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Questions and Answers
Which one of these is true about compounds?
Which one of these is true about compounds?
- They have the same properties as their constituent elements
- They can be broken down into other substances by chemical reactions
- They are made up of two or more elements in a fixed ratio (correct)
- They are only found in living organisms
Which one of these elements is required in very minute quantities?
Which one of these elements is required in very minute quantities?
- Carbon
- Oxygen
- Fluorine (correct)
- Calcium
Which element makes up the largest percentage of the human body by weight?
Which element makes up the largest percentage of the human body by weight?
- Carbon
- Hydrogen
- Oxygen (correct)
- Nitrogen
Which one of these elements is not mentioned as a trace element in the human body?
Which one of these elements is not mentioned as a trace element in the human body?
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Which one of these is true about species and toxic elements?
Which one of these is true about species and toxic elements?
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