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प्रश्न
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
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उत्तर
Sulphur dioxide (SO2)
संबंधित प्रश्न
Give reason.
Acidic soil is treated with quick lime.
State four conditions necessary for chemical reactions to take place.
| 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 |
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
