The red brown precipitate of aldehydes with Fehling solution is due to formation of `Cu_2O`/CuO.

When ethanal is heated with Fehling's solution, it gives a precipitate of :

A brown ring is formed in the ring test for NO_3^- ion. It is due to the formation of

When H_2O_2 is shaken with an acidified solution of K_2Cr_2O_7 in presence of ether, the ethereal layer turns blue due to the formation of

In qualitative analysis when H_2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO_3 , it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _______ .

A Compound with the empirical formula Co(NH_3)_5 BrSO_4 exists in two forms : red and violet. Solution of red gives a precipitate of AgBr on addition of AgNO_3 . The violet form Sives no precipitate on the addition at AgNO_3 but gives a white precipitate on addition of BaCl_2 solution. From these observations draw the structure of each compound and explain the observations.

A solution of (-)-1-chloro-1-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl_5 , due to the formation of

What type of reaction is combustion of coal and formation of water from H_2 and O_2 ?

Which of the following does not give brick red ppt. with fehling solution ?