In the following table some commonly used positive and negative radicals are listed. Use the criss-cross method to obtain the formulae of the compound that is formed using the given radicals. Name the compound, thus, obtained. Sl No. Positive radicals Negative radicals Formulae Name of the compounds 1 . Al 3 + CO 3 2 - 2 . K + SO 4 2 - 3 . NH 4 + SO 4 2 - 4 . Ni 2 + S 2 - 5 . Al 3 + C 4 - 6 . Ag 2 + Br - 7 . Ca 2 + F - 8 . Li + H - 9 . Al 3 + N 3 - 10 . Fe 3 + O 2 - 11 . Na + I - 12 . K + MnO 4 - 13 . H + ClO 3 - 14 . Ca 2 + HSO 4 - 15 . H + NO 2 - 16 . H + SO 3 2 - 17 . Ca 2 + P 3 - 18 . K + OH - 19 . H + NO 3 - 20 . H + SO 4 2 - 21 . H + S 2 - 22 . Cu + S 2 - 23 . Cu 2 + Cl - 24 . Hg 2 + Cl - 25 . Na + PO 3 3 - 26 . Ba 2 + PO 4 3 - 27 . Ca 2 + HCO 3 - 28 . NH 4 + OH - 29 . NH 4 + HPO 4 2 - 30 . K + H 2 PO 4 - 31 . H + Cl - 32 . H + ClO - 33 . H + ClO 4 - 34 . H + ClO 2 - 35 . K + CrO 4 2 - 36 . K + Cr 2 O 4 2 - 37 . Sn 4 + S 2 - 38 . Cr 3 + SO 4 2 - 39 . NH 4 + Cr 2 O 4 2 - 40 . Fe 3 + OH - 41 . Pb 4 + Cl - 42 . Mn 2 + O 2 - 43 . Ba 2 + CO 3 2 - 44 . Na + ZnO 2 2 - 45 . Pb 2 + NO 3 -

To write a chemical formula, we should know the symbols of elements or ions forming the compound and valency of each constituent element of the compound. When we write a chemical formula we write the valencies of the constituent elements or ions by interchanging as subscripts. This method is called the criss-cross method. The criss-cross method is a way to write the formulas of ionic compounds. The number associated with the charge of the first ion is assigned as the subscript of the second ion, signs of the charges are dropped. Sl No. Positive radicals Negative radicals Formulae Name of the compounds 1 . Al 3 + CO 3 2 - Al 2 CO 3 3 Aluminium carbonate 2 . K + SO 4 2 - K 2 SO 4 Potassium sulphate 3 . NH 4 + SO 4 2 - NH 4 2 SO 4 Ammonium sulphate 4 . Ni 2 + S 2 - NiS Nickel sulphide 5 . Al 3 + C 4 - Al 4 C 3 Aluminium carbide 6 . Ag 2 + Br - AgBr 2 Dibromosilver 7 . Ca 2 + F - CaF 2 Calcium difluoride 8 . Li + H - LiH Lithium hydride 9 . Al 3 + N 3 - AlN Aluminium nitride 10 . Fe 3 + O 2 - Fe 2 O 3 Iron III oxide or ferric oxide 11 . Na + I - NaI Sodium iodide 12 . K + MnO 4 - KMnO 4 Potassium permanganate 13 . H + ClO 3 - HClO 3 Chloric acid 14 . Ca 2 + HSO 4 - Ca HSO 4 2 Calcium hydrogen sulphate 15 . H + NO 2 - HNO 2 Nitrous acid 16 . H + SO 3 2 - H 2 SO 3 Sulphurous acid 17 . Ca 2 + P 3 - Ca 3 P 2 Calcium phosphide 18 . K + OH - KOH Potassium hydroxide 19 . H + NO 3 - HNO 3 Nitric acid 20 . H + SO 4 2 - H 2 SO 4 Sulphuric acid 21 . H + S 2 - H 2 S Hydrogen sulphide 22 . Cu + S 2 - Cu 2 S Copper( I ) sulphide 23 . Cu 2 + Cl - CuCl 2 Copper II chloride 24 . Hg 2 + Cl - HgCl 2 Mercuric chloride 25 . Na + PO 3 3 - Na 3 PO 3 Trisodium phosphite 26 . Ba 2 + PO 4 3 - Ba 3 PO 4 2 Barium phosphate 27 . Ca 2 + HCO 3 - Ca HCO 3 2 Calcium hydrogen carbonate or Calcium bicarbonate 28 . NH 4 + OH - NH 4 OH Ammonium hydroxide 29 . NH 4 + HPO 4 2 - NH 4 2 HPO 4 Diammonium hydrogen phosphate 30 . K + H 2 PO 4 - KH 2 PO 4 Potassium dihydrogen phosphate 31 . H + Cl - HCl Hydrogen chloride 32 . H + ClO - HClO Hypochlorous acid 33 . H + ClO 4 - HClO 4 Perchloric Acid 34 . H + ClO 2 - HClO 2 Chlorous acid 35 . K + CrO 4 2 - K 2 CrO 4 Potassium chromate 36 . K + Cr 2 O 4 2 - K 2 Cr 2 O 4 Potassium bichromate 37 . Sn 4 + S 2 - SnS 2 Tin sulphide 38 . Cr 3 + SO 4 2 - Cr 2 SO 4 3 Chromium sulphate 39 . NH 4 + Cr 2 O 4 2 - NH 4 2 Cr 2 O 4 Ammonium chromate 40 . Fe 3 + OH - Fe OH 3 Iron( III ) hydroxide or Ferric hydroxide 41 . Pb 4 + Cl - PbCl 4 Lead tetrachloride 42 . Mn 2 + O 2 - MnO 2 Manganese dioxide 43 . Ba 2 + CO 3 2 - BaCO 3 Barium carbonate 44 . Na + ZnO 2 2 - Na 2 ZnO 2 Sodium zincate 45 . Pb 2 + NO 3 - Pb NO 3 2 Lead( II ) nitrate

Balance the following chemical equation: As + HNO 3 → NO 2 + H 3 AsO 4 + H 2 O

A balanced chemical equation is a chemical equation where the number of atoms involved on the reactant's side is equal to the number of atoms on the product's side. The balanced chemical equation for the given reaction is: As + 5 HNO 3 → 5 NO 2 + H 3 AsO 4 + H 2 O A balanced chemical equation always follows the Law of Conservation of Mass.

Balance the following chemical equation: Cl 2 + SO 2 + H 2 O → H 2 SO 4 + HCl

A balanced chemical equation is a chemical equation where the number of atoms involved on the reactant's side is equal to the number of atoms on the product's side. The balanced chemical equation for the given reaction is: Cl 2 + SO 2 + 2 H 2 O → H 2 SO 4 + 2 HCl A balanced chemical equation always follows the Law of Conservation of Mass.

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The suffix for salts of `ous' oxyacids is .

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Important Questions on Language of Chemistry and Transformation of Substances

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Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 4

The compound

{SF}_{6}

is named as _____.

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Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 6

Stibnum is the Latin name of _____.

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Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 8

N_{2} + 3 H_{2} \to 2 {NH}_{3} + X kcal / mol

, then the formation of

{NH}_{3}

involves _____ (evolution/ absorption) of energy.

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Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 10

The symbol

S

stands for _____.

HARD

8th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 11

In the following table some commonly used positive and negative radicals are listed. Use the criss-cross method to obtain the formulae of the compound that is formed using the given radicals. Name the compound, thus, obtained.

Sl No.	Positive radicals	Negative radicals	Formulae	Name of the compounds
$1 .$	${Al}^{3 +}$	${CO}_{3}^{2 -}$
$2 .$	$K^{+}$	${SO}_{4}^{2 -}$
$3 .$	${NH}_{4}^{+}$	${SO}_{4}^{2 -}$
$4 .$	${Ni}^{2 +}$	$S^{2 -}$
$5 .$	${Al}^{3 +}$	$C^{4 -}$
$6 .$	${Ag}^{2 +}$	${Br}^{-}$
$7 .$	${Ca}^{2 +}$	$F^{-}$
$8 .$	${Li}^{+}$	$H^{-}$
$9 .$	${Al}^{3 +}$	$N^{3 -}$
$10 .$	${Fe}^{3 +}$	$O^{2 -}$
$11 .$	${Na}^{+}$	$I^{-}$
$12 .$	$K^{+}$	${MnO}_{4}^{-}$
$13 .$	$H^{+}$	${ClO}_{3}^{-}$
$14 .$	${Ca}^{2 +}$	${HSO}_{4}^{-}$
$15 .$	$H^{+}$	${NO}_{2}^{-}$
$16 .$	$H^{+}$	${SO}_{3}^{2 -}$
$17 .$	${Ca}^{2 +}$	$P^{3 -}$
$18 .$	$K^{+}$	${OH}^{-}$
$19 .$	$H^{+}$	${NO}_{3}^{-}$
$20 .$	$H^{+}$	${SO}_{4}^{2 -}$
$21 .$	$H^{+}$	$S^{2 -}$
$22 .$	${Cu}^{+}$	$S^{2 -}$
$23 .$	${Cu}^{2 +}$	${Cl}^{-}$
$24 .$	${Hg}^{2 +}$	${Cl}^{-}$
$25 .$	${Na}^{+}$	${PO}_{3}^{3 -}$
$26 .$	${Ba}^{2 +}$	${PO}_{4}^{3 -}$
$27 .$	${Ca}^{2 +}$	${HCO}_{3}^{-}$
$28 .$	${NH}_{4}^{+}$	${OH}^{-}$
$29 .$	${NH}_{4}^{+}$	${HPO}_{4}^{2 -}$
$30 .$	$K^{+}$	$H_{2} {PO}_{4}^{-}$
$31 .$	$H^{+}$	${Cl}^{-}$
$32 .$	$H^{+}$	${ClO}^{-}$
$33 .$	$H^{+}$	${ClO}_{4}^{-}$
$34 .$	$H^{+}$	${ClO}_{2}^{-}$
$35 .$	$K^{+}$	${CrO}_{4}^{2 -}$
$36 .$	$K^{+}$	${Cr}_{2} {O_{4}}^{2 -}$
$37 .$	${Sn}^{4 +}$	$S^{2 -}$
$38 .$	${Cr}^{3 +}$	${SO}_{4}^{2 -}$
$39 .$	${NH}_{4}^{+}$	${Cr}_{2} {O_{4}}^{2 -}$
$40 .$	${Fe}^{3 +}$	${OH}^{-}$
$41 .$	${Pb}^{4 +}$	${Cl}^{-}$
$42 .$	${Mn}^{2 +}$	$O^{2 -}$
$43 .$	${Ba}^{2 +}$	${CO}_{3}^{2 -}$
$44 .$	${Na}^{+}$	${ZnO}_{2}^{2 -}$
$45 .$	${Pb}^{2 +}$	${NO}_{3}^{-}$

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Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 12

Why is the burning of LPG a chemical change?

HARD

8th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 13

Balance the following chemical equation:

$As + {HNO}_{3} \to {NO}_{2} + H_{3} {AsO}_{4} + H_{2} O$

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8th CBSE

IMPORTANT

Pearson IIT Foundation Chemistry>Chapter 3 - Language of Chemistry and Transformation of Substances>PRACTICE QUESTIONS (CLASSROOM WING)>Q 13

Balance the following chemical equation:

${Cl}_{2} + {SO}_{2} + H_{2} O \to H_{2} {SO}_{4} + HCl$

The suffix for salts of `ous' oxyacids is .

Important Questions on Language of Chemistry and Transformation of Substances

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