Building Materials
During smelting process, the combination of fuel in the furnace

Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
All listed here
Carbon dioxide with carbon forms carbon mono-oxide
Forms carbon dioxide

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Building Materials
A queen closer is a

Brick laid with its length parallel to the face or direction of wall
Brick having the same length and depth as the other bricks but half the breadth
Brick laid with its breadth parallel to the face or direction of wall
Brick with half the width at one end and full width at the other

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