Q63 of 152 Page 49

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?

(a) Metal x is Silver(Ag).

(b) Salt XNO3 is Silver Nitrate(AgNO3)


(c) Compound Y is Silver Chloride (AgCl).


(d) the chemical equation:


AgNO3 (aq.) + NaCl (aq.) AgCl (s) + NaNO3 (aq.)


(e) Double Displacement Reaction takes place.



More from this chapter

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61 A strip of metal X is dipped in a blue coloured salt solution YSO4. After some time, a layer of metal Y form the salt solution is formed on the surface of metal strip X. Metal X is used in galvanization whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.

(a) What could metal X be?


(b) What could metal Y be?


(c) Name the metal salt YSO4.


(d) What type of chemical reaction takes place when metal X reacts with salt solution YSO4? Write the equation of the chemical reaction involved.


(e) Name the alloy Z.

 62 When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue.

(a) What do you think is metal X?


(b) What could be gas Y2?


(c) What is compound XO?


(d) What is compound Y2O?


(e) Write the chemical equation of the reaction which takes place on heating XO with Y2.


(f) What type of chemical equation of the reaction which takes place on heating XO with Y2.

 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.

 65 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?