Why oxidation of toluene with `CrO_3` to benzaldehyde is carried out in the presence of acetic anhydride.

A hydrogenation reaction is carried out at 500 K . If the same reaction is carried out in the presence of a catalyst at the same rate, the temperature required is 400 K . Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20 kJ mol^(-1) . a) 100 kJ/mol b) 80 kJ/mol c) 60 kJ/mol d) none of these

The reaction of toluene with Cl_2 in the presence of FeCl_3 gives predominantly

True or False Fermentation tank where fermentation is carried out in the presence of micro-organisms is called bioreactor.

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. To which group of periodic table does this non-metal belong?

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.

Amount of oxalic acid present in a solution can be determined by its titration with KMnO_4 solution in the presence of H_2SO_4 . The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

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.