Hg
AI
Mg
Fe
`2Mg(s)+ O_( 2) (g) -> 2MgO(s)`
`S(s)+ O_( 2) (g) -> SO_(2) (g)`
`2HgO(s) overset (Heat) rightarrow 2 Hg(l) + O_( 2) (g)`
`Mg(s) + S (s) -> MgS (s)`
an acid
a base
an oxidising agent
a reducing agent
`HAsO_2(aq)`
`Sn^(2+) (aq)`
`H^(+) (aq)`
`Sn^(4+) (aq)`
Fluorine is oxidised to `F^-`
Water is oxidised to `O_2`
Water is reduced to `H^+`
Oxidation state of fluorine does not change
Hydrogen
Oxygen
Water vapour
Sulphur dioxide
Electrolytic cell
Storage cell
Primary cell
Fuel cell
+1, +5, -2
+1, +7, -2
0, 0, 0
+1, +7, 0
Oxidising agents are themselves reduced
Reducing agents gain or appear to gain electrons
Reducing agents are themselves oxidised
Oxidising agents oxidise other substances
1 and 3
2 and 4
2 and 3
1 and 4
Only 1
Only 2
Both 1 and 2
Neither 1 nor 2
Cu is more easily reduced than Ag
Ag is more easily reduced than Cu
Nitrate ion acts as an oxidising agent
Nitrate ion acts as a reducing agent
dissolved and blue colour is discharged
dissolved but blue colour is not discharged
not dissolved and blue colour is not discharged
not dissolved but blue colour is discharged
nitrate coating on silver
sulphide coating on silver
chloride coating on silver
oxide coating on silver
increases the oxidation number of an element in a given substance
decreases the oxidation number of an element in a given substance
is oxidised itself in an oxidation-reduction reaction
loses electrons in an oxidation-reduction reaction
It is a redox reaction
Metallic iron acts as a reducing agent
`O_2` acts as an oxidising agent
Metallic iron is reduced to `Fe^( 3+)`
Mercury
Copper
Silver
Tin
Sulphur (S)
Silicon (Si)
Zinc (Zn)
Phosphorus (P)
Cu > Mg > Zn > Na
Na > Zn > Mg > Cu
Cu > Zn > Mg > Na
Na > Mg > Zn > Cu
oxygen forms a protective oxide layer
it is a noble metal
iron undergoes reaction easily with water
iron forms ions
`HIO_4 < HI < ICI < I_2`
`HI < I_2 < ICI < HIO_4`
`I_2 < ICI < HIO_4 < HI`
`ICI < HIO_ 4 < HI < I`
Oxygen
Chlorine
Fluorine
Carbon
Zinc
Copper
Magnesium
Iron
`S_2O_4^(2-) < SO_3^(2-) < S_2 O_6^(2-)`
`S_2O_6^(2-) < S_2O_4^(2-) < S_O_3^(2-)`
`SO_3^(2-) < S_2O_4^(2-) < S_2O_6^(2-)`
`S_2O_4^(2-) < S_2O_6^(2-) < SO_3^(2-)`