1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal :

Fe2O3(s) + 3 CO(g) $$\rightleftharpoons$$ 2 Fe(1) + 3 CO2(g)

Using the Le Chatelier’s principle, predict which one of the following will not disturb the equilibrium ?
A
Removal of CO
B
Removal of CO2
C
Addition of CO2
D
Addition of Fe2O3
2
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Extraction of copper by smelting uses silica as an additive to remove :
A
Cu2S
B
FeO
C
FeS
D
Cu2O
3
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Sodium extract is heated with concentrated HNO3 before testing for halogens because :
A
Silver halides are totally insoluble in nitric acid.
B
Ag2S and AgCN are soluble in acidic medium.
C
S2 and CN, if present, are decomposed by conc. HNO3 and hence do not interfere in the test.
D
Ag reacts faster with halides in acidic medium.
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following ores is best concentrated by froth floatation method?
A
Siderite
B
Galena
C
Malachite
D
Magnetite
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