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Question
Assertion :Van-Arkel method is used to prepare samples of some metals. Reason: It involves the reaction of CO with metals to form volatile carbonyls that decompose on heating to give pure metal.
Read the above assertion and reason and choose the correct option regarding it.
Assertion :Van-Arkel method is used to prepare samples of some metals. Reason: It involves the reaction of CO with metals to form volatile carbonyls that decompose on heating to give pure metal.
Read the above assertion and reason and choose the correct option regarding it.
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Solution
The correct option is C Assertion is correct but Reason is incorrect
Van-Arkel method :Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form a volatile compound. TiI4 leaving behind the impurities .TiI4 is further heated to 1700K when it decomposes to give pure titanium.van-Arkel method involes use of I2 to form volatile iodide of metals which on decomposition gives pure metals.
Van-Arkel method :
Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form a volatile compound. TiI4 leaving behind the impurities .TiI4 is further heated to 1700K when it decomposes to give pure titanium.
van-Arkel method involes use of I2 to form volatile iodide of metals which on decomposition gives pure metals.
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