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प्रश्न
Distinguish by dilute sulphuric acid.
Copper and magnesium?
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उत्तर
| Copper | Magnesium |
| Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. | Magnesium metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated Mg(II) ion together with hydrogen gas, H2. |
| Copper does not displace hydrogen from non-oxidising acids like HCl or dilute H2SO4. | Corresponding reactions with other acids such as hydrochloric acid also give the aquated Mg(II) ion. |
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
How do the following help in bringing about a chemical change?
heat.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
Define chemical reaction.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
What kind of a change is associated with decaying of a plants?
______ change results in the change of the substance.
Rusting of iron is ______.
