Electrode Potentials Quiz

What is the voltage of the cell represented as Zn_(s)/Zn²⁺(aq)//Cu²⁺_(aq)/Cu_(s) given that for Cu²⁺ _(aq)/Cu_(s), E^o = +0.337 V and for Zn²⁺_(aq)/Zn_(s). E^o = -0.763v?

• A. +0.426V

• B. -0.426V

• C. -0.337V

• D. -1.10V

• E. +1.10V

The reaction at the zinc anode is?

• A. addition

• B. hydrolysis

• C. oxidation

• D. hydration

• E. displacement

An arrangement of two different metals in aqueous solution of their salts to produce electric current is known as?

• A. electrochemical cell

• B. activity series

• C. thermocouple

• D. voltmeter

• E. galvanometer

The common feature of reactions at the anode is that?

• A. electrons are consumed

• B. oxidation is involved

• C. ions are reduced

• D. the electrode dissolves

• E. the electrolyte is diluted

Feasible cell was constructed by joining the two half - cell thus: Cu2+(aq) + 2e- Cu(s) Eo = +0.34V; Zn2+(aq)+ 2e- Zn(s) Eo =-0.76V what is the standard e.m.f of the cell?

• A. -1.1V

• B. -0.42V

• C. +0.42V

• D. +1.1V

Consider the cell represented below: Zn_(s)/Zn²⁺_(aq)//Cu²⁺_(aq)/Cu_(s). Which of the following statements is correct about the cell?

• A. Zn is oxidized to Zn²⁺

• B. Cu is oxidized to Cu²⁺

• C. it is an electrolytic cell

• D. Each single line represent a salt bridge.

Consider the electrochemical cell represented below. Zn_(s)/Zn²⁺_(aq)//Cu²⁺_(aq)/Cu_(s). Which of the following equations describes the reaction occurring in the cell?

• (a) Cu_(s) + Zn²⁺_(aq) → Cu²⁺_(aq) + Zn_(s)

• (b) Cu_(s) + Zn_(s) → Cu²⁺_(aq) + Zn_(s)

• (c) Zn_^(s) + Cu²⁺_(aq) → Cu_(s) + Zn²⁺_(s)

• (d) Zn²⁺_(aq) + Cu²⁺_(aq) → Zn_(s) + Cu_(s)

Which of the following statements about the cell notation Mg/Mg2+//Cu2+/Cu is correct?

• A. Copper is the anode

• B. Magnesium is reduced

• C. Magnesium is the anode

• D. The double lines represent the electrodes

Which of the following cells produces an electric current from chemical reactions?

• I. Lead acid battery

• II. Dry cell

• III. Daniel cell

• IV. Electrolytic cell

Which of the following statements about electrochemical cell is correct? Oxidation occurs?

• A. at the anode

• B. at the cathode

• C. through the salt bridge

• D. in the aqueous solution