Electrochemistry

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What is the characteristic of metals with standard reduction potential values near about – 2.0 volt or more?

They have high positive reduction potentials

They are poor reducing agents

They are strongly electropositive (correct)

They are highly electronegative

What happens to the tendency of metals to liberate hydrogen gas from dilute acids as you descend in the electrochemical series?

It becomes constant

It remains the same

It decreases (correct)

It increases

Which of the following metals can liberate hydrogen from water?

Iron and the metals above it (correct)

Copper and metals above it

Iron and metals below it

Mercury and metals below it

What is the direction of the oxidation reaction in the equation Mn → Mn⁺⁺ + ne⁻?

Left to right Signup and view all the answers

What is the relationship between the reduction potential of a metal and its ability to displace hydrogen from dilute acids?

Metals with high negative reduction potentials can displace hydrogen Signup and view all the answers

What happens to the thermal stability of the oxide of a metal as you descend in the electrochemical series?

It decreases Signup and view all the answers

What is the tendency of non-metals with high positive values of standard reduction potentials?

To accept electrons readily Signup and view all the answers

Which of the following metals is a strong reducing agent?

Al Signup and view all the answers

What is the direction of the electrochemical series?

From top to bottom, increasing tendency to lose electrons Signup and view all the answers

What is the relationship between standard free energy change and cell potential?

ΔG = -nF × Ecell Signup and view all the answers

Which of the following metals has a moderate electropositive character?

Al Signup and view all the answers

What is the oxidation reaction in the electrochemical series?

M → M+ + e- Signup and view all the answers

Which of the following metals has a more negative reduction potential?

Sodium Signup and view all the answers

What is the principle behind the extraction of metals like Ag and Au from their salt solutions?

More electropositive metals can displace less electropositive metals Signup and view all the answers

Which of the following metals is NOT an alkali or alkaline earth metal?

Zinc Signup and view all the answers

What happens when metals below copper in the electrochemical series are heated?

They form unstable oxides that decompose on heating Signup and view all the answers

Which of the following is a stronger reducing agent?

Sodium Signup and view all the answers

What is the relationship between the reduction potential of a metal and its reducing power?

More negative reduction potential means stronger reducing power Signup and view all the answers

What is the relationship between the electrochemical equivalent (Z) of an element and its equivalent weight (E)?

E is directly proportional to Z Signup and view all the answers

What is the Faraday constant (F) equivalent to?

Charge on an electron × Avogadro's number Signup and view all the answers

How many moles of electrons are required to liberate one mole of monovalent cation?

One mole of electrons Signup and view all the answers

What is the unit of Faraday constant (F)?

Coulomb per mole Signup and view all the answers

What is the number of Faraday equivalent to?

Number of electrons passed Signup and view all the answers

What type of conductors are copper, silver, and tin?

Metallic conductors Signup and view all the answers

What is the relationship between the mass of a substance deposited or liberated at an electrode and the quantity of electricity passed?

They are directly proportional Signup and view all the answers

What is the charge carried by one mole of electrons?

96,500 Coulombs Signup and view all the answers

What is the electrochemical equivalent (ECE) of an ion?

A constant that depends on the ion Signup and view all the answers

What is the relationship between the amount of electricity involved in a reaction and the number of moles of electrons involved?

Q = nF Signup and view all the answers

What is the quantity of electricity involved in a reaction when one mole of electrons is involved?

96,500 Coulombs Signup and view all the answers

What is the unit of electrochemical equivalent (ECE)?

Grams per Coulomb Signup and view all the answers

What is the unit of electrochemical equivalent?

gram per coulomb Signup and view all the answers

What is the number of electrons in 1 mole of electrons?

6.023 × 10^23 Signup and view all the answers

What is the value of Faraday's constant in Coulombs?

96500 Signup and view all the answers

What is the charge of one electron in Coulombs?

1.6 × 10^-19 Signup and view all the answers

What is the relationship between the amount of substance and the quantity of electricity passed in Faraday's law of electrolysis?

The amount of substance is directly proportional to the quantity of electricity passed Signup and view all the answers