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प्रश्न
What is the function of HCI in preparation of aqua-regia?
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उत्तर
HCI dissolves noble metals like gold and platinum. HCI with HNO3 reacts to produce nascent chlorine which reacts with gold, platinum etc. to form their respective chiorides.
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संबंधित प्रश्न
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________. (Al/Cu/Zn/Fe)
The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide
State your observation When moist starch iodide paper is introduced into chlorine gas.
Write an equation for the reaction of hydrochloric acid on the silver nitrate solution.
MnO2, PbO2 and red lead react with conc. HCl acid to liberate Cl2.
What is the common property being shown by these metal oxides?
Name the following:
Gas obtained by treating ferrous sulphide with hydrochloric acid.
Name the following:
A chemical in which gold can be dissolved.
Name the following:
A metallic oxide which reacts with hydrochloric acid to give a coloured solution.
Match the following:
| Column A | Column B |
| 1. A substance that turns moist starch iodide paper blue. | A. Ammonium sulphate |
| 2. A compound which release a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings. | B. Lead carbonate |
| 3. A solution of this compound gives dirty green precipitate with sodium hydroxide. | C. Chlorine |
| 4. A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride. | D. Copper nitrate |
| 5. A white solid which gives a yellow residue on heating | E. Ferrous sulphate |
Identify the salts P and Q from the observation given below:
When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky. When NH4OH soltion is added to the above mixture (after adding dilute HCl), it produces a white precipitate which is soluble in excess NH4OH solution.
