Q65 of 152 Page 49

A red-brown metal X forms a salt XSO4. When hydrogen sulphide gas is passed through an aqueous solution of XSO4, then a black precipitate of XS is formed along with sulphuric acid solution.

(a) What could the salt xso4 be?


(b) What is the colour of salt XSO4?


(c) Name the black precipitate XS.


(d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.


(e)What type of chemical reaction takes place in this case?

(a) Salt XSO4 is Copper Sulphate.

(b) Colour of salt is “Blue”.


(c) Copper sulphidde is the black precipitate


(d) The chemical equation:


CuSO4 (aq.) + H2S (g) CuS (s) + H2SO4 (aq.)


(e) Double displacement reaction takes place.



More from this chapter

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63 A metal X forms a water soluble salt XNO3. When an aqueous solution of XNO3 is added to common salt solution, then a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrochloric acid.

(a) What is metal X?


(b) What is salt XNO3?


(c) Name the compound Y.


(d) Write the chemical equation of the reaction which takes place on reacting XN03 solution and common salt solution giving the physical states of all the reactants and products.


(e) What type of chemical reaction is illustrated by the above equation?

 64 Two metals X and Y form the salts XSO4 and Y2SO4, respectively. The solution of salt XSO4 is blue in colour whereas that of Y2SO4, is colourless. When barium chloride solution is added to XSO4 solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to Y2SO4, solution, then the same white precipitate Z is formed along with colourless common salt solution.

(a) What could the metals X and Y be?


(b) Write the name and formula of salt XS04.


(c) Write the name and formula of salt Y2S04


(d) What is the name and formula of white precipitate Z?


(e) Write the name and formula of the salt which turns the solution green in the first case.

 66 When a strip of red-brown metal X is placed in a colourless salt solution YNO3 then metal Y is set free and a blue coloured salt solution XNO3H is formed. The liberated metal Y forms a shining white deposit on the strip of metal X.

(a) What do you think metal X is?


(b) Name the salt YNO3.


(c) What could be metal Y?


(d) Name the salt X(NO3)2.


(e) What type of reaction takes place between metal X and salt solution YNO3?

 67 A metal salt MX when exposed to light splits up to form metal M and a gas X2. Metal M is used in making ornaments whereas gas X2 is used in making bleaching powder. The salt MX is itself used in black and white photography.

(a) What do you think metal M is?


(b) What could be gas X2?


(c) Name the metal salt MX.


(d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX.


(e) What type of chemical reaction takes place when salt MX is exposed to light? Write the equation of the reaction.