Q.1.
Which of the following metal evolves hydrogen on reacting with cold dilute HNO3? [ AIPMT 1989]
-
41%
a) Mg
-
29%
b) Al
-
18%
c) Fe
-
12%
d) Cu
Q.2.
The reaction of H2O 2 with hydrogen sulphide is an example of ...... reaction [ 1988]
-
22%
a) addition
-
39%
b) oxidation
-
33%
c) reduction
-
6%
d) acidiic
Q.3.
Which one of the following ores is best concentrated by froth floation method? [IIT 2016]
-
17%
a) Siderite
-
44%
b) Galena
-
17%
c) Malachite
-
22%
d) Magnetite
Q.4.
From the following statements regarding H2O2 choose the incorrect statement ...[IIT 2015]
-
38%
a) It can only as an oxidising agent
-
12%
b) It decomposed on exposure to light
-
19%
c) It has to be stored in plastic or wax lined glass bottles in dark
-
31%
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]
-
25%
a) CO and CO2 are produced in this process
-
38%
b) Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductiivity
-
12%
c) Al3+ is reduced at the cathod to form Al
-
25%
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
-
39%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
-
28%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
-
0%
c) Assertion is true, but Reason is false
-
33%
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]
-
7%
a) Ag
-
33%
b) Ca
-
20%
c) Cu
-
40%
d) Cr
Q.8.
Sulphide ores are common for the metals [ IIT 2013]
-
58%
a) Ag, Cu and Pb
-
17%
b) Ag, Cu and Sn
-
25%
c) Ag, Mg anda Pb
-
0%
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]
-
0%
a) O2 and CO respectively
-
67%
b) O2 and Zn dust respectively
-
33%
c) HNO3 anda Zn dust respectively
-
0%
d) HNO3 and CO respectively
Q.10.
Oxidation states of the metal in the minearls haematite and magnetite, respectively, are ..
-
9%
a) II, III in haematite and III in magnetite
-
27%
b) II, III in haematite and I in magnetite
-
18%
c) II in haematite and II, III in magnetite
-
45%
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 ...
-
9%
a) nitrogen
-
64%
b) oxygen
-
18%
c) carbon dioxide
-
9%
d) argon
Q.12.
Extraction of zinc from zinc blende is achived by
-
10%
a) electrolytic reduction
-
60%
b) roasting followed by reduction with carbon
-
20%
c) roasting followed by reduction with another metal
-
10%
d) roasting followed by self-reduction
Q.13.
Which ore contains both iron and copper
-
27%
a) Cuprite
-
0%
b) Chalcocite
-
64%
c) Chalcopyrite
-
9%
d) Malachite
Q.14.
The methods chiefly used for the extraction of lead and tin from their ores are respectively ..
-
9%
a) self-reduction and carbonn reduction
-
27%
b) self-reduction and electrolytic reduction
-
27%
c) carbon reduction and self-reduction
-
36%
d) cyanide process anad carbon reduction
Q.15.
In the process of extraction of gold , Identify the complex [X] and [Y]
-
70%
a) X = [Au(CN)2]-, Y=[Zn(CN)4]2-
-
10%
b) X = [Au(CN)4]3-, Y=[Zn(CN)4]2-
-
10%
c) X = [Au(CN)2]-, Y=[Zn(CN)6]4-
-
10%
d) X = [Au(CN)4]-, Y=[Zn(CN)4]2-
Q.16.
Which of the following process is used in extractive metallurgy of magnesium
-
44%
a) Fused salt electrolysis
-
22%
b) Self-reduction
-
22%
c) Aqueous solution electrolysis
-
11%
d) Thermite reduction
Q.17.
The chemical composition of 'slag' formed during the smelting process in the extraction of copper is
-
22%
a) Cu2O + FeS
-
33%
b) FeSiO3
-
11%
c) CuFeS2
-
33%
d) Cu2S + FeO
Q.18.
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out
-
0%
a) in the presence of NaCl
-
27%
b) in the presence of fluorite
-
55%
c) in the presence of cryolite which forms a melt with lower melting temerature
-
18%
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
-
36%
a) reduction
-
18%
b) oxidation
-
27%
c) reduction followed by oxidation
-
18%
d) oxidation followed by reduction
Q.20.
In the commerical electrochemical process if aluminium extraction, the electrolyte used is
-
9%
a) Al(OH)3 in NaOH solution
-
36%
b) an aques solution of Al2(SO4)3
-
45%
c) a molten mixture of Al2O3 and Na3AlF6
-
9%
d) a moolten mixture of AlO(OH) and Al(OH)3