Building Materials
The slag which floats on the surface of the molten iron generally contains

All listed here
Silica (SiO2) 35%
Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%
Lime (CaO) 45%

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Building Materials
A queen closer is a

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
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

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