Question : What is the percentage composition of the element of H2SO3?
Option 1: 2.5% of H, 58.5% of S, 39% of O
Option 2: 33% of H, 16% of S, 51% of O
Option 3: 58.5% of H, 39% of S, 2.5% of O
Option 4: 2.5% of H, 39% of S, 58.5% of O
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Correct Answer: 2.5% of H, 39% of S, 58.5% of O
Solution : The correct option is 2.5% H, 39% S, 58.5% O.
Molar mass of H2SO3 = (2 x 1 g/mol) + (1 x 32 g/mol) + (3 x 16 g/mol) = 82 g/mol.
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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
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 : The major use of sulphur is in the manufacture of
Option 1: H2SO4
Option 2: H2S
Option 3: SO2
Option 4: Fungicide
Question : What is the product formed when CH3CH2OH reacts with O2?
Option 1: H2O+ heat
Option 2: CO2 + H2O + heat and light
Option 3: CO2 + H2O
Option 4: CO2 + heat and light
Question : The chemical formula of Gypsum is _________.
Option 1: CaSO4.12H2O
Option 2: MgSO4.12H2O
Option 3: MgSO4.2H2O
Option 4: CaSO4.2H2O
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