A metal 'X' on treatment with NaOH forms a white precipitate (A) which is soluble in excess of NaOH to yield complex (B). (A) is soluble in HCI to produce (C). On strong heating (A) gives (D) from which the metal is extracted. Identity X, A, B, C, D and write the equation involved.

When metal X is treated with sodium hydroxide, a white precipitate A is obtained, which is soluble in excess of NaOH to give soluble complex B. Compound A is soluble in dilute HCl to form compound C. The compound A when heated strongly gives, D which is used to extract metal . Identify X, A, B, C and D. Write suitable equations to support their identities.

When metal 'M' is treated with NaOH , a white gelatinous precipitate 'X' is obtained , which is soluble in excess of NaOH . Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent . The metal 'M' is -

Questions carrying 2 marks : Addition of NaOH solution to a solution of Zn Cl_2 produces a white precipitate which dissolves in excess of NaOH and forms soluble sodium zincate. Why?

An organic compound (A) with molecular formula C_(6)H_(7)N gives (B) with HNO_(2)//HCl at 273 K. The aqueous solution of (B) on heating gives compound (C) which gives violet colour with neutral FeCl3. Identify the compounds A, B and C and write the equations.

An organic compound 'A' (C_2H_6O) reacts with sodium to form a compound 'B' with the evolution of hydrogen gas and gives a yellow compound 'C' when treated with iodine and NaOH. When heated with conc. H_2SO_4 at 140^@C it gives a compound 'D' C_4H_(10) which on treatment with HI at 100^@C gives 'E'. 'B' when heated with 'E' also gives back 'D'. Identify 'A' to 'E' and write equations for the reaction involved.

An organic compound A (C_3H_5N) when heated with concentrated NaOH, NH_3 gas evolved with formation of a sodium salt of carborylic acid (B). On reduction A give C(C_3H_9N)C when treated with Nitrous acid gives D. Find A,B,C,D and writes the relevant reactiosn involved.

A compound (A) (C_7H_4N) on hydrolysis with strong aqueous acid gives another compound (B) on treatment with ammonia gives a salt which on heating gives (C). The compound (C) undergoes Hofmann's bromamide reaction to yield aniline. Identify A, B, C and write chemcial reactions involved.