Chemistry-
General
Easy
Question
Assertion:Gold is recovered from its solution containing aurocynaide complex by adding zinc dust.
Reason:Zinc is more electropositive than gold.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If both assertion and reason are true but reason is not the correct explanation of the assertion.
- If assertion is true but reason is false.
- If the assertion and reason both are false.
The correct answer is: If both assertion and reason are true and the reason is the correct explanation of the assertion.
is recovered from the solution by the addition of electropositive metal.
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Assertion:Lead, tin and bismuth are purified by liquation method.
Reason:Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion:Lead, tin and bismuth are purified by liquation method.
Reason:Lead, tin and bismuth have low m.p. as compared to impurities.
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Reason:Addition of cryolite and fluorspar lowers the fusion temperature and increases the conductivity of the electrolyte.
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Assertion:Leaching is a process of reduction.
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Assertion:Coke and flux are used in smelting.
Reason:The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.
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Assertion:Zinc is used and copper is not used in the recovery of 
from the complex 
Reason:Zinc is a powerful reducing agent than copper.
Assertion:Zinc is used and copper is not used in the recovery of from the complex
Reason:Zinc is a powerful reducing agent than copper.
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Reason:
and 
bonds can be broken with equal ease in
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Reason: and bonds can be broken with equal ease in
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Method used for obtaining highly pure silicon used as a semiconductor material is
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Zone refining is a technique used primarily for which one of the following process
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Pb and Sn are extracted from their chief ore by
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Which process of reduction of mineral to the metal is suited for the extraction of copper from its ores with low copper content
Which process of reduction of mineral to the metal is suited for the extraction of copper from its ores with low copper content
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