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Which material is used to provide a basic lining to a furnace?

1. Calcined dolomite
2. Limestone
3. Haematite
4. Silica

Correct answer: Calcined dolomite

Solution

A basic lining for a furnace is provided by calcined dolomite (CaO.MgO), which is basic and resists basic slag. Silica is an acidic lining; haematite is an iron ore, not a lining material.

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