Question : The working of a dry cell is based on
Option 1: Decomposition reaction
Option 2: Spontaneous oxidation-reduction reaction
Option 3: Combination reaction
Option 4: Electrolysis
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Correct Answer: Electrolysis
Solution : The correct option is Electrolysis.
The two quantitative laws known as Faraday's laws of electrolysis are used to express the magnitudes of electrolytic effects. According to the laws (I), the amount of chemical change brought about by current at an electrode-electrolyte boundary is proportional to the amount of electricity used and (II) the amounts of chemical changes brought about by the same amount of electricity in various substances are proportional to their equivalent weights.
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Question : The reaction between an acid and a base to give a salt and water is called______.
Option 1: neutralisation reaction
Option 2: combination reaction
Option 3: displacement reaction
Option 4: decomposition reaction
Question : The reaction between an acid and a base is known as _________.
Option 1: condensation reaction
Option 2: substitution reaction
Option 3: oxidation reaction
Option 4: neutralisation reaction
Question : Copper is refined by
Option 1: Roasting
Option 2: Oxidation
Option 3: Electrolysis
Option 4: Zone refining
Question : Biogas is formed through:
Option 1: fermentation
Option 2: oxidation
Option 3: aerobic respiration
Option 4: reduction
Question : Combustion of a candle is an
Option 1: photochemical reaction
Option 2: physical change
Option 3: endothermic reaction
Option 4: exothermic reaction
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