Chemistry basics questions

 

Question 1: What is the atomic number of Oxygen?

1. 6
2. 7
3. 8 ✅
4. 9

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Question 2: Which of the following is a noble gas?

1. Oxygen
2. Nitrogen
3. Hydrogen
4. Neon ✅

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Question 3: What is the formula of water?

1. CO₂
2. H₂
3. H₂O ✅
4. O₂

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Question 4: Which acid is found in lemon?

1. Hydrochloric acid
2. Citric acid ✅
3. Acetic acid
4. Formic acid

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