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NEET Chemistry MCQ
General Principles And Processes Of Isolation Of Elements Mcq Neet Chemistry
Quiz 2
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Q.1
Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [ AIPMT 1989]
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a) Mg
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b) Al
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c) Fe
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d) Cu
Explanation
Answer:(a)
Q.2
The reaction of H2O 2 with hydrogen sulphide is an example of ...... reaction [ 1988]
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a) addition
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b) oxidation
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c) reduction
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d) acidiic
Explanation
Answer:(b)
Q.3
Which one of the following ores is best concentrated by froth floation method? [IIT 2016]
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a) Siderite
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b) Galena
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c) Malachite
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d) Magnetite
Explanation
Answer:(b)
Q.4
From the following statements regarding H2O2 choose the incorrect statement ...[IIT 2015]
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a) It can only as an oxidising agent
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b) It decomposed on exposure to light
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c) It has to be stored in plastic or wax lined glass bottles in dark
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d) It has to be kept away from dust
Explanation
Answer:(a)
Q.5
In the context of the Hall-Heroult process for the extraction of Al, which of the following statement is false [ IIT 2015]
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a) CO and CO2 are produced in this process
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b) Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductiivity
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c) Al3+ is reduced at the cathod to form Al
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d) Na3AlF6 serve as the electrolyte
Explanation
Answer:(d)
Q.6
Assertion : Nitride is process of heating steel in an atmosphere of nitrogen. Reason: Steel becomes brittle after nitriding
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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)
Q.7
The metal that cannot be obtained by electrolysis of an aqueous solution of its salt is [ IIt 2014]
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a) Ag
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b) Ca
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c) Cu
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d) Cr
Explanation
Answer:(b)
Q.8
Sulphide ores are common for the metals [ IIT 2013]
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a) Ag, Cu and Pb
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b) Ag, Cu and Sn
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c) Ag, Mg anda Pb
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d) Al, Cu and Pb
Explanation
Answer:(a)
Q.9
n the cyanide extraction process of silver from argentite ore the oxidising and reducing agents used are [IIT 2012]
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a) O2 and CO respectively
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b) O2 and Zn dust respectively
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c) HNO3 anda Zn dust respectively
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d) HNO3 and CO respectively
Explanation
Answer:(b)
Q.10
Oxidation states of the metal in the minearls haematite and magnetite, respectively, are ..
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a) II, III in haematite and III in magnetite
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b) II, III in haematite and I in magnetite
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c) II in haematite and II, III in magnetite
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d) III haematite and II, III in magnetite
Explanation
Answer:(d)
Q.11
NAtive silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of ...
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a) nitrogen
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b) oxygen
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c) carbon dioxide
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d) argon
Explanation
Answer:(b)
Q.12
Extraction of zinc from zinc blende is achived by
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a) electrolytic reduction
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b) roasting followed by reduction with carbon
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c) roasting followed by reduction with another metal
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d) roasting followed by self-reduction
Explanation
Answer:(b)
Q.13
Which ore contains both iron and copper
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a) Cuprite
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b) Chalcocite
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c) Chalcopyrite
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d) Malachite
Explanation
Answer:(c)
Q.14
The methods chiefly used for the extraction of lead and tin from their ores are respectively ..
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a) self-reduction and carbonn reduction
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b) self-reduction and electrolytic reduction
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c) carbon reduction and self-reduction
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d) cyanide process anad carbon reduction
Explanation
Answer:(a)
Q.15
In the process of extraction of gold , Identify the complex [X] and [Y]
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a) X = [Au(CN)2]-, Y=[Zn(CN)4]2-
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b) X = [Au(CN)4]3-, Y=[Zn(CN)4]2-
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c) X = [Au(CN)2]-, Y=[Zn(CN)6]4-
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d) X = [Au(CN)4]-, Y=[Zn(CN)4]2-
Explanation
Answer:(a)
Q.16
Which of the following process is used in extractive metallurgy of magnesium
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a) Fused salt electrolysis
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b) Self-reduction
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c) Aqueous solution electrolysis
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d) Thermite reduction
Explanation
Answer:(a)
Q.17
The chemical composition of 'slag' formed during the smelting process in the extraction of copper is
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a) Cu2O + FeS
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b) FeSiO3
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c) CuFeS2
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d) Cu2S + FeO
Explanation
Answer:(b)
Q.18
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
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a) in the presence of NaCl
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b) in the presence of fluorite
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c) in the presence of cryolite which forms a melt with lower melting temerature
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d) in the presence of cryolite which forms a melt with higher melting temperature
Explanation
Answer:(c)
Q.19
The chemical process in the production of steel from haematite ore involve
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a) reduction
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b) oxidation
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c) reduction followed by oxidation
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d) oxidation followed by reduction
Explanation
Answer:(a)
Q.20
In the commerical electrochemical process if aluminium extraction, the electrolyte used is
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a) Al(OH)3 in NaOH solution
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b) an aques solution of Al2(SO4)3
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c) a molten mixture of Al2O3 and Na3AlF6
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d) a moolten mixture of AlO(OH) and Al(OH)3
Explanation
Answer:(c)
0 h : 0 m : 1 s
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