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प्रश्न
Name the following:
A chemical in which gold can be dissolved.
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उत्तर
Gold can be dissolved in aqua regia which is mixture of three parts of conoentrated hydrochloric acid and one part of concentrated nitric acid.
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संबंधित प्रश्न
Potassium sulfite on reacting with hydrochloric acid releases _______ gas. (Cl2, SO2, H2S)
Name the following:
Gas obtained by treating ferrous sulphide with hydrochloric acid.
Fill in the blank:
On addition of silver nitrate to hydrochloric acid ___________ precipitate is formed which is soluble in ____________
A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:
| S. No. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | _________ | _________ |
| 2. | Magnesium ribbon | _________ | _________ |
| 3. | Manganese (IV) oxide with heating | _________ | _________ |
| 4. | Sodium sulphide | _________ | _________ |
Complete the table by writing the gas evolved in each case and its odour.
What is the property of concentrated sulphuric acid (H2SO4) which allows it to be used in the preparation of hydrogen chloride (HCl) and nitric acid (HNO3)?
Give a chemical test to distinguish between the following pair of compounds:
Sodium chloride solution and sodium nitrate solution.
Write the balanced equation for the reaction of dilute hydrochloric acid with the following:
Iron
State your observation when:
Decomposition of bicarbonates by dil. H2SO4
2NaHCO3 + H2SO4 → Na2SO4 + 2H2O + 2CO2
2KHCO3 + H2SO4 → K2SO4 + 2H2O + 2CO2
A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution :
| S.NO. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | ______ | ______ |
| 2. | Magnesium ribbon | ______ | ______ |
| 3. | Manganese (IV) oxide with heating | ______ | ______ |
| 4. | Sodium sulphide | ______ | ______ |
Complete the table by writing the gas evolved in each case and its odour.
State which of the two - a solution of HCl in water or in toluene is an electrolyte. Explain.
