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प्रश्न
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
What do you observe when iron nail is kept in copper sulphate solution for sometime.
FILL IN THE BLANK
Negatively charged ions are called ..........
What do you observe when :
an iron nail is kept in tap water for few days
Write true or false :
Hydrogen sulphide has rotten egg smell .
Balancing a chemical equation is based on
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
What do you observe? When
Water is added to the quick lime.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Write some materials prepared by chemical changes.
Which is used as a catalyst during the process of hydrogenation of oils?
Write the characteristics of chemical change.
