d) A is incorrect and R is correct.
1. Assertion (A): In Blast furnace both fire box and hearth are combined in big chamber which
accommodates both ore and fuel.
[ ]
Reason (R) : Reverberatory furnace has both fire box and hearth separated, but the vapours (flame)
obtained due to the burning of the fuel touch the ore in the hearth and heat it
a) Both A and R are correct and R is the correct explanation of A
b) Both A and R are correct and R is not correct explanation of A
c) A is correct and R is incorrect
d) A is incorrect and R is correct
Answers
Answer:
A is correct and R is incorrect
Explanation:
Argonne National Laboratory pioneered the development of pyrochemical processing, or pyroprocessing, a high-temperature method of recycling reactor waste into fuel, demonstrating it paired with the EBR-II and then proposed commercializing it in the Integral Fast Reactor, the latter which was cancelled by the Clinton ...
Answer:
(A) Cassiterite (SnO
2
) is an oxide ore of tin.
(B) Purified ore that contains 70% of SnO
2
is called black tin.
SnO
2
+2C→Sn+2CO (carbon reduction)
(C) Roasting is done at moderate temperatures in the presence of air in a reverberatory furnace. Both roasting and self-reduction are carried out in the same furnace at different temperatures.
(D) At 500−800 K (lower temperature range in the upper part of blast furnace), CO is the reducing agent.
3Fe
2
O
3
+CO→2Fe
3
O
4
+CO
2
Fe
3
O
4
+4CO→3Fe+4CO
2
Fe
2
O
3
+CO→2FeO+CO
2
At 900−1500 K (higher temperature range in the lower part of blast furnace), coke is the reducing agent.
C+CO
2
→2CO;FeO+CO→Fe+CO
2
.
Hence, the statement in option D is incorrect