Class 10 Chemistry MCQs (Grade 10) From Textbook

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Class 10 Chemistry Competitive Exam: Certification Test 779

Climatology MCQ App & e-Book: MCQ 779

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MCQ: 779

Percentage of argon in the air is

  1. 0.78
  2. 0.21
  3. 0.0093
  4. 0.0004

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