Give the meaning of the following:
$H_{2} {SO}_{4}$

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Solution

Chemical formula:
The symbolic representation of a molecule of a compound is called its chemical formula.
To write the formula of a chemical substance, the valency and the symbol of the various atoms or radicals present in it must be known.
For example:
The chemical formula of sulphuric acid is $H_{2} {SO}_{4}$ .
So, $H_{2} {SO}_{4}$ is the chemical formula of sulphuric acid.

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Fill in the missing data in the following table

	Salts obtained from
	Name of salt	Formula	Base	Acid
1.	Ammonium Chloride	${NH}_{4} Cl$	${NH}_{4} OH$	(i)_____
2.	Copper Sulphate	(ii)______	(iii)______	$H_{2} {SO}_{4}$
3.	Sodium Chloride	$NaCl$	$NaOH$	(iv)_____
4.	Magnesium Nitrate	$Mg {({NO}_{3})}_{2}$	(v)______	${HNO}_{3}$
5.	Potassium Sulphate	$K_{2} {SO}_{4}$	(vi)_______	(vii)______
6.	Calcium Nitrate	$Ca {({NO}_{3})}_{2}$	$Ca {(OH)}_{2}$	(viii)_______

Write the chemical names of the following compounds:

$K_{2} {SO}_{4}$

${Mg}_{3} {({PO}_{4})}_{2}$

${NH}_{4} Cl$

$ZnS$

${Na}_{3_{}} N$

$AgBr$

Complete the table given below for writing the formula of a chemical compound.

Identify the valency

Criss cross the valency

Formula of the compound

Name of the compound

$Cr$	${SO}_{4}$

$Cr$	${SO}_{4}$

Complete and balance the following equations

(ⅰ ) $N_{2}$ + $H_{2}$ $\to$ $. . . . .$

(ⅱ) ${NH}_{3}$ + ${Cl}_{2} E x c e s s$ $\to$ $. . . . .$

(ⅱⅰ) $PbO$ + ${NH}_{3}$ $\to$ $. . . . . + . . . . + H_{2} O$

(ⅳ) ${NH}_{3}$ + $O_{2}$ $\overset{pt}{\to} 800 ° C$ $. . . . . + . . . . . .$

27. A non-metallic element is converted into a compound X after a series of reactions. A little amount of X when tested with blue litmus turns to red. X on complete reaction with another compound Y gave the product which did not respond to litmus test. Identify the correct sequence of the reactions.

(1) $2 {SO}_{2} + O_{2} \to 2 {SO}_{3}$

(2) $H_{2} {SO}_{4} + 2 KOH \to K_{2} {SO}_{4} + 2 H_{2} O$

$(3) {SO}_{3} + H_{2} O \to H_{2} {SO}_{4}$

$(4) S + O_{2} \to {SO}_{2}$

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Give the meaning of the following:H2SO4

Give the meaning of the following:
$H_{2} {SO}_{4}$