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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
Name the gas evolved when the following mixtures are heated.
Sodium Nitrite and Ammonium Chloride
Ammonia is used in the Ostwald process.
Why is quartz used in this process?
How will you prepare the following from nitric acid?
Magnesium nitrate
Name the following :
Gas produced in air during lighting.
Describe the Ostwald's process for the manufacture of nitric acid with labeled diagram.
Fill in the blank with appropriate word.
Furning nitric acid is obtained by dissolving an excess of _______ in conc. Nitric acid
Account for the yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.
Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
What would you observe in the following case:
Copper is heated with concentrated nitric acid in a hard glass test tube.
X, Y and Z are three crystalline solids that are soluble in water and have a common anion.
To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).
- A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.
INFERENCE 1: The common anion is the ______ ion. - When X is heated, it melts and gives off only one gas which re-lights a glowing splint.
INFERENCE 2: The cation in X is either ______ or ______. - The action of heat on Y produces a reddish-brown gas and yellow residue which fuses with a glass of the test tube.
INFERENCE 3: The metal ion present in Y is the ______ ion. - When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.
INFERENCE 4: Z contains the ______ cation. - Write the equations for the following reactions:
- X and concentrated sulphuric acid (below 200°C). (One equation only for either of the cations given in INFERENCE 2)
- The action of heat on Y.
- Concentrated nitric acid is added to copper turnings kept in a beaker.
