Zinc is used but not copper for the recovery for metallic silver from the complex [Ag(CN)2]-,

Answer 2AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2Ag (s) Silver Nitrate + Copper → Copper Nitrate + Silver

(c) Food cans are coated with tin and not with zinc because zinc is more reactive than tin.

Atomic mass of silver (Ag) = 108 u  Since mass of 6.022 × 1023 atoms of silver (Ag) = 108 u  Hence mass of 3.011 × 1023 atoms of silver (Ag)  = 108×3.011×1023/...

Mass of silver = m g  Mass of gold = m /100g  Number of atoms of silver =  Mass/ Atomic mass X NA                        ...

Zinc is above hydrogen rvhereas copper is below hydrogen in the activity series of metals. That is why zinc displaces hydrogen from dilute hydrochloric acid, while copper does not.    ...

Copper is a much better conductor of heat than steel. Also, copper does not react with water at all but steel (an alloy of iron) reacts with steam. So, copper is used to...

(C) Formation of compost from vegetable matter. Reactions given in option (A), (B) and (D) are examples of endothermic reactions and require energy in form of heat, light and electricity respectively....

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid because zinc is more reactive than hydrogen. However, copper does not liberate hydrogen gas when reacted with dilute hydrochloric acid...

(b) : In acidic solution, NH3 forms a bond with H+ to give NH4+ ion which does not have a lone pair on N atom. Hence it cannot act as...

Metallic solid conducts electricity in solid state but ionic solid conducts electricity only in solution or in molten state.