Chapter 3, Problem 52QRT

(a)

Interpretation Introduction

Interpretation:

The given reaction below is acid- base reaction, oxidation – reduction reaction or precipitation reaction has to be identified.

  ${\text{CdCl}}_{\text{2}}\text{(aq) +}{\text{Na}}_{\text{2}}\text{S(aq)}\to \text{ CdS(s)}\text{+}\text{2NaCl(aq)}$

Concept Introduction:

Precipitation reaction: The formation of the product is insoluble when the ions combine in the solution is called precipitation reaction.

Acid - base reaction: Formation of the salt from the cation from the base and anion from the acid and formation of water is also the product.

Gas forming reaction: The reaction of acid and metal carbonates which produce carbonic acid. The carbonic acid decomposes which gives water and carbon dioxide.

Oxidation - reduction reaction: The electrons are transferred to one to other is called oxidation reduction reaction.

(b)

Interpretation Introduction

Interpretation:

The given reaction below is acid- base reaction, oxidation – reduction reaction or precipitation reaction has to be identified.

  $\text{2Ca(s) +}{\text{O}}_{\text{2}}\text{(g)}\to \text{ 2CaO(s)}$

Concept introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The given reaction below is acid- base reaction, oxidation – reduction reaction or precipitation reaction has to be identified.

    ${\text{Ca(OH)}}_{\text{2}}\text{(s) +}\text{2HCl(aq)}\to {\text{ CaCl}}_{\text{2}}\text{(aq)}+{\text{2H}}_{\text{2}}\text{O(l)}$

Concept introduction:

Refer to part (a).