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NEET Chemistry MCQ
General Principles And Processes Of Isolation Of Elements Mcq Neet Chemistry
Quiz 3
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Q.1
The major role of fluorspar (CaF2) which is added in small amount in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6 is
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a) as a catalyst
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b) to make the fused mixture very conducting
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c) to increase the temperature of the melt
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d) to decrease the rate of oxidation of carbon at the anode
Explanation
Answer:(b)
Q.2
Hydrogen gas will not reduce
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a) heated curic oxide
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b) heated ferric oxide
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c) heated stannic oxide
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d) heated aluminium oxide
Explanation
Answer:(d)
Q.3
In the alumino-thermite process, aluminiium acts as
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a) an oxidising agent
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b) a flux
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c) a reducing agent
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d) a solder
Explanation
Answer:(c)
Q.4
Type of bonds present in CuSO4.5H2O are only
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a) electrovalent and covalent
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b) electrovalent and coordinate covalent
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c) electrovalent, covalent and coordinate covalent
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d) covalent and coordinate covalent
Explanation
Answer:(c)
Q.5
Assertion : Ethyl xanthate is used as collector in froth floatation process. Reason: Collector depress the floatation property of one of the components of the ore and thus help in the separation of different minerals present in the same ore
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a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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c) Assertion is true, but Reason is false
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d) Assertion and Reason are false
Explanation
Answer:(c)
Q.6
Iron is renderd passive by treatment with concentrated
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a) H2SO4
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b) H3PO4
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c) HCl
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d) HNO3
Explanation
Answer:(d)
Q.7
Assertion: Calcium is extracted by the electrolysis of fused CaCl2 Reason: Addition of CaF2 increases the fusioon temerature of the electrolyte
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a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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c) Assertion is true, but Reason is false
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d) Assertion and Reason are false
Explanation
Answer:(d)
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