According to classical concept, oxidation
involves -

According to modern concept, oxidation is -

Oxidation takes place with -

The reaction,
2K2MnO4
+ Cl2
 2KMnO4
+ 2KCl

is an example of

In the reaction,
3Br2 + 6CO3

2– + 3H2O 
5Br–
+ BrO3
–+ 6HCO3
–

Oxidation state of hydrogen in CaH2
is -

Oxidation number of C in CH2Cl2
is -

The oxidation number of P is + 3 in -

Which one of the following is a redox
reaction ?

Fluorine does not show positive oxidation
state due to the

The oxidation number of carbon in C12H22O11
is -

In the reaction
2Na2S2O3
+ I2
 Na2S4O6
+ 2NaI,

the oxidation state of S is -

White P reacts with caustic soda forming
PH3
and NaH2PO2

. The reaction is -

The reaction
Co(s) + Cu2+(aq)  Co2+(aq) + Cu(s) is

In the rusting of iron, iron has been-

Oxidation is defined as-

The oxidation state of iodine in 
4 6 H IO is:

In the reaction MnO4
–
+ SO3
2– + H+ 

SO4
2– + Mn2+ + H2O

In a reaction between zinc and iodine, zinc
iodide is formed, what is being oxidised-

The charge on cobalt in [Co(CN)6
]
3– is-

Which of following is not a redox change ?

Which of the following halogens always shows
only one oxidation state-

In which of the following reactions, the
underlined element has decreased its
oxidation number during the reaction ?

The compound in which oxidation state of
metal is zero-

When potassium permanganate is added to
acidulated solution of ferrous sulphate-

Which of the following examples does not
represent disproportionation ?

Which of the following is a disproportionation
reaction ?

In which of the following compounds, the
oxidation state of I-atom is highest-

The oxidation number of phosphorus in
Ba(H2PO2)2 is-

Oxidation number of Ni in Ni(CO)4
is-

H2O2

+ H2O2  2H2O + O2

is an example

of disproportionation because-

In a reaction,
H2O + C  CO + H2

The oxidation number of nitrogen in NH2OH
is-

If H2S gas is passed through a solution of
K2Cr2O7
, the colour of the solution will-

In the following reaction
4P + 3KOH + 3H2O  3KH2PO2
+ PH3

Oxygen has the oxidation state of + 2 in-

O.N. of hydrogen in KH, MgH2
and NaH

respectively would be-

In C + H2O  CO + H2

, H2O acts as-

Identify oxidising & Reducing Agent-
PbS + 4H2O2  PbSO4

+ 4H2O

Equivalent weight of oxidising agent will be-
2H2

+ O2  2H2O

Which one can act as oxidising & reducing
agent both-

Which compound can not be used as
oxidising agent-

Which compound cannot be used as
Reducing agent-

Oxidation number of nitrogen can be-

Oxidation Number of Mn can be-

Oxidation number of iodine varies from –

In the chemical reaction,
K2Cr2O7
+ XH2SO4

+ YSO2


K2SO4
+ Cr2
(SO4
)
3
+ ZH2O

X, Y and Z are –

What will be the value of x, y and z in the
following equation –
H2C2O4
+ xH2O2
 yCO2
+ zH2O

What will be the value of x, y and z in the
following equation –
x
2
+ yOH–
 O3
–
+ z
–
+ 3H2O

Cu + X  Cu (NO3
)
2
+ 2H2O + 2NO2
.

Here X is-