्रश्न
Name the oxide of nitrogen which turns brown on exposure to air. How is it prepared?
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उत्तर
Oxide is NO (Nitric oxide).
This turns brown (NO2).
Preparation:
(i) Nitrogen and oxygen combine in the atmosphere during lightning discharge.
\[\ce{N2 + O2 <=> 2NO}\]
(ii) By oxidation of ammonia.
\[\ce{4NH3 + 5O2 ->[Pt][800^\circ C]4NO + 6H2O + Heat}\]
संबंधित प्रश्न
Write balanced chemical equations for Action of hot and concentrated Nitric acid on copper
Explain the following:
An all-glass apparatus is used in the laboratory preparation of nitric acid.
Give two chemical equations for the following:
Reactions of nitric acid with non-metals.
The action of heat on the blue crystalline solid X gives a reddish brown gas Y, a gas which re-lights a glowing splint and leaves a black residue. When gas Z, which has a rotten egg smell, is passed through a solution of X, a black ppt. is formed.
- Identify X, Y and Z.
- Write the equation for the action of heat on X.
- Write the equation between solution X and gas Z.
How is nitric acid prepared in a laboratory?
Complete and balance the following equation :
Fe + HNO3(conc.) → _____________
Choose the correct answer from the option given below:
The catalyst used in the manufacture of HNO3 by Ostwald process is
Why does pure nitric acid take on a yellowish brown colour when exposed to light?
Explain the following:
Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid.
- Name A (a liquid), B (a solid), and C (a liquid). (Do not give the formulae.)
- Write an equation to show how nitric acid undergoes decomposition.
- Write the equation for the reaction in which copper is oxidised by concentrated nitric acid.
