A. Ferrous oxide
B. Hydrated ferric oxide
C. Powdered iron
D. Ferric sulphide
Related Mcqs:
- ______________ iron is produced, when molten pig iron is allowed to cool gradually?
A. White cast
B. Grey cast
C. Wrought
D. None of these - White cast iron as compared to grey cast iron is ________________?
A. More durable
B. Very brittle
C. Very hard
D. All A., B. & C. - _____________ iron is produced, when molten pig iron is chilled suddenly?
A. White cast
B. Grey cast
C. Wrought
D. None of these - The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?
A. 0.2
B. 2
C. 4
D. 8 - Containers made of high silicon cast iron (14% Si) are not suitable for the storage of ____________________?
A. Acetic acid
B. Benzoic & boric acids
C. Phosphoric acid (95%) & sulphuric acid (95%)
D. Hydrochloric acid (concentrated) - Cast iron vessels are not suitable for the storage of_________________?
A. Freon
B. H2SO4 (95%) at room temperature
C. H2SO4 (fuming)
D. Wet SO2 - An alloy of iron containing 4% carbon is called________________?
A. High carbon steel
B. Wrought iron
C. Mild steel
D. None of these - Wrought iron is ____________________?
A. High carbon iron
B. Highly resistance to acid corrosion
C. Malleable & ductile; and hence is used for chain links, hooks & couplings
D. An alloy of iron, chromium & carbon - With increase in carbide/graphite ratio in cast iron, its__________________?
A. Hardness & brittleness increases
B. Ductility decreases
C. Both A. and B.
D. Neither A. nor B. - Presence of high phosphorous in cast iron increases its____________________?
A. Fluidity
B. Melting point
C. Shrinkage
D. Tensile strength
