Potassium dichromate is an orange coloured crystal and is an important compound used as an oxidant in many reactions How do you prepare `K_2Cr_2O_7` from chromite ore?

Potassium dichromate is an orange colour crystal and is an important compound used as an oxidant in many reactions How will you account for the colour of potassium dichromate crystals?

Fourteen elements following Lanthanum are called Lanthanoids. KMnO_2 is a purple coloured crystal and it acts as an oxidant. How will you prepare from MnO_2 ?

Which is not related to the reactions of K_(2)Cr_(2)O_(7) ?

How do you account for the following observations? a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. b) When concentrated- sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas 'HCl', but if the mixture contains bromide, then we get red vapours of bromine. Why?

A list of compounds are given below: (H_2O, HCI, CH_4) Construct chemical reactions to show the preparation of H_2 , from each of the above compounds.

Find out the oxidation number of 'Cr' in the following compounds ?(Hint : oxidation number k = + 1 , 0 = -2 ) K_2Cr_2O_7

Chimical reactions which involve oxidation and reduction are called redox reactions. The unbalanced equation in the ionic form of a redox reaction is shown below Fe^(2+) (aq) +Cr_2O_7^(2-) (aq) overset(acidic medium) (rarr)Fe^(3+) (aq) +Cr^(3+) (aq) a) Identify the oxidizing agent in this reaction

Chimical reactions which involve oxidation and reduction are called redox reactions. The unbalanced equation in the ionic form of a redox reaction is shown below Fe^(2+) (aq) +Cr_2O_7^(2-) (aq) overset(acidic medium) (rarr)Fe^(3+) (aq) +Cr^(3+) (aq) b) Name the species getting oxidized in the above reaction.

Chimical reactions which involve oxidation and reduction are called redox reactions. The unbalanced equation in the ionic form of a redox reaction is shown below Fe^(2+) (aq) +Cr_2O_7^(2-) (aq) overset(acidic medium) (rarr)Fe^(3+) (aq) +Cr^(3+) (aq) c) Balance the above equation by the oxidation number method.