The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
C.
A slag is an easily fusible material which is formed when gangue still present in the roasted or the calcined ore combines with the flux. For example, in the metallurgy of iron, CaO (flux) combines with silica gangue to form easily fusible calcium silicate (CaSiO3) slag.
Consider the following equation, which represents a reaction in the extraction of chromium from its ore
Which one of the following statements about the oxidation states of the substances is correct?
The iron has been reduced from +3 to + 2 state.
The chromium has been oxidised from +3 to +6 state.
The carbon has been oxidised from +2 to +4 state.
There is no change in the oxidation state of the substances in the reaction.
Dipping iron article into a strongly alkaline solution of sodium phosphate
does not affect the article
forms iron phosphate film
forms ferric hydroxide
Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?
K2[Fe(CN)6]
K2CrO4
KBr
K2SO4
The purest zinc is made by
electrolytic refining
zone refining
the van Arkel method
the Mond process