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प्रश्न
Match the salts underlined in Column A with the most suitable method of preparation given in Column B.
| Column A | Column B | ||
| (a) | \[\ce{ZnCl2 \text{from} Zn}\] | 1. | Precipitation |
| (b) | \[\ce{KNO3 \text{from} KOH}\]. | 2. | Direct combination |
| (c) | \[\ce{CaCO3 \text{from} CaCl2}\]. | 3. | Displacement reaction |
| 4. | Neutralization |
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उत्तर
| Column A | Column B | ||
| (a) | \[\ce{ZnCl2 \text{from} Zn}\] | 3. | Displacement reaction |
| (b) | \[\ce{KNO3 \text{from} KOH}\]. | 4. | Neutralization |
| (c) | \[\ce{CaCO3 \text{from} CaCl2}\]. | 1. | Precipitation |
Explanation:
- Displacement Reaction
\[\ce{Zn + HCl -> ZnCl2 + H2}\]
Displace H from HCl because zinc is more reactive than hydrogen. - Neutralization Reaction
\[\ce{KOH + HNO3 -> KNO3 + H2O}\]
\[\ce{Base + Acid -> Salt + water; Neutralization reaction}\] - Precipitation Reaction
\[\ce{CaCl2 + Na2CO3 -> 2NaCl + CaCO3 ↓}\]
Sodium chloride and a clacium carbonate precipitate follow from the double displacement reaction.
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संबंधित प्रश्न
How is the following salt prepared:
Magnesium carbonate from magnesium chloride.
You are provided with the following chemicals:
NaOH, Na2CO3, H2O, Zn(OH)2, CO2, HCI, Fe, H2SO4, CI2, Zn.
Using the suitable chemicals from the given list only, state briefly how you would prepare iron (III) chloride.
Explain why It is necessary to find out the ration of reactants required in the preparation of sodium sulphate.
Choose the method of preparation of the following salts, from the methods given in the list:
[List : A. Neutralization B. Precipitation C. Direct combination D. Substitution ]
(i) Lead chloride
(ii) Iron (II) sulphate
(iii) Sodium nitrate
(iv) Iron (III) chloride
Some methods used for the laboratory preparation of salts are:
(a) Metal + acid
(b) Carbonate + acid
(c) Precipitation
(d) Direct combination
(e) Titration
Copy and complete the following table :
| Salt | Method of Preparation |
| Ammonium Sulphate | |
| Calcium carbonate | |
| Iron (III) chloride | |
| Lead nitrate | |
| Zinc sulphate |
Write equation for the laboratory preparation of the following salt, using sulphuric acid: Iron (II) sulphate from the iron.
Give the equation for the preparation of the following salt from the starting material given.
Copper sulphate from copper (II) oxide
State the inference drawn from the following observation:
Salt S is prepared by reacting dilute sulphuric acid with copper oxide Identify S.
For each of the salt: A, B, C and D, suggest a suitable method of its preparation.
A is a sodium salt.
Choose the most appropriate answer from
(SO2, SiO2, Al2O3, CO, MgO, Na2O)
An oxide which when dissolved in water form acid.
