Question : Which among the following is the most widely used method for refining impure metals?
Option 1: Vapour-Phase Refining
Option 2: Poling Refining
Option 3: Electrolytic Refining
Option 4: Liquidation Refining
Correct Answer: Electrolytic Refining
Solution : The correct answer is Electrolytic Refining.
The most widely used method for refining impure metals is electrolysis. Electrolysis involves passing an electric current through a molten or dissolved ionic compound, causing the metal ions to migrate to the electrode (cathode), where they gain electrons and are deposited as pure metal. This method is commonly used for refining metals like copper and aluminium.
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Question : Which of the following is widely used in making semiconductor chips?
Option 1: Radium
Option 2: Sodium
Option 3: Germanium
Option 4: Sulphur
Question : Which one of the following is not a method of measurement of national income?
Option 1: Value-added method
Option 2: Income method
Option 3: Investment method
Option 4: Expenditure method
Question : Which of the following statements is not correct regarding the alkali metals?
Option 1: All the alkali metals are silvery white, soft and light metals.
Option 2: The ionisation enthalpies of the alkali metals are considerably low and decrease down the group.
Option 3: Group 1 metals are known as alkali metals.
Option 4: All the alkali metals have two valence electrons.
Question : Which of the following metals is the heaviest?
Option 1: Iron
Option 2: Silver
Option 3: Nickel
Option 4: Osmium
Question : Which of the following metals has the lowest density?
Option 1: Lithium
Option 2: Iron
Option 3: Gold
Option 4: Vanadium
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