10-minute Quiz : Chapter 29 Simple chemical cells

Which of the following statements concerning the position of metals in the Electrochemical Series is INCORRECT?

• A. Potassium is at a higher position than aluminium.
• B. Sodium is at a higher position than calcium.
• C. Iron is at a higher position than lead.
• D. Copper is at a higher position than silver.

In which of the cells will the light bulb glow most brightly?

• A
• B
• C
• D

Which of the following statements concerning a chemical cell is correct?

• A. A chemical cell must contain a porous device.
• B. A chemical cell can be set up by dipping two identical metals in an electrolyte.
• C. A chemical cell produces electricity from chemical reactions.
• D. Mobile ions from the electrolyte flow in the external circuit.

The diagram shows a Daniell cell. Which of the following statements concerning a Daniell cell are correct?

(1) The small holes on the porous device allow the zinc ions to move out of the device.

(2) Electrons flow from the zinc rod to the copper container in the external circuit.

(3) The copper container becomes thinner when the cell has been operating for some time.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

The diagram shows a lemon cell connected to a voltmeter. Which of the following statements concerning the cell are correct?

(1) Citric acid is one of the electrolytes present in lemon.

(2) Copper is the positive electrode.

(3) The part of the iron strip in the lemon dissolves gradually.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

X and Z are metals. X(s) reacts with Z(NO₃)₂(aq) according to the following equation.

X(s) + Z²⁺(aq) → X²⁺(aq) + Z(s)

A chemical cell is set up by using X and Z as the electrodes and potassium nitrate solution as the electrolyte. Which of the following statements concerning the chemical cell must be correct?

• A. Electrons flow from X to Z in the external circuit.

• B. Electrons flow from Z to X in the potassium nitrate solution.

• C. Z dissolves gradually.

• D. The electrolyte shows a colour change.

A set-up for measuring the voltage generated by a metal couple is shown in the diagram. The digital multimeter gives a positive reading. Which of the following metals can X be?

• A. Aluminium
• B. Lead
• C. Magnesium
• D. Zinc

Refer to the set-up. Which of the following statements about the set-up is correct?

• A. The colour of CuSO₄(aq) becomes deeper when the cell has operated for some time.
• B. The salt bridge allows electrons to move between the half cells.
• C. Electrons move from Pb to Cu in the external circuit.
• D. The salt bridge can be replaced by a filter paper strip soaked with saturated NaCl(aq).

Refer to the set-up. Which of the following changes would give a higher voltage?

(1) Replace dilute hydrochloric acid with concentrated hydrochloric acid.

(2) Replace iron with lead.

(3) Replace aluminium with zinc.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Consider the following statements and choose the best answer:

1st statement

The more readily a metal loses electrons in an aqueous solution, the higher its position is in the Electrochemical Series.

2nd statement

Metals react by losing electrons from their atoms to form metal ions.

• A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
• B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement.
• C. The 1st statement is false but the 2nd statement is true.
• D. Both statements are false.