In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal.

KCl (aq) + AgNO3 (aq) → AgCl (s) + KNO3 (aq) It is a double displacement and precipitation reaction.

Iron nails become reddish brown in colour and solution becomes green in colour.

(d) AgNO3 solution and copper metal

No change in mass will take place because mass can neither be created nor destroyed in a chemical reaction as law of conservation of mass states.

[Hint : Zinc reacts at faster rate as compared with copper, further zinc is cheaper than copper.]

[Hint :(a) The impurities are more soluble in the melt than in the solid state of the metal. (b) Impure metal is made to act as anode, while the strip of...

Copper is more reactive than silver. Hence, it displaces silver from the silver nitrate solution according to the given reaction. Cu(s) +   2AgNO3(aq) --------> Cu(NO3)2(aq)   +    2Ag(s) Copper       Silver nitrate ...

(i) When silver nitrate solution is added to sodium chloride solution, a white precipitate of silver chloride is formed along with sodium nitrate solution. AgNO3(aq)+ NaCl(aq) --------> AgCl(s) + NaNO3(aq)      ...

Copper is more reactive than silver. Hence, it displaces silver from the silver nitrate solution according to the given reaction.  Cu(s) +   2AgNO3(aq) --------> Cu(NO3)2(aq)   +    2Ag(s)  Copper       Silver nitrate ...

(a) 2Cu(NO3)2 → 2CuO+ 4NO2+O2 (b) The brown gas 'X' has to be nitrogen dioxide. (c) This type of reaction falls under the category of Decomposition reactions. (d) The pH of the aqueous...