Question : Which of the following is known as ‘Plaster of Paris’?
Option 1: 2CaSO4. 2H2O
Option 2: 2MgSO4.H2O
Option 3: 2MgSO4.7H2O
Option 4: 2CaSO4.H2O
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Correct Answer: 2CaSO4.H2O
Solution : The correct option is 2CaSO4. 2H2O.
The compound 2CaSO4·2H2O is known as Plaster of Paris. Plaster of Paris is a common name for calcium sulphate hemihydrate, and its chemical formula is exactly 2CaSO4·1/2H2O. It is widely used in construction and other applications, particularly for making moulds and casts.
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Question : The chemical formula of Gypsum is _________.
Option 1: CaSO4.12H2O
Option 2: MgSO4.12H2O
Option 3: MgSO4.2H2O
Option 4: CaSO4.2H2O
Question : The chemical formula of gypsum is ______.
Option 1: CaSO4.2H2O
Option 2: CaSO4.H2O
Option 3: CaSO4
Option 4: CaSO4.(1/2)H2O
Question : Select the sentences that contain no spelling errors.
Option 1: The hippoputamus, also known as ‘river horse’, lives throughout sub-Saharan Africa.
Option 2: The hipopotamus, also known as ‘river horse’, lives throughout sub-Saharan Africa.
Option 3: The hippopotmaus, also known as ‘river horse’, lives throughout sub-Saharan Africa.
Option 4: The hippopotamus, also known as ‘river horse’, lives throughout sub-Saharan Africa.
Question : Which of the following is known as ammonia?
Option 1: NH3
Option 2: PH3
Option 3: NO3
Option 4: NO2
Question : Which of the following is used as anesthetics?
Option 1: N2
Option 2: N2O
Option 3: CH4
Option 4: CO2
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