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Assertion: Zone refining is an effective method for the purification of metals with high vapour pressures.
Reason: Zone refining involves the controlled evaporation of impurities from the material.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
Assertion is true, but the reason is false.
Assertion is false, but the reason is true.
Answers (1)
The assertion states that zone refining is an effective method for the purification of metals with high vapour pressures. This statement is true.
However, the reason provided to support the assertion is incorrect. Zone refining does not involve the controlled evaporation of impurities from the material. Instead, it relies on the principle of fractional crystallization to achieve purification.
In zone refining, a molten zone is created in a rod or ingot of the metal to be purified. This molten zone is slowly passed along the length of the rod, and as it moves, impurities in the metal tend to concentrate in the molten zone. By carefully controlling the movement of the molten zone, impurities are pushed to one end of the rod, resulting in a purer region. This process is repeated multiple times, resulting in the purification of the metal.
Zone refining is effective for purifying metals with high melting points and low solubility for impurities. It is commonly used for the purification of semiconducting materials and high-purity metals.
Therefore, while the assertion is true, the reason given is false. Hence, option (3) is the correct option.
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