A metal A in the form of turnings reacted with a hot concentrated dibasic acid `H_2 B` and produced a deep blue solution of salt AB. When a wire of metal C is put in the solution of AB, the deep blue colour gels slowly discharged leaving behind a colourless CB salt solution and A was generated. Identify A, `H_2 B`, AB, C and CB, and also explain the observations.

A solution of a salt in concentrated sulphuric acid H_(2)SO_(4) acid produced a deep blue colour with starch iodide solution.The salt may be

Solution of a salt in dil H_(2)SO_(4) produces deep blue colour with starch iodide solution .The salt contains

A metal 'X' used to make calorimeters reacts with concentrated nitric acid to form a soluble salt Y. When few drops of ammonium hydroxide are added pale blue precipitates 'Z' are obtained. These precipitates dissolve in excess of ammonium hydroxide to form deep blue solution 'A'. Identify the metal X and give all the chemical equations.

A liquid 'A' is treated with Na_(2)CO_(3) solution. A mixture of two salts 'B' and 'C' is produced in the solution. The mixture on acidification with sulphuric acid and distillation produces the liqiud 'A" again. Identify 'A','B' and 'C' and write the equations involved.

When a white crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow coloured solution of B is obtained. Neutralizing the solution B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with NaOH solution, a colourless gas is evolved and on passing this gas into K_2HgI_4 solution, a reddish brown precipitate D is formed. Identify A, B, C, D and X. Write the equations of reactions involved.

When a white crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) a reddish brown gas A is evolved On passing A into saustic soda solution ,a yellow coloured solution of B with acetic B is obtained .Neutradiding the solution of B with acetic acid and on obtaijned when X of lead acetate with NaOH solution precipitate C is obtained when X is heated with NaOH solution a coloueless gas is evolved and on passing the gas into K_(2)HgI_(4) solution a reddish brown precipitate D is formed identify A,B,C and D and X write the equation of the reaction involved.

Urea reacts with water to form A which will decompose to form B. B when passed through Cu^(2+) (aq), deep blue color solution C is formed. What is the formula of C from the following?

A gas 'A' reacts with another gas 'B' in the presence of a catalyst to give a colourless gas 'C'. the gas 'C' when comes in contact with air produces a brown gas 'D'. The solution of 'A' in water turns red litmus blue. Explain the observations.

Identify D When a white crystalline compound X is heated with K_2Cr_2O_7 and concentrated H_2SO_4 , a reddish brown gas A is evolved. On passing A into caustic soda solution a yellow coloured solution of B is obtained Neutralising the solution of B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained. When X is heated with NaOH solution a colourless gas is evolved and on passing this gas into K_2Hgl_4 solution a reddish brown precipitate D is formed.

When a white crystalline compound X is heated with K_2Cr_2O_7 and concentrated H_2SO_4 a reddish-brown gas A is evolved. On passing A into caustic soda solution, a yellow-coloured solution B is obtained neutralising the of lead acetate, a yellow precipitate C is obtained. When X is heated with NaOH solution a colourless gas is evolved and on passing this gas into K_2HgI_4 solution a reddish-brown precipitate D is formed. Identify A,B,C,D, and X. Write the equations of the reactions involved.