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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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In an open vessel, the measured mass appears lower after a reaction because gas escapes. What is the correct scientific conclusion?

Answer and explanation

Correct answer: The escaped gas was not included in the measurement

The measured mass is lower because the escaped gas is outside the measured system. If the gas were collected and included, the total mass would be conserved; the gas has not been destroyed.

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ChemistryConservation Of MassLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq
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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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