Give reason for the following:
(i). Silver ornament gets tarnished when exposed to atmosphere for a long time.
(ii) Silver nitrate solution is kept in dark coloured bottles.
(iii). Why does `AgNO_3` produce a black stain on the skin.

Give reason for the following: Silver nitrate solution is kept in coloured bottles.

Give scientific reasons for the following: Copper vessels turn greenish and silver articles turn blackish when kept open in air for a long time.

Give reason for the following observations : (i) When Silver nitrate solution is added to Potassium iodide soltuion , a negatively charge colloidal solution is formed. (ii) Finely divided substance is more effective as an adsorbent. (iii) Lyophilic colloid are also called reversible sols.

Give reason for the following observations : (i) When Silver nitrate solution is added to Potassium iodide soltuion , a negatively charge colloidal solution is formed. (ii) Finely divided substance is more effective as an adsorbent. (iii) Lyophilic colloid are also called reversible sols.

Give reasons for the following : (i) The blue colour of copper sulphate solution is rendered light green when a piece of iron is dropped into it. (ii) Fried potato chips are often packed with nitrogen gas. (iii) Cooked food emits a bad smell when left exposed to air for a day or two.

Give reasons for the following : (i) Carbonate and sulphide ores are converted into oxides before reduction. (ii) Aluminium is rendered passive when it is dipped in conc. HNO_(3) (iii) Nonmetals do not displace hydrogen from acids. (iv) An aqueous solution of CuSO_(4) cannot be stored in an iron vessel. (v) The surface of some metals become dull when left exposed to air for a long time.

Give reasons for the following : (i) Zinc can displace copper from copper sulphate solution. (ii) Silver articles become black after sometime when exposed to air. (iii) A metal sulphide is converted to its oxide to extract the metal from sulphide ore.

Explain the following: When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time, Why does this happen? Write the chemical equation.