Which of the following is a redox reaction?

3Mg (s) + 2AlCl 3 (aq) → 2Al (s) + 3MgCl 2 (aq)

SiO 2 (s) + 2NaOH (aq) → Na 2 SiO 3 (aq) + H 2 O (l)

KCl (aq) + AgNO 3 (aq) → AgCl (s) + KNO 3 (aq)

2NaHCO 3 (aq) → Na 2 CO 3 (aq) + CO 2 (g) + H 2 O (l)

What is the oxidation half-equation in the redox reaction? 2S 2 O 3 2– (aq) + I 2 (aq) → S 4 O 6 2– (aq) + 2I – (aq)

2S 2 O 3 2– (aq) → S 4 O 6 2– (aq) + 2e –

I 2 (aq) + 2e – → 2I – (aq)

2I – (aq) → I 2 (aq) + 2e –

S 4 O 6 2– (aq) + 2e – → 2S 2 O 3 2– (aq)

Which of the following is not a redox reaction?

CH 3 COOH(aq) + NaOH(aq) → CH 3 COONa(aq) + H 2 O(l)

CH 4 (g) + Cl 2 (g) → CH 3 Cl(g) + HCl(g)

Consider the above half-equations: Which statement is correct for the reaction between KMnO 4 (aq) and KI (aq) in acidic conditions?

I – reduces MnO 4 – to Mn 2+ .

MnO 4 – reduces I – to I 2 .

The colour changes from brown to purple.

MnO 4 – is oxidized to Mn 2+ .

Which is a correct statement for the reaction below? 2MnO 4 - (aq) + 6H + (aq) + 5NO 2 - (aq) → 2Mn 2+ (aq) + 5NO 3 - (aq) + 3H 2 O(l)

MnO 4 - is the oxidizing agent and the oxidation number of Mn decreases.

MnO 4 - is the reducing agent and the oxidation number of Mn increases.

NO 2 - is the reducing agent and the oxidation number of N decreases.

NO 2 - is the oxidizing agent and the oxidation number of N increases.

Which represents a redox reaction?

NaH(s)+H 2 O(l)→NaOH(aq)+H 2 (g)

CuCl 2 (aq)+K 2 S(aq)→CuS(s)+2KCl(aq)

HCl(aq)+NH 3 (aq)→NH+4CL − (aq)

Which represents a redox reaction?

NaH(s)+H 2 O(l)→NaOH(aq)+H 2 (g)

CuCl 2 (aq)+K 2 S(aq)→CuS(s)+2KCl(aq)

HCl(aq)+NH 3 (aq)→NH+4Cl −( aq)

Which is a redox reaction?

Zn(s) + 2HCl(aq) → ZnCl 2 (aq) + H 2 (g)

[Cu(H 2 O 4 ] 2+ (aq) + 4Cl − (aq) → [CuCl 4 ] 2− (aq) + 4H 2 O(l)

Ag + (aq) + Cl − (aq) → AgCl(s)

2K 2 CrO 4 (aq) + 2HCl(aq) → K 2 Cr 2 O 7 (aq) + H 2 O(l) + 2KCl(aq)

Which statement is correct for the following reaction? 2ClO 3 − (aq) + SO 2 (aq) + H + (aq) → 2ClO 2 (g) + HSO 4 − (aq)

ClO 3 − is the oxidizing agent and it undergoes reduction.

ClO 3 − is the reducing agent and it undergoes oxidation.

SO 2 is the oxidizing agent and it undergoes oxidation.

SO 2 is the reducing agent and it undergoes reduction.

What are the correct names for KMnO 4 and K 2 Cr 2 O 7 , using oxidation numbers?

Potassium manganate(VII) and potassium dichromate(VI)

Potassium permanganate and potassium dichromate

Potassium manganate(IV) and potassium chromate(VII)

Potassium permanganate(IV) and potassium dichromate(VII)

Consider the following reaction. Sn(s)+4HNO 3 (aq)→SnO 2 (s)+4NO 2 (g)+2H 2 O(g) Which statement is correct?

Sn is the reducing agent because the oxidation number of tin changes from 0 to +4.

HNO 3 is the oxidizing agent because it undergoes oxidation.

HNO 3 is the reducing agent because the oxidation number of nitrogen changes from +5 to +4.

Sn is the oxidizing agent because it undergoes reduction.

Which statement is correct about a reducing agent?

It is oxidized by losing electrons.

It is reduced by gaining electrons.

It is oxidized by gaining electrons.

It is reduced by losing electrons.

Which statement describes a reducing agent?

It is oxidized and loses electrons.

It is reduced and gains electrons.

It is reduced and loses electrons.

It is oxidized and gains electrons.

Consider the following reaction. 2Cr(OH) 3 (s) + 6ClO − (aq) → 2CrO 4 2− (aq) + 3Cl 2 (g) + 2OH − (aq) + 2H 2 O(l) Which statement is correct?

ClO − is the oxidizing agent and the oxidation number of chlorine changes from +1 to 0.

Cr(OH) 3 is the oxidizing agent and the oxidation number of chromium changes from +3 to +6.

Cr(OH) 3 is the reducing agent and undergoes reduction.

ClO − is the reducing agent and the oxidation number of chlorine changes from –1 to 0.

Consider the following reaction: 3(aq) + Cr 2 O 7 2− (aq) + 2H + (aq) → 2Cr 3+ (aq) + 3SnO 2( s) + H 2 O(l) Which statement is correct?

Sn 2+ is the reducing agent because it undergoes oxidation.

Sn 2+ is the oxidizing agent because it undergoes oxidation.

Cr 2 O 7 2− is the oxidizing agent because it undergoes oxidation.

Cr 2 O 7 2− is the reducing agent because it undergoes oxidation.

What happens to the manganese in the following reaction? 2MnO 4 − (aq) + 5H 2 O 2 (aq) + 6H + (aq) → 2Mn 2+ (aq) + 8H 2 O(l) + 5O 2 (g)

It is reduced and its oxidation number decreases.

It is oxidized and its oxidation number increases.

It is oxidized and its oxidation number decreases.

It is reduced and its oxidation number increases.

What happens to iodine when iodate ions, IO 3 − , are converted to iodine molecules, I 2 ?

It undergoes reduction and its oxidation number changes from +5 to 0

It undergoes reduction and its oxidation number changes from −1 to 0

It undergoes oxidation and its oxidation number changes from −1 to 0

It undergoes oxidation and its oxidation number changes from +5 to 0

Topic 9 Redox

Quiz

•

Science

•

11th - 12th Grade

•

Practice Problem

•

Hard

Used 20+ times

FREE Resource

86 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

The following occurs when metal X is added to Y sulfate solution and Z sulfate solution. (X, Y and Z represent metal elements but not their symbols.)
X (s) + YSO₄ (aq) → XSO₄ (aq) + Y (s)
X (s) + ZSO₄ (aq): no reaction
What is the order of increasing reactivity?

X < Y < Z

Y < X < Z

Z < Y < X

Z < X < Y

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which is the species oxidized and the oxidizing agent in the reaction?
MnO₂ (s) + 4HCl (aq) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

A

B

C

D

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which species contains nitrogen with the highest oxidation state?

NO₃⁻

NO₂⁻

NO₂

N₂O

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which compound contains sulfur with an oxidation state of +6?

SO₂

H₂S

H₂SO₃

H₂SO₄

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which is correct for the reaction?
P₄ (s) + 3H₂O (l) + 3OH⁻ (aq) → PH₃ (g) + 3H₂PO₂⁻ (aq)

A

B

C

D

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which represents a reduction?

SO₃ to SO₄²⁻

Mn₂O₃ to MnO₂

H₂O₂ to OH⁻

CrO₄²⁻ to Cr₂O₇²⁻

7.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which equation shows oxygen undergoing reduction?

2F₂ + O₂ → 2F₂O

Na₂O + H₂O → 2NaOH

H₂O₂ + 2HI → 2H₂O + I₂

2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O

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Topic 9 Redox

86 questions

The following occurs when metal X is added to Y sulfate solution and Z sulfate solution. (X, Y and Z represent metal elements but not their symbols.)
X (s) + YSO₄ (aq) → XSO₄ (aq) + Y (s)
X (s) + ZSO₄ (aq): no reaction
What is the order of increasing reactivity?

Which is the species oxidized and the oxidizing agent in the reaction?
MnO₂ (s) + 4HCl (aq) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

Which species contains nitrogen with the highest oxidation state?

Which compound contains sulfur with an oxidation state of +6?

Which is correct for the reaction?
P₄ (s) + 3H₂O (l) + 3OH⁻ (aq) → PH₃ (g) + 3H₂PO₂⁻ (aq)

Which represents a reduction?

Which equation shows oxygen undergoing reduction?

Which coefficients correctly balance this redox equation?
aFe²⁺(aq) + MnO₄⁻(aq) + bH⁺(aq) →
cFe³⁺(aq) + Mn²⁺(aq) + dH₂O(l)

Which element has the same oxidation number in both species?

Which can describe oxidation?

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Topic 9 Redox

86 questions

The following occurs when metal X is added to Y sulfate solution and Z sulfate solution. (X, Y and Z represent metal elements but not their symbols.)X (s) + YSO4 (aq) → XSO4 (aq) + Y (s)X (s) + ZSO4 (aq): no reactionWhat is the order of increasing reactivity?

Which is the species oxidized and the oxidizing agent in the reaction?MnO2 (s) + 4HCl (aq) → MnCl2 (aq) + Cl2 (g) + 2H2O (l)

Which species contains nitrogen with the highest oxidation state?

Which compound contains sulfur with an oxidation state of +6?

Which is correct for the reaction?P4 (s) + 3H2O (l) + 3OH− (aq) → PH3 (g) + 3H2PO2− (aq)

Which represents a reduction?

Which equation shows oxygen undergoing reduction?

Which coefficients correctly balance this redox equation?aFe2+(aq) + MnO4−(aq) + bH+(aq) → cFe3+(aq) + Mn2+(aq) + dH2O(l)

Which element has the same oxidation number in both species?

Which can describe oxidation?

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The following occurs when metal X is added to Y sulfate solution and Z sulfate solution. (X, Y and Z represent metal elements but not their symbols.)
X (s) + YSO₄ (aq) → XSO₄ (aq) + Y (s)
X (s) + ZSO₄ (aq): no reaction
What is the order of increasing reactivity?

Which is the species oxidized and the oxidizing agent in the reaction?
MnO₂ (s) + 4HCl (aq) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

Which is correct for the reaction?
P₄ (s) + 3H₂O (l) + 3OH⁻ (aq) → PH₃ (g) + 3H₂PO₂⁻ (aq)

Which coefficients correctly balance this redox equation?
aFe²⁺(aq) + MnO₄⁻(aq) + bH⁺(aq) →
cFe³⁺(aq) + Mn²⁺(aq) + dH₂O(l)