Chemistry Question Bank

Silver nitrate solution is kept in brown bottles in laboratory because :

KMnO4 is manufactured on a large scale by (a)fusing MnO2 with KOH and then oxidizing the fused mixture with KNO3

Mercury is the only metal that is liquid at 0ºC. This is due to its :

Chemically philosopher of wool is :

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 ->

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

Which of the following oxides of manganese is amphoteric ?

is prepared by treating a solution containing Mn2+ ions with a very strong oxidizing agent such as

KMnO4 in an acidic medium will not oxidize (a) (b)

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 of the following is an incorrect statement ? (a)In a redox reaction in acidic medium, KMnO4 produces Mn2+ ions. (b)In a redox reaction in strongly alkaline medium, KMnO4produces MnO ions. (c)In a redox reaction …

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

KMnO4 in an acidic medium oxidizes (a) C O to CO2 (b) N2H4 to N2 (c) HSO to SO

Which of the following compounds is colourless?

Which of the following compounds is expected to be coloured ?

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

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

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

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

The noble character of platinum and gold is favoured by

For a given ion, the magnetic moment is 2.83 BM. The total spin (s) of all the unpaired electrons is

The covalent radii of transition metals decrease from left to right in a period because