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प्रश्न
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
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उत्तर
No, a nickel spatula cannot be used to stir CuSO4 solution, because Nickel will displace copper from CuSO3 solution and Cu gets deposited on the Ni spatula.
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संबंधित प्रश्न
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
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 |
What is a chemical change? Give two examples of chemical change?
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
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].
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
