Q.1
Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [ AIPMT 1989]
  • a) Mg
  • b) Al
  • c) Fe
  • d) Cu
Q.2
The reaction of H2O 2 with hydrogen sulphide is an example of ...... reaction [ 1988]
  • a) addition
  • b) oxidation
  • c) reduction
  • d) acidiic
Q.3
Which one of the following ores is best concentrated by froth floation method? [IIT 2016]
  • a) Siderite
  • b) Galena
  • c) Malachite
  • d) Magnetite
Q.4
From the following statements regarding H2O2 choose the incorrect statement ...[IIT 2015]
  • a) It can only as an oxidising agent
  • b) It decomposed on exposure to light
  • c) It has to be stored in plastic or wax lined glass bottles in dark
  • d) It has to be kept away from dust
Q.5
In the context of the Hall-Heroult process for the extraction of Al, which of the following statement is false [ IIT 2015]
  • a) CO and CO2 are produced in this process
  • b) Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductiivity
  • c) Al3+ is reduced at the cathod to form Al
  • d) Na3AlF6 serve as the electrolyte
Q.6
Assertion : Nitride is process of heating steel in an atmosphere of nitrogen. Reason: Steel becomes brittle after nitriding
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • d) Assertion and Reason are false
Q.7
The metal that cannot be obtained by electrolysis of an aqueous solution of its salt is [ IIt 2014]
  • a) Ag
  • b) Ca
  • c) Cu
  • d) Cr
Q.8
Sulphide ores are common for the metals [ IIT 2013]
  • a) Ag, Cu and Pb
  • b) Ag, Cu and Sn
  • c) Ag, Mg anda Pb
  • d) Al, Cu and Pb
Q.9
n the cyanide extraction process of silver from argentite ore the oxidising and reducing agents used are [IIT 2012]
  • a) O2 and CO respectively
  • b) O2 and Zn dust respectively
  • c) HNO3 anda Zn dust respectively
  • d) HNO3 and CO respectively
Q.10
Oxidation states of the metal in the minearls haematite and magnetite, respectively, are ..
  • a) II, III in haematite and III in magnetite
  • b) II, III in haematite and I in magnetite
  • c) II in haematite and II, III in magnetite
  • d) III haematite and II, III in magnetite
Q.11
NAtive silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of ...
  • a) nitrogen
  • b) oxygen
  • c) carbon dioxide
  • d) argon
Q.12
Extraction of zinc from zinc blende is achived by
  • a) electrolytic reduction
  • b) roasting followed by reduction with carbon
  • c) roasting followed by reduction with another metal
  • d) roasting followed by self-reduction
Q.13
Which ore contains both iron and copper
  • a) Cuprite
  • b) Chalcocite
  • c) Chalcopyrite
  • d) Malachite
Q.14
The methods chiefly used for the extraction of lead and tin from their ores are respectively ..
  • a) self-reduction and carbonn reduction
  • b) self-reduction and electrolytic reduction
  • c) carbon reduction and self-reduction
  • d) cyanide process anad carbon reduction
Q.15
In the process of extraction of gold , Identify the complex [X] and [Y]
ch-21_que_no-38_img_no1.png
  • a) X = [Au(CN)2]-, Y=[Zn(CN)4]2-
  • b) X = [Au(CN)4]3-, Y=[Zn(CN)4]2-
  • c) X = [Au(CN)2]-, Y=[Zn(CN)6]4-
  • d) X = [Au(CN)4]-, Y=[Zn(CN)4]2-
Q.16
Which of the following process is used in extractive metallurgy of magnesium
  • a) Fused salt electrolysis
  • b) Self-reduction
  • c) Aqueous solution electrolysis
  • d) Thermite reduction
Q.17
The chemical composition of 'slag' formed during the smelting process in the extraction of copper is
  • a) Cu2O + FeS
  • b) FeSiO3
  • c) CuFeS2
  • d) Cu2S + FeO
Q.18
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
  • a) in the presence of NaCl
  • b) in the presence of fluorite
  • c) in the presence of cryolite which forms a melt with lower melting temerature
  • d) in the presence of cryolite which forms a melt with higher melting temperature
Q.19
The chemical process in the production of steel from haematite ore involve
  • a) reduction
  • b) oxidation
  • c) reduction followed by oxidation
  • d) oxidation followed by reduction
Q.20
In the commerical electrochemical process if aluminium extraction, the electrolyte used is
  • a) Al(OH)3 in NaOH solution
  • b) an aques solution of Al2(SO4)3
  • c) a molten mixture of Al2O3 and Na3AlF6
  • d) a moolten mixture of AlO(OH) and Al(OH)3
0 h : 0 m : 1 s