Chemistry Question Bank

The ratio of stoichiometric coefficient of Fe2+ and MnO

What is the stoichiometric coefficient of Ca in the reaction? Ca Al Ca Al ->

Which of the following reaction is balanced? (a) AsO MnO AsO MnO 2H O -> (b) MnO C O Mn CO -> (c) 3 2 Cu 4HNO Cu(NO ) 2NO 2H O -> (d) H S HNO H O NO S -> Ans (c) Sol. In option (a), 2- - 3- AsO +MnO A…

For the redox reaction MnO4– + C2O42– + H+ ->Mn2+ + CO2 + H2O, The correct stoichiometric coefficients of MnO4– , C2O42– and H+ are respectively:

In the chemical reaction, K2Cr2O7 + XH2SO4 + YSO2 -> K2SO4 + Cr2(SO4)3 + ZH2O, X, Y and Z are

aK Cr O bKCl cH SO -> xCrO Cl yKHSO zH O The above equation balances when

When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation. o xC u yH NO Cu NO NO NO H O -> The coefficients …

I 2S O S O 2I -> In the above reaction: (CPMT 2009)

The oxidation number of C in CH2O is

Which one of the following reaction involves oxidation- reduction?

The oxidation state of Fe in Fe3O8 is

The oxidation number of C in HNC is

In which of the following processes is nitrogen oxidized? (a) NH N -> (b) NO NO -> (c) NO NO -> (d) NO NH -> Ans (a) Sol. o NH N -> Oxidation state of N = -3 Oxidation state of N = 0 In the other reaction, the oxid…

In which of the following cases is the oxidation state of N atom wrongly calculated?

In which of the following pairs is there the greatest difference is the oxidation numbers of the oxidation numbers of the central atom?

A mole of N2H4 loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation number …

MnO4 - is a good oxidizing agent in different medium changing to MnO Mn MnO MnO Mn O -> -> -> -> Changes in oxidation number respectively, are

In which of the following reactions, there is no change in valency? (a) SO 2H S 2H O 3S -> (b) 2Na O 2Na O -> (c) Na O H SO Na SO H O -> (d) 4KClO 3KClO KCl -> Ans (c) Sol. The oxidation states of central atom i…

In acidic medium, H2O2 changes Cr O to CrO5 which has two (–– O –– O –––) bonds. Oxidation state of Cr in CrO5 is (AIMPT 2014)

In which of the following compounds, nitrogen exhibits highest oxidation state? (AIPMT 2012)

A metal ion M3+ loses 3 electrons, its oxidation number will be :

Which of the following molecules has least oxidation number of central atom?

In which of the compounds does manganese exhibit highest oxidation number?

In which of the following compounds, the oxidation number of iodine is fractional?

In which of the following compounds is the oxidation state of C a fraction?