Exercise

Complete the following reaction and give names of the products.

${\mathrm{CuSO}}_4{ }_{\left(\mathrm{aq}\right)} + {\mathrm{Fe}}_{ \left(\mathrm{s}\right) } \to \mathrm{\_\_\_\_\_} +\hspace{0.17em}\mathrm{\_\_\_\_\_}$.

Some more examples of redox reaction are as follows. Identify the reductants and oxidants from them.

$2{\mathrm{H}}_2\mathrm{S} + {\mathrm{SO}}_2 \to 3\mathrm{S}\downarrow + 2{\mathrm{H}}_2\mathrm{O}$

${\mathrm{MnO}}_2 + 4 \mathrm{HCl} \to {\mathrm{MnCl}}_2 + 2{\mathrm{H}}_2\mathrm{O} + {\mathrm{Cl}}_{2 }\uparrow$

Identify the given reaction as endothermic or exothermic reaction.

$2{\mathrm{KClO}}_3\left(\mathrm{s}\right) \stackrel{ }{\stackrel{∆}{\to }} 2\mathrm{KCl}\left(\mathrm{s}\right) + 3{\mathrm{O}}_2\uparrow$

Define the following term:

Oxidising agent

A, B and C are three elements which undergo chemical reaction according to the following equations.

${\mathrm{A}}_2{\mathrm{O}}_3 + 2\mathrm{B}\to {\mathrm{B}}_2{\mathrm{O}}_3 + 2\mathrm{A}$

$3{\mathrm{CSO}}_4 + 2\mathrm{B}\to {\mathrm{B}}_2({\mathrm{SO}}_4{)}_3+ 3\mathrm{C}$

$3\mathrm{CO} + 2\mathrm{A}\to {\mathrm{A}}_2{\mathrm{O}}_3+3\mathrm{C}$

Answer the following questions with reason.

(i) Which element is the most reactive?
(ii) Which element is the least reactive?
(iii) What is the type of reaction listed above?

(i) What will you observe when you put

(a) some zinc pieces into blue copper sulphate solution.
(b) Some copper pieces into green ferrous sulphate solution.

(ii) Write the balanced chemical equation also.

With the help of an experiment show that water is made up of two gases. 

Which one of the following set-ups is the most appropriate for the evolution of hydrogen gas and its identification?