Sectional test

Chemistry (Prelims GS) Test 5

• 25 questions
• 20 minutes
• +1 right · −0.25 wrong
• 0 students ranked

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First questions

1. Oxygen occurs in nature in ______ isotopic forms.
2. Which one of the following statements is/ are incorrect ? a. The number of protons in a nucleus is called its atomic number. b. The total number of protons and neutrons constitute its mass number.
3. An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?