CBSE
For the redox reaction
The correct coefficients of the reactants for the balanced equation are
H+ | ||
16 | 5 | 2 |
MnO4- | C2O42- | H+ |
2 | 5 | 16 |
MnO4- | C2O42- | H+ |
5 | 16 | 2 |
MnO4- | C2O42- | H+ |
2 | 16 | 5 |
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
zero to +1 and zero to -5
zero to -1 and zero to +5
zero to -1 and zero to +5
zero to -1 and zero to +5
For the formation of Cr2O3 and Al2O3, values of are 540 kJ mol-1 and -827 kJ mol-1 respectively. What will be the possibility for reaction of Cr2O3 by Al?
Reduction of Cr2O3 by Al will take place
Oxidation of Cr2O3 by Al will take place
Neither oxidation nor reduction will take place
Reaction is not feasible
(I)H2O2 +O3 --> H2O +2O2
(II) H2O2 +Ag2O +--> 2Ag +H2O +O2
Role of hydrogen peroxide in the above reaction is respectively
oxidising in (I) and reducing (II)
reducing (I) and oxidizing in (II)
reducing in (I) and (II)
reducing in (I) and (II)
Which of the following statements is incorrect regarding the reaction?
CH3CHO + [Ag(NH3)2] + OH- CH3COO- + Ag
The equivalent weight of CH3CHO is 22
Three moles of OH- are required in the above D reaction
CH3CHO is an oxidising agent
Reduction of [Ag(NH3)2] occurs
The value of n in
Mn + 8H+ + ne- Mn2+ + 4H2O is
5
4
2
3
when I- is oxidised by MnO4- in an alkaline medium I- converts into
IO3-
I2
IO4-
IO-
In which of the following compounds, nitrogen exhibits highest oxidation state?
N2H4
NH3
N3H
N3H
When KMnO4 acts as an oxidising agent and ultimately forms Mn MnO2, Mn2O3 and Mn2+ then the number of electrons, transferred in each case respectively are
1, 3, 4, 5
3, 2, 1, 4
1, 5, 3, 7
4, 3, 2, 1
A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes a maximum change in the oxidation number?
S
H
Cl
Cl