Chapter 19, Problem 19.78SP

(a)

Interpretation Introduction

Interpretation:

The reaction of nitric oxide turns brown when exposed to air and its balanced equation has to be written.

Concept introduction:

Balanced Chemical equation:

A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.

(b)

Interpretation Introduction

Interpretation:

The reaction of nitric acid turns yellow-brown on standing and its balanced equation has to be written.

Concept introduction:

Balanced Chemical equation:

A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.

(c)

Interpretation Introduction

Interpretation:

Silver dissolves in dilute ${\text{HNO}}_{\text{3}}$, yielding a colourless gas.  The balanced equation for this reaction has to be written.

Concept introduction:

Balanced Chemical equation:

A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.

(d)

Interpretation Introduction

Interpretation:

The reaction of hydrazine reduces iodine to ${\text{I}}^{\text{-}}$ and in the process is oxidized to ${\text{N}}_{\text{2}}$ gas its balanced equation has to be written.

Concept introduction:

Balanced Chemical equation:

A balanced chemical equation is an equation which contains same elements in same number on both the sides (reactant and product side) of the chemical equation thereby obeying the law of conservation of mass.