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प्रश्न
Give two chemical tests to distinguish between dilute nitric acid and hydrochloric acid.
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उत्तर
| Dilute nitric acid | Dilute hydrochloric acid |
| 1. On reacting copper metal with nitric acid brown fumes of nitrogen dioxide. \[\ce{Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O}\] |
1.On treating copper metal with HCl We don't observe any reaction. |
|
2. Brown ring test : Nitric acid in a test tube is taken and then and then freshly prepared ferrous sulphate solution is added. Concentrated H2SO4 is then added carefully down the sides of the test tube, dark brown ring is formed at the juctions of two layers. \[\ce{FeSO4 + NO + 5H2O -> \underset{\text{Hydrated nitrosoferrous Sulphate (brown ring)}}{[Fe(No)(H2O)5]SO4}}\] |
2. No brown ring test is observed in the caseof hydrochloric acid. |
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संबंधित प्रश्न
Write a balanced equation and name the products formed when zinc reacts with dilute nitric acid.
How will you prepare the following from nitric acid?
Ferric nitrate
How will you prepare the following from nitric acid?
Aqua regia
- Name the process used for the manufacture of nitric acid.
- What are the reactants required for it and what are their sources?
- In which ratio reactants are taken in this process?
- Name the catalyst used in the process.
- What is the oxidizing agent in this process?
- Write the equations involved.
What do you observe when?
Conc. HNO3 drops on the skin of a person?
What do you observe when?
Scrap zinc is heated with conc. HNO3?
During a thunderstorm, the rainwater contains nitric acid. The nitric acid is formed as a result of three chemical reactions. Describe or write balanced chemical equation for these three reactions.
Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.
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.
A dilute acid B does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper. Identify B. Write the equation with copper.
