Chemistry Question Bank

In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from (NEET 2022)

Which of the following reactions are disproportionation reactions? (i) 2Cu Cu Cu -> (ii) 3MnO 4H 2MnO MnO 2H O -> (iii) 2KMnO K MnO MnO O -> (iv) 2MnO 3Mn 2H O 5MnO 4H -> Select the correct option fr…

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

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…

The oxidant which cannot act as a reducing agent is

An element that never has a positive oxidation state in any of its

The oxidation number S in Na2S4O6 is

The oxidation number of P in Mg2P2O7 is

The oxidation number of Pr in Pr6O11 is

Oxidation number of Cl in CaOCl2 (bleaching powder) is

For the reaction, H PO NaOH NaH PO H O -> What is the equivalent weight of H3PO2? (mol. wt. is M)

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

In the reaction 2FeCl H S 2FeCl 2HCl S ->

In the reaction 3Br 6CO 3H O 5Br BrO 6HCO ->

In the reaction o 5 2 3Cl 6NaOH Na ClO 5Na Cl 3H O -> The element which loses as well as gains electrons is

The number of electrons lost in the following change is Fe H O Fe O H ->

Which of the following is the best description of the behaviour of bromine in the reaction given below? o H O Br HOBr H Br ->

In the reaction o o ½ K O KO ->

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

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

An oxidation process involves

In the reaction, SO 2H S 3S 2H O -> the substance oxidized is