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Question: Answered & Verified by Expert
5 moles of AB2 weigh 125×10-3 kg and 10 moles of A2B2 weigh 300×10-3 kg . The molar mass of A (MA) in kg mol-1 are:
ChemistrySome Basic Concepts of ChemistryJEE MainJEE Main 2019 (12 Apr Shift 1)
Options:
  • A MA=5×10-3 and MB=10×10-3
  • B MA=25×10-3 and MB=50×10-3
  • C MA=50×10-3 and MB=25×10-3
  • D MA=10×10-3 and MB=5×10-3
Solution:
2714 Upvotes Verified Answer
The correct answer is: MA=5×10-3 and MB=10×10-3

Mass of 1 mole of AB2=125×10-3kg5=125 gm5
=25gm

Similarly, mass of 1 mole of A2B2=300×10-3kg10=30gm

Let molar mass of A  is x and B is y

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