The catalytic activity of transition elements is related to their-
1 Crore+ students have signed up on EduRev. Have you? Download the App |
When KMnO4 solution is added to hot oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time. This is because-
The higher oxidation states of transition elements are found to be in the combination A and B, which are -
In the equation M + 8CN- + 2H2O + O2 → 4[M(CN)2]- + 4OH-, metal M is-
An element of 3d-transition series shows two oxidation states x and y, differ by two units then
1 mole of Fe2+ ions are oxidised to Fe3+ ions with the help of (in acidic medium)
The metals present in insulin and haemoglobin are respectively-
To an acidified dichromate solution, a pinch of Na2O2 is added and shaken. What is observed.
The rusting of iron is formulated as Fe2O3. xH2O which involves the formation of -
A metal M which is not affected by strong acids like conc. HNO3, conc. H2SO4 and conc. solution of alkalies like NaOH, KOH forms MCl3 which finds use for toning in photography. The metal M is-
Solid CuSO4. 5H2O having covalent, ionic as well as co-ordinate bonds.Copper atom/ion forms.......co-ordinate bonds with water.
Amongst the following species, maximum covalent character is exhibited by-
Number of moles of SnCl2 required for the reduction of 1 mole of K2Cr2O7 into Cr2O3 is (in acidic medium)
The aqueous solution of CuCrO4 is green because it contains-