Redox Reactions

Dichromate ion is treated with base, the oxidation number of Cr in the product formed is ___________.

Identify the process in which change in the oxidation state is five :

0.4 g mixture of NaOH, Na2CO3 and some inert impurities was first titrated with \({N \over {10}}\) HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5...

The oxidation states of nitrogen in NO, NO2, N2O and NO\(_3^ -\) are in the order of :

Statement I : Sodium hydride can be used as an oxidising agent.Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.Choose the CORRECT answer from the options given below :

The compound that cannot act both as oxidising
and reducing agent is :

Oxidation number of potassium in K2O. K2O2 and KO2 respectively is :

The redox reaction among the following is :

The volume, in mL, of 0.02 M K2Cr2O7 solution
required to react with 0.288 g of ferrous
oxalate in acidic medium is _______.
(Molar mass of Fe = 56 g mol–1)

A 100 mL solution was made by adding 1.43 g
of Na2CO3.xH2O. The normality of the solution
is 0.1 N. The value of x is _____.
(The atomic mass of Na is 23 g/mol)

While titrating dilute HCl solution with aqueous
NaOH, which of the following will not be
required?

The oxidation states of transition metal atoms
in K2Cr2O7, KMnO4 and K2FeO4, respectively,
are x, y and z. The sum of x, y and z is _______.

The correct order of the oxidation states of
nitrogen in NO, N2O, NO2 and N2O3 is :

In order to oxidise a mixture of one mole of each of FeC2O4, Fe2(C2O4)3, FeSO4 and Fe2(SO4)3 in
acidic medium, the number of moles of KMnO4 required is :

50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is -

The hardness of a water sample (in terms of equivalents of CaCO3) containing 10–3 M CaSO4 is (Molar mass of CaSO4 = 136 g mol–1)

An example of a disproportionation reaction is :

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO2 is :

Which of the following reactions is an example of a redox reaction?

The volume of 0.1N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is :

In which of the following reactions H2O2 acts as a reducing agent?
1. H2O2 + 2H+ + 2e- \(\to\) 2H2O
2. H2O2 - 2e- \(\to\) O2 + 2H+
3. H2O2 + 2e- \(\to\) 2OH-
4. H2O2 + 2OH- - 2e- \(\to\) O2 + 2H2O

Consider the following reaction:
\(xMnO_4^- + yC_2O_4^{2-}\) + zH+ \(\to\) xMn2+ + 2yCO2 + \({z \over 2}{H_2}O\)
The value's of x, y and z in the reaction are, respectively :

Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?

Which of the following is a redox reaction ?