Advertisements
Advertisements
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 |
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
How is the following salt prepared:
Copper (II) sulphate from copper (II) oxide?
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.
Explain hydronium ion. Write the ionization of sulphuric acid showing the formation of hydronium ion.
State how would you prepare copper (II) oxide from
copper sulphate
Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain:
(i) Sodium sulphate
(ii) Copper sulphate
(iii) Iron (II) sulphate
(iv) Zinc carbonate
| Dilute sulphuric acid |
Copper, Iron, |
Copper carbonate, Sodium carbonate |
Write the balanced equation for the preparation of the following compounds, starting from iron and other substance:
Iron (II) sulphate
Write the equation for the laboratory preparation of sodium sulphate using dilute sulphuric acid.
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?
Mention the colour changes observed when the following indicators are added:
| Solution | Acids | Alkalies |
| (a) Alkaline phenolphthalein solution | ||
| (b) Methyl orange solution | ||
| (c) Neutral litmus solution |
Select the word/s given which are required to correctly complete the blanks.
When solution M and O are mixed together, the products will be ______ and ______.
