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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
Define catalyst.
Write true or false .
A black residue is formed when sugar is heated .
Copper carbonate when heated, it turns :
Match the column in the following table.
| 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 |
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Give an example of a reaction where the following are involved
Catalyst
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
