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1
JEE Main 2020 (Online) 2nd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Cast iron is used for the manufacture of :
A
wrought iron, pig iron and steel
B
wrought iron and pig iron
C
wrought iron and steel
D
pig iron, scrap iron and steel
2
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :
A
Mercury
B
Carbon tetrachloride
C
Zinc sulphide
D
Silicon carbide
3
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are :
(a) CaO + SiO2 $$ \to $$ CaSiO3
(b) 3Fe2O3 + CO $$ \to $$ 2Fe3O4 + CO2
(c) FeO + SiO2 $$ \to $$ FeSiO3
(d) FeO $$ \to $$ Fe + $${{1 \over 2}}$$O2
A
(a) and (d)
B
(c) and (d)
C
(a)
D
(d)
4
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :
A
liquation
B
vapour phase refining
C
distillation
D
zone refining
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