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A chemist poured lemon juice on soil, the idea that he may have in his mind is that

A. there may be a possibility of a chemical reaction
B. lemon juice is dangerous to health
C. lemon juice is dangerous to health
D. water should be preferred over lemon juice for drinking

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Correct Answer: A. there may be a possibility of a chemical reaction
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All of the following statements are incorrect except

A. precision and accuracy should go side by side in a scientific work
B. scientific work must be precise, accuracy is not essential
C. scientific work must be accurate, precision is not essential
D. calculations must be made before any experiment

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Correct Answer: A. precision and accuracy should go side by side in a scientific work
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Empirical formula and formula unit of an ionic compound

A. are always similar
B. are always different
C. may be similar or different
D. ionic compounds don’t’ have any empirical formula

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Correct Answer: C. may be similar or different
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Copper (II) oxide is mixed with organic compound during combustion analysis. The purpose is

A. to carry out complete combustion
B. to reduce the economy of the process
C. to reduce the time for completion of the reaction
D. all of the above

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Correct Answer: A. to carry out complete combustion
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Bismark brown is a dye. Its molar mass is 228.3 g/mol. When the dye was analyzed by a scientist, it was found that it contains 30.68% nitrogen. How many nitrogen atoms are there in each Bismark brown molecule?

A. 6
B. 5
C. 4
D. 3

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Correct Answer: B. 5
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