Chemistry in Everyday Life

A. $\underset{Salt}{N{a}_{2}C{O}_3}+\underset{di\mathcal{l}}{H_{2}S{O}_4}\to NaS{O}_4+H_{2}O+C{O}_2\uparrow$            

CO₂ is colourless gas with brisk effervescence and turns lime water milky

$C{O}_2+Ca{\left(OH\right)}_2\to CaC{O}_3\downarrow +H_{2}O$                              

B. $\underset{Salt}{N{a}_{2}S}+\underset{di\mathcal{l}}{H_{2}S{O}_4}\to N{a}_{2}S{O}_4+H_{2}S\uparrow$            

H₂S + (CH₃COO)₂Pb → $\underset{Black}{PbS}+2C{H}_{3}COOH$  

C. $\underset{Salt}{N{a}_{2}S{O}_3}+\underset{di\mathcal{l}}{H_{2}S{O}_4}\to N{a}_{2}S{O}_4+H_{2}O+S{O}_3\uparrow$            

SO₃ is colourless gas which turns acidified potassium dichromate solution green as

$S{O}_3+KMn{O}_4+H^{+}\to \underset{Green}{MnS{O}_4}+S{O}_4^{2-}+H_{2}O$                             

D. $\underset{Salt}{2NaN{O}_2}+\underset{di\mathcal{l}}{H_{2}S{O}_4}\to N{a}_{2}S{O}_4+2HN{O}_2$          

$3HN{O}_2\to NH{O}_3+2NO+H_{2}O$                              

$2NO+O_2\to \underset{Browngas}{2N{O}_2}$                              

$2HN{O}_2+2Kl+2C{H}_{3}COOH\to 2C{H}_{3}COOK+2H_{2}O+2NO+I_2$                             

I₂ + starch → Blue colour complex.

This is a multiple choice answer as classified in NCERT Exemplar

(a, c, d)

(a) Cationic detergents are quaternary ammonium salts of amines with acetates, chlorides or bromides as anions. These detergents have germicidal properties.

(b) Bacteria cannot degrade the detergents containing highly branched chains, therefore, in most of the detergents used these days, the branching is kept to a minimum so that the detergents become easily biodegradable.

(c) Some synthetic detergents can give foam even in ice cold water.

(d) Synthetic detergents are cleansing agents which have all the properties of soaps, but which actually do not contain any soap.