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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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Which statement shows correct experimental understanding of conservation of mass?

Answer and explanation

Correct answer: In a closed system, the total mass of reactants and products, including any gas formed, remains the same

According to the law of conservation of mass, the total mass before and after a chemical reaction remains the same in a closed system. Any gas formed is a product and its mass must be included in the total. In an open vessel, the measured mass of the vessel may appear to decrease if gas escapes, but the law is not false; the gas has left the system. Exam tip: in reactions involving gases, first check whether the system is open or closed.

Related tags

Conservation Of MassClosed SystemChemical ReactionsGaseous ProductsClass 11 ChemistryLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry
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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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