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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 |
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
Distinguish between the given pairs of compounds using the test given within brackets:
A lead salt and a zinc salt (using excess ammonium hydroxide)
What kind of salt prepared by direct combination. Write an equation for the reaction that takes place in preparing the salt you have named.
How is the following salt prepared:
Magnesium carbonate from magnesium chloride.
The following is a list of methods for the preparation of salts.
A – direct combination of two elements
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salt by giving a suitable equation in the following case:
Anhydrous ferric chloride.
Give the preparation of the salt shown in the left column by matching with the methods given in the right column. Write a balanced equation for each preparation.
| Salt | Method of preparation |
| Zinc Sulphate | Precipitation |
| Ferrous sulphide | Oxidation |
| Barium Sulphate | Displacement |
| Ferric sulphate | Neutralisation |
| Sodium sulphate | Synthesis |
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
Choosing the correct words given in brackets, complete the sentence given below: Copper sulphate from copper.
The preparation of lead sulphate from lead carbonate is a two step process (lead sulphate cannot be prepared by adding dilute sulphuric acid to lead carbonate)
What is the first step that is required to prepare lead sulphate from lead carbonate?
Name the method used for preparation of the following salts from the list given below:
(i) Sodium nitrate
(ii) Iron (III) chloride
(iii) Lead chloride
(iv) Zinc sulphate
(v) Sodium hydrogen sulphate
List :
(a) Simple displacement
(b) Neutralization
(c) Decomposition by acid
(d) Double decomposition
(e) Direct synthesis
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 sodium sulphate.
