When a black metal compound XO is heated with a colourless gas $Y_{2}$ , then metal X and another compound $Y_{2} O$ are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas $Y_{2}$ can be prepared by the action of a dilute acid on any active metal. The compound $Y_{2} O$ 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 $Y_{2}$ ?

(c) What is compound XO ?

(d) What is compound $Y_{2} O$

(e) Write the chemical equation of the reaction which takes place on heating XO with $Y_{2}$ .

(f) What type of chemical reaction is illustrated in the above equation ?

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Solution

(a) Copper (Cu)
(b) Hydrogen ( $H_{2}$ )
(c) Copper oxide (CuO)
(d) Water ( $H_{2} O$ )
(e)
(f) Displacement reaction (which is also a redox reaction).

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A metal X forms a water soluble salt $X N O_{3}$ . When an aqueous solution of $X N O_{3}$ is added to common salt solution, then a white precipitate fo 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 hydrohloric acid.

(a) What is metal X ?

(b) What is salt $X N O_{3}$ ?

(d) Write the chemical equation of the reaction which takes place on reacting $X N O_{3}$ solution an 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 ?

Q. When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.

Q. 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 alongwith sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrohloric acid.
(a) What is metal X?
(b) What is salt XNO₃?
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(d) Write the chemical equation of the reaction which takes place on reacting XNO₃ 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?

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(a) Copper (Cu) (b) Hydrogen ( H2) (c) Copper oxide (CuO) (d) Water ( H2O) (e) (f) Displacement reaction (which is also a redox reaction).

(a) Copper (Cu)
(b) Hydrogen ( $H_{2}$ )
(c) Copper oxide (CuO)
(d) Water ( $H_{2} O$ )
(e)
(f) Displacement reaction (which is also a redox reaction).