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प्रश्न
Give reason for the following:
Concentrated nitric acid is brown in colour.
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उत्तर
Concentrated nitric acid is brown in colour due to the presence of nitrogen dioxide formed by heating the acid.
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संबंधित प्रश्न
Explain the following:
Concentrated nitric add appears yellow when it is left standing in a glass bottle.
Explain the following:
An all-glass apparatus is used in the laboratory preparation of nitric acid.
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.
Name the Following:
Salt referred to as chile saltpeter.
Write the equations involved in Ostwald process.
Give three equations of the reaction to prove that nitric acid is an acid.
Give reason for the following:
Conc. Nitric acid renders iron passive.
What do you observe when?
Conc. HNO3 drops on the skin of a person?
Complete and balance the following equation :
Fe + HNO3(conc.) → _____________
Fill in the blank with appropriate word/words.
Aqua regia is a mixture of _______ and________
