Redox Chemistry - exam practice

A

B

C

D

HClO

Mg(OH)₂

Na₂SO₄

NH₄Cl

-2

-1

+1

+2

Cl is both oxidised and reduced

Cl is oxidised and O is reduced

O is both oxidised and reduced

O is oxidised and Cl is reduced

Cl₂ + H₂O ➔ HCl + HClO

2ClO₂ + 2NaOH ➔ NaClO₂ + NaClO₃ + H₂O

4KClO₃ ➔ 3KClO₄ + KCl

MnO₂ + 4HCl ➔ MnCl₂ + Cl₂ + 2H₂O

Cu₂O + H₂SO₄ ➔ CuSO₄ + Cu + H₂O

MgO + 2HCl ➔ MgCl₂ + H₂O

SnCl₂ + HgCl₂ ➔ Hg + SnCl₄

MnO₂ + 4HCl ➔ MnCl₂ + 2H₂O + Cl₂

NO₂⁺

ClO₃^-

H₂SO₃

PCl₅

Cl₂ + H₂ ➔ 2HCl

(CH₃)₂CO + H₂ ➔ (CH₃)₂CHOH

N₂ + 3H₂ ➔ 2NH₃

2Na + H₂ ➔ 2NaH

TiO₂ ➔ TiO₃^2-

Cr₂O₇^2- ➔ CrO₄^2-

MnO₄^2- ➔ MnO₄^-

VO₃^- ➔ VO²⁺

-2

-1

+1

+2

N

O

H

Cr

C_(s) + O_2(g) ➔ CO_2(g)

CH_4(g) + Cl_2(g) ➔ CH₃Cl_(g) + HCl_(g)

2CO_(g) ➔ CO_2(g) + C_(s)

CH₃COOH_(aq) + NaOH_(aq) ➔ CH₃COONa_(aq) + H₂O_(l)

MnO₄^- is the reducing agent and the oxidation number of Mn increases

MnO₄^- is the oxidising agent and the oxidation number of Mn decreases

NO₂^- is the reducing agent and the oxidation number of N decreases

NO₂^- is the oxidising agent and the oxidation number of N increases

H⁺ is the reducing agent and I^- is reduced

I^- is the reducing agent and H⁺ is reduced

MnO₂ is the reducing agent and I^- is reduced

I^- is the reducing agent and MnO₂ is reduced

loss of hydrogen

decrease in oxidation number

gain of electrons

loss of oxygen

H₂O₂ + 2HI ➔ 2H₂O + I₂

2CrO₄^2- + 2H⁺ ⇌ Cr₂O₇^2- + H₂O

2F₂ + O₂ ➔ 2F₂O

Na₂O + H₂O ➔ 2NaOH

phosphate(III)

phosphate(IV)

phosphate(V)

phosphate(VI)

K₂O₃

K₂O

K₂O₂

KO₂