Question : 'Plaster of Paris' is made by partial dehydration of
Option 1: epsom salt
Option 2: gypsum salt
Option 3: blue vittriol
Option 4: green vitriol
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Correct Answer: gypsum salt
Solution : The correct answer is gypsum salt.
Plaster of paris is formed by the partial dehydration of gypsum. Gypsum has a chemical formulae CaSO4. 2H2O which on partial dehydration gives CaSO4. 1/2 H2O. It is a white powder which forms quick setting plaster after the addition of water. It is used for making casts and moulds for statues. It is also used for making fire proofing materials, chalks and in bone fractures.
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Question : The chemical name of ''Plaster of Paris" commonly used for setting broken bones is
Option 1: Calcium nitrate
Option 2: Calcium sulphate
Option 3: Calcium carbonate
Option 4: Calcium chloride
Question : Which of the following is an ore of Aluminium?
Option 1: Galena
Option 2: Cryolite
Option 3: Cinnabar
Option 4: Epsom Salt
Question : Which of the following are food preservatives?
Option 1: Salt, sodium nitrite, spices, and vinegar
Option 2: Gypsum, soda, and methyl alcohol
Option 3: Gypsum, salt and, Formic acid
Option 4: Formic acid, vinegar, and Methyl alcohol
Question : Iodized salt is beneficial for:
:
Option 1: lowering a blood pressure
Option 2: prevention of dehydration
Option 3: thyroid function
Option 4: salivary gland
Question : Cement is made hard with
Option 1: Dehydration
Option 2: Hydration and dissociation of water
Option 3: Dissociation of water
Option 4: Polymerisation
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