Chemistry Question Bank

HgCl reacts with mercury in an iron vessel to form mercurous chloride. HgCl + Hg Hg Cl Δ -> 2. Mercurous chloride can also be prepared by the reduction of mercury chloride by tin. 2+ 2HgCl + SnCl Hg Cl SnCl ->

Sodium thiosulphate, Na2S2O3. 5H2O is used in photography to :

Which of the following oxides of manganese is stable as well as strongly acidic ?

Which of the following oxides of manganese is amphoteric ?

Spiegeleisen is an alloy of :

Deep red-yellow vapour of CrO2Cl2 is passed into an aqueous solution of NaOH. The solution turns

Which of the following statements is incorrect for CrO3 ? (a)It is a bright orange solid.

The value of magnetic moment ( spin only) for Cu2+ in CuSO4.5H2O is

Which one of the following oxides of chromium is amphoteric in nature ?

The compound ZnSO4 is white because (a)charge is transferred from the metal to the oxygen atoms (b)electron transfer to d level does not occur as the level is already filled to capacity in zinc

Which of the following compounds is colourless?

Which of the following compounds is expected to be coloured ?

Philosopher’s wool when heated with BaO at 1100ºC gives the compound :

Identify the species having an atom in +6 oxidation state. (a) (b) [Cr(CN) ] (c)

Give the correct order of initials T or F for the following statements. Use T if the statement is true and F if it is false. (I) Sulphide ions reacts with Na2 [Fe(CN)5(NO)] to form a purple-coloured compound Na4 [Fe(C…

The incorrect statement among the following is: (NEET 2021)

Heat 4K Cr O 4K CrO 3O X -> . In the above reaction X is

Chromyl chloride, CrO2Cl2, is prepared by heating a mixture of

Sodium chromate is prepared by (a)fusing chromite (FeCr2O4) with sodium chloride in air (b)fusing chromite (FeCr2O4) with sodium hydroxide in air (c)fusing (NH4)2Cr2O7 with sodium hydrogen sulphate in nitrogen

reacts with OH– as CrO 2CrO 2H Cr O H O -> Cr O The change in oxidation number of Cr is

CrO3 dissolves in aqueous NaOH to give (a) CrO

Na2CrO4 on treatment with lead acetate gives a precipitate. This precipitate is dried and the solid is used as a pigment for road signs and markings. The solid is known as

Acidified K2Cr2O7 on treatment with KI produces

When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is

reacts with H+ as The change in oxidation number of Cr is