Unit#3: Stoichiometry + Unit#4: Electrochemistry

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1. A metal higher in electrochemical series is:

A Less reactive

B More reactive

C Neutral

D Non-metal

2. One mole of any substance contains how many particles?

A 6.02 × 10^22

B 6.02 × 10^21

C 6.02 × 10^23

D 6.02 × 10^24

3. The electrical chemical series arranges elements according to:

A Atomic number

B Atomic mass

C Standard electrode potential

D Valency

4. Electrolysis of molten sodium chloride produces:

A Sodium and chlorine

B Sodium hydroxide

C Hydrogen and oxygen

D Chlorine only

5. A battery is made up of:

A One cell

B Two or more cells

C Only electrodes

D Only electrolyte

6. Percentage yield is calculated using which formula?

A (Actual/Theoretical) × 100

B (Theoretical/Actual) × 100

C Actual + Theoretical

D Actual − Theoretical

7. Which formula is used for dilution?

A M = m/V

B M₁V₁ = M₂V₂

C n = m/M

D PV = nRT

8. Which term refers to unused reactant left after reaction?

A Limiting reactant

B Excess reactant

C Product

D Catalyst

9. Percentage yield can be greater than 100% if:

A Reaction is incomplete

B Product is impure

C Limiting reactant is less

D No side reactions occur

10. Which yield is used to measure efficiency of a reaction?

A Actual yield

B Theoretical yield

C Percentage yield

D Limiting yield

Unit#3: Stoichiometry + Unit#4: Electrochemistry

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