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1
JEE Main 2021 (Online) 24th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which of the following ore is concentrated using group 1 cyanide salt ?
A
Sphalerite
B
Malachite
C
Siderite
D
Calamine
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The element that can be refined by distillation is :
A
gallium
B
nickel
C
zinc
D
tin
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The incorrect statement is :
A
bronze is an alloy of copper and tin
B
cast iron is used to manufacture wrought iron
C
german silver is an alloy of zinc, copper and nickel
D
brass is an alloy of copper and nickel
4
JEE Main 2020 (Online) 5th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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An Ellingham diagram provides information about :
A
the temperature dependence of the standard Gibbs energies of formation of some metal oxides
B
the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals
C
the conditions of pH and potential under which a species is thermodynamically stable
D
the kinetics of the reduction process
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