Half Book 1

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1. Which yield is always less than or equal to theoretical yield?

A Actual yield

B Percentage yield

C Limiting yield

D Maximum yield

2. Which salt is used as preservative in food?

A Sodium chloride

B Copper sulfate

C Silver nitrate

D Potassium permanganate

3. Which of the following is a secondary cell?

A Dry cell

B Fuel cell

C Lead-acid battery

D Daniell cell

4. What is the SI unit for amount of substance?

A Gram

B Mole

C Liter

D Kilogram

5. Who emphasized clear definitions of elements?

A Jabir ibn Hayyan

B Boyle

C Dalton

D Rutherford

6. In the equation 2H₂ + O₂ → 2H₂O, the mole ratio of H₂ to O₂ is:

A 1:1

B 2:1

C 1:2

D 2:2

7. Which salt is used in water softening?

A Sodium carbonate

B Sodium chloride

C Calcium chloride

D Magnesium sulfate

8. In electroplating, the object to be plated is made:

A Anode

B Cathode

C Electrolyte

D Battery

9. Alchemy mainly focused on:

A Studying atoms

B Converting base metals into gold

C Measuring gases

D Writing equations

10. Robert Boyle is famous for:

A Periodic table

B Boyle’s law

C Atomic theory

D Radioactivity

Half Book 1

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