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प्रश्न
State the use of aqua-regia.
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उत्तर
It is used to dissolve noble metals like gold and platinum.
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संबंधित प्रश्न
State one relevant observation for given reactions:
Action of dilute Hydrochloric acid on iron (II) sulfide.
Write balanced chemical equations to show The behavior of H2SO4 as an acid when it reacts with Magnesium
The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide
Write a balanced equation for the action of dilute hydrochloric acid on sodium sulphide.
Dry hydrogen chloride gas can be collected by ________ displacement of air. (downward / upward)
Name an element which reacts with hydrogen to form a compound which is strongly acidic in water.
Explain why dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%.
Write the balanced equation for the reaction of dilute hydrochloric acid with the following:
Iron
Write observation:
Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
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.
