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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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In a pure compound the mass ratio A:B is 2:5 and total mass is 28 grams. What is the mass of B?

Answer and explanation

Correct answer: 20 grams

The ratio A:B is 2:5, so the total number of parts is 2 + 5 = 7. One part has mass 28/7 = 4 g. Therefore, the mass of B, representing 5 parts, is 5 × 4 = 20 g. Choosing 16 g would represent only 4 parts for B, which does not match the given ratio. Exam tip: In ratio questions, first add the ratio parts and find the value of one part.

Related tags

ChemistryChemical CombinationMass RatioPure CompoundStoichiometryClass 11Laws Of Chemical CombinationSome Basic Concepts Of Chemistry
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10 more MCQs
  1. 1Who is commonly credited with formulating the law of conservation of mass?
  2. 2Which statement correctly describes the law of conservation of mass for a chemical reaction in a closed system?
  3. 3In which type of system can the total mass of a reacting sample be measured as remaining constant without accounting for matter exchanged with the surroundings?
  4. 4Who proposed the law of definite proportions, also known as the law of constant composition?
  5. 5What does the law of definite proportions state about a pure compound?
  6. 6In a pure sample of water, what happens to the mass ratio of hydrogen to oxygen?
  7. 7The law of multiple proportions is associated with which scientist?
  8. 8When does the law of multiple proportions apply?
  9. 9According to the law of multiple proportions, what is the ratio of the masses of one element that combine with a fixed mass of another element in different compounds?
  10. 10Who proposed the law of reciprocal proportions?
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