Fire proof wall boards are made with gypsum because it suppresses the fire

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The gaseous water forms an inert barrier and reduces the supply of oxygen to fire

By absorbing heat for the evaporation of water produced from gypsum

By absorbing heat during conversion of dihydrate to hemihydrate

It is non inflammable, cheap and have low thermal conductivity

answer is A, B, C, D.

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Detailed Solution

In the event of fire the dehydrate will dehydrate to form the hemi hydrate and released water vapour. This reaction is endothermic $(Δ_{r} H = + 117 k J m o l^{- 1})$ So it absorbs heat from the fire. In addition, the water produced absorbs heat and evaporates and than the gaseous water provides an inert barier reducing the supply of oxygen to the fire.Oxygen is non in Hammable, cheaper and also have low thermal conductivity,