A mixed oxide of iron and chromium, `FeO.Cr_2O_3` is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify the compounds (A) and (B) .

A mixed oxide of iron and chromium, FeO.Cr_2O_3 is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify write balanced chemical equations for each step.

The compound AgF_(2) is unstable compound However, if formed, the compound acts as a very strong oxidising agent. Why ?

A non-metal A which is the largest consituent of air, when heated with H_2 in 1:3 ratio in the presence of catalyst gives a gas B. on heating with O_2 it gives an oxide C. If this oxide is passed into water in the presence of air it gives an acid D which acts as a strong oxidising agent. Identify A,B,C and D.

The metal which does not form colour compound is: Chromium, Iron, Zinc, Manganese.

An element A reacts with water to form a compound B which is used in white washing. The compound B on heating forms an oxide C which on treatment with watr gives back B. identify A, B and C and give the reacitons involved.

Write the oxidation number of central atom in the following compound : K_3[Cr (C_2O_4)_3 ]

Generally transition elements form coloured salts due to the presence of unpaired electrons, Which of the following compounds will be coloured in solid state ?

The mixture of compounds A and B is passed through a column of Al_2O_3 by using alcohol as eluant . Compound A is eluted in preference to compound B. Which of the compounds A or B, is more readily adsorbed on the column?

Write the oxidation number of central atom in the following compound : [Cr Cl_2 (H_2O)_4 ]NO_3

Write the oxidation number of central atom in the following compound : [Cr (NH_3)_3 (H_2O)_3 ]Cl_3