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प्रश्न
How can 68% nitric acid be concentrated to 98% nitric acid?
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उत्तर
98% nitric acid is obtained by distilling 68% nitric acid with conc. H2SO4 under reduced pressure. The function of H2SO4 is to absorb water.
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संबंधित प्रश्न
Give two chemical equations for the following:
Nitric acid showing as acidic character.
How is nitric acid prepared in laboratory?
Give reason for the following:
Conc. Nitric acid renders iron passive.
Give reason for the following :
Nitric acid usually does not yield hydrogen from acids.
Give reason for the following:
Concentrated nitric acid is a stronger oxidizing agent.
Write balanced equation and name the product formed when :
Concentrated nitric acid is heated.
What happens when (Given balanced equation):
Nitric acid is added to Kl (aq)?
Fill in the blank with appropriate word/words.
98% nitric acid is obtained by distilling 68% nitric acid with ________ under ______
Complete and balance the following equation:
Cu + HNO3 → NO2 + ________+ _________
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.
