Question

What is the reactive series? How does the reactive series of metal help in predicting the relative activities of various metal?

Answer 1

The metal reactivity series is a series or sequence of the order of the metals in decreasing order of theor reactivity.

Reactivity generally means that how hard the metal will react other elements it can react in different ways to gain a stable form.(i.e complete its octet or valency of 8e- )

This series helps us to know that which metal can displace which metal from its salt.

The most reactive metal can displace any metal from it salt.

Reactivity series in decreasing order;

• K
• Na
• Ca
• Mg
• Al
• Zn
• Fe
• Ni
• Sn
• Pb
• H
• Cu
• Hg
• Ag
• Au
• Pt

if the metal is at higher position than the other one it can displace it.

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Answer 2

Answer:

1 ) .Reactivity series :

It is series of decreasing order of metals' reactivity. Hydrogen is place in middle of series. Above hydrogen metals are more reactive in nature below are less. Metal which is more reactive it displaces a less reactive metal from its salt solution.

2 ) .

In order to obtaining a metal from its  oxides for metals in the middle of the reactivity series then metals towards oxides of such metals can be reduced with coke (carbon) which acts as a reducing agent.

For instance :

2 Fe₂O₃ + 3 C  ⇒ 4 Fe + 3 CO₂.

In order to obtaining a metal from its  oxides for metals in the high of the reactivity series their oxides are reduced to metals by the process of electrolysis

For instance :

Electrolysis of sodium chloride :

Na⁺ + e⁻  ⇒ Na   [ At cathode ]

2 Cl⁻ ⇒ Cl₂ + 2 e⁻   [ At anode ]