`BaSO_4` is used in the investigatyion of digestive problems as 'barium meals' becausse barium ions can be detected by X-rays. Write the equilibrium equations for what happens when `BaSO_4` is added to water and write the expression for the `K_(sp)` for `BaSO_4`.

When a white crystalline compound 'X' is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) a red dish brown gas 'A' is evolved. On passing 'A' into caustic soda solution, a yellow coloured solution of 'B' is obtained. Neutralising 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 a colourless gas is evolved and on passing this a gas into K_(2)HgI_(4) (Nessler's reagent) solution a reddish brown precipitate D is formed. Identify '(A), (B), (C), (D) and X. Write equations for the reactions involved.

To 10 mL of 1m BaCl_(2) solution 5mL of 0.5 M K_(2)SO_(4) is added BaSO_(4) is precipitated out. What will haapen?

Dihydrogen gas is obtained from natural gas by partial oxidation with steam as per following endothermic reaction: 'C H_4(g)+H_2 O_(g) hArr C O_(g)+3 H_2(g)' a) Write an expression'for 'K_p' for the above reaction. b) How will the values of 'K_p' and composition of equilibrium mixture be affected by i) increasing the pressure ii) increasing the temperature iii) using a catalyst.