Selina solutions for Concise Chemistry [English] Class 9 ICSE chapter 1 - The Language of Chemistry [Latest edition]

What is a symbol? What information does it convey?

Why is the symbol S for sulphur, but Na for sodium and Si for silicon?

Write the full form of IUPAC. Name the elements represented by the following symbols:

Au, Pb, Sn, Hg

What do the following symbol stand for?

H

What do the following symbol stand for?

H₂ 

What do the following symbol stand for?

2H

What do the following symbol stand for?

2H₂ 

What is meant by atomicity? Name the diatomic element.

Give the formula and valency of:

Give the formula and valency of:
chromate ………….…….. .

Give the formula and valency of:
aluminium ………………. .

Give the formula and valency of:
cupric  ………………… . 

What is a chemical formula? What is the significance of a formula?give an example to illustrate?​

What do you understand by the following terms?

Acid radical 

What do you understand by the following terms?

Basic radical

Select the basic and acidic radicals in the following compounds.
MgSO₄ 

Select the basic and acidic radicals in the following compounds.
(NH₄)₂SO₄

Select the basic and acidic radicals in the following compounds.
Al₂(SO₄)₃

Select the basic and acidic radicals in the following compounds.
ZnCO₃

Select the basic and acidic radicals in the following compounds.
Mg(OH)₂ 

Match the following:

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compounds.

Barium sulphate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Potassium ferrocyanide

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compounds.

Bismuth nitrate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compounds.

Calcium bromide

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Ferrous sulphide 

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Chromium sulphate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Calcium silicate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Stannic oxide

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Sodium zincate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Magnesium phosphate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Sodium thiosulphate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Stannic phosphate

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Nickel bisulphate 

Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.

Potassium manganate

Write the chemical name of the following compound:

Ca₃(PO₄)₂

Write the chemical name of the following compound:

K₂CO₃

Write the chemical name of the following compound:

K₂MnO₄ 

Write the chemical name of the following compound

Mn₃(BO₃)₂

Write the chemical name of the following compound

Mg(HCO₃)₂ 

Write the chemical name of the following compound

Na₄Fe(CN)₆

Write the chemical name of the following compound

Ba(ClO₃)₂ 

Write the chemical name of the following compound

Ag₂SO₃

Write the chemical name of the following compound

(CH₃COO)₂Pb  

Write the chemical name of the following compound

Na₂SiO₃ 

Give the name of the following compound

KCIO

Give the name of the following compound

KClO₂

Give the name of the following compound

KClO₃

Give the name of the following compound

KClO₄ 

Complete the following statement by selecting the correct option :  

The formula of a compound represents 

Complete the following statement by selecting the correct option :

The correct formula of aluminium oxide is

Complete the following statement by selecting the correct option :

The valency of nitrogen in nitrogen dioxide (NO₂) is

Give the name of the element and number of atom of those elements present in the following compound.

Sodium sulphate

Give the name of the element and number of atom of those elements present in the following compound.

Quick lime

Give the name of the element and number of atom of those elements present in the following compound.

Baking soda (NaHCO₃)

Give the name of the element and number of atom of those elements present in the following compound.

Ammonia

Give the name of the element and number of atom of those elements present in the following compound.

Ammonium dichromate

The formula of the sulphate of an element M is M₂(SO₄)₃
Write the formula of it

Chloride

The formula of the sulphate of an element M is M₂(SO₄)₃
Write the formula of it

Oxide

The formula of the sulphate of an element M is M₂(SO₄)₃
Write the formula of it

Phosphate

The formula of the sulphate of an element M is M₂(SO₄)₃
Write the formula of its

Acetate

What is a chemical equation? Why it is necessary to balance it?

State the information conveyed by the following equation:

Zn_(s) + 2HCl_(aq) → ZnCl2_(aq)  + H2 ↑

What is the limitation of the reaction given in question 2?

Write the chemical equation for the following word equation and balance them.

Carbon   + Oxygen → Carbon dioxide

Write the chemical equation for the following word equation and balance them.

Nitrogen + Oxygen → Nitrogen monoxide

Write the chemical equation for the following word equation and balance them.

Calcium + Nitrogen → Calcium nitride

Write the chemical equation for the following word equation and balance them.

Calcium oxide + Carbon dioxide → Calcium carbonate

Write the chemical equation for the following word equation and balance them.

Magnesium + Sulphuric acid → Magnesium sulphate + Hydrogen

Write the chemical equation for the following word equation and balance them.

Sodium reacts with water to form sodium hydroxide and hydrogen

Balance the following equation:

 Fe + H₂O → Fe₃O₄ + H₂

Balance the following equation:

Ca + N₂ → Ca₃N₂

Balance the following equation:

Zn + KOH → K₂ZnO₂ + H₂

Balance the following equation:

Fe₂O₃ + CO → Fe + CO₂

Balance the following equation:

PbO + NH₃ → Pb + H₂O + N₂

Balance the following equation:

Pb₃O₄ → PbO + O₂

Balance the following equation:

PbS + O₂ → PbO + SO₂

Balance the following equation:

S + H₂SO₄ → SO₂ + H₂O

Balance the following equation:

\[\ce{S + HNO3 -> H2SO4 + NO2 + H2O}\]

Balance the following equation:

MnO₂ + HCl → MnCl₂ + H₂O + Cl₂

Balance the following equation:

C + H₂SO₄ → CO₂ + H₂O + SO₂

Balance the following equation:

KOH + Cl₂ → KCl + KClO + H₂O

Balance the following equation:

NO₂ +H₂O → HNO₂ + HNO₃

Balance the following equation:

Pb₃O₄ + HCl → PbCl₂ + H₂O + Cl₂

Balance the following equation:

 H₂O + Cl₂ → HCl + O₂

Balance the following equation:

NaHCO₃ → Na₂CO₃ + H₂O + CO₂

Balance the following equation:

 HNO₃ + H₂S → NO₂ + H₂O + S

Balance the following equation:

P + HNO₃ → NO₂ + H₂O + H₃PO₄

Balance the following equation:

Zn + HNO₃ `→` Zn(NO₃)₂ + H₂O + NO₂

Fill in the blank:

Dalton used symbol _____ for oxygen and _____ for hydrogen.

Fill in the blank:

Symbol represents _____ atom(s) of an element.

Fill in the blank:

Symbolic expression for a molecule is called _____.  

Fill in the blank:

Sodium chloride has two radicals. Sodium is a _____ radical while chloride is _____ radical.

Fill in the blank:

Valency of carbon in CH₄ is _____ , in C₂H₆ _____, in C₂H₄ ___ and in C₂H₂ is ____.

Fill in the blank:

Valency of Iron in FeCl₂ is _____  and in FeCl₃ it is ____ .

Fill in the blank:

Formula of iron (ill) carbonate is _____ .

Complete the following table.

Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate

Write the equation.

Check whether it is balanced, if not balance it.

Find the weights of reactants and products.

State the law which this equation satisfies. 

What information does the following chemical equation convey?

Zn + H₂SO₄ → ZnSO₄+ H₂

Name the fundamental law that is involved in every equation.

What is the valency of :

fluorine in CaF₂ 

What is the valency of :

sulphur in SF₆

What is the valency of :

phosphorus in PH₃ 

What is the valency of :

carbon in CH₄

What is the valency of :

nitrogen in the following compounds:

(i) N₂O₃ (ii) N₂O₅ (iii) NO₂ (iv) NO

What is the valency of manganese in MnO₂?

What is the valency of : 

Copper is Cu₂O

What is the valency of :

Magnesium in Mg₃N₂

Write the balanced chemical equation of the following reaction. sodium hydroxide + sulphuric acid → sodium sulphate + water

Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water

Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.

Write the balanced chemical equations of the following reactions.

chlorine + sulphur dioxide + water →  sulphuric acid + hydrogen chloride

Write the balanced chemical equation of the following reaction.

silver nitrate → silver + nitrogen dioxide + oxygen

Write the balanced chemical equation of the following reaction.

copper + nitric acid → copper nitrate + nitric oxide + water

Write the balanced chemical equation of the following reaction.

ammonia + oxygen → nitric oxide + water

Write the balanced chemical equation of the following reaction.

barium chloride + sulphuric acid → barium sulphate + hydrochloric acid

Write the balanced chemical equation of the following reaction.

zinc sulphide + oxygen → zinc oxide + sulphur dioxide

Write the balanced chemical equation of the following reaction.

aluminium carbide + water → aluminium hydroxide + methane

Write the balanced chemical equation of the following reaction.

iron pyrites(FeS₂) + oxygen → ferric oxide + sulphur dioxide

Write the balanced chemical equation of the following reaction.

Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water

Write the balanced chemical equation of the following reaction.

aluminium sulphate + sodium hydroxide → sodium sulphate + sodium meta aluminate + water.

Write the balanced chemical equation of the following reaction.

aluminium + sodium hydroxide + water → sodium meta aluminate + hydrogen

Write the balanced chemical equation of the following reaction.

potassium dichromate + sulphuric acid → potassium sulphate + chromium sulphate + water + oxygen.

Write the balanced chemical equation of the following reaction.

potassium dichromate + hydrochloric acid → Potassium chloride + chromium chloride + water + chlorine

Write the balanced chemical equation of the following reaction.

sulphur + nitric acid→ sulphuric acid  + nitrogen dioxide + water.

Write the balanced chemical equation of the following reaction.

sodium chloride + manganese dioxide + sulphuric acid → sodium hydrogen sulphate  + manganese sulphate + water + chlorine.

Calculate the molecular mass of the following:

Na₂SO₄.10H₂O

Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

Calculate the molecular mass of the following:

(NH₄)₂CO₃  

Given atomic mass of Cu = 63·5, H = 1, O= 16, C = 12, N = 14, Mg = 24, S = 32

 Calculate the molecular mass of the following:

(NH₂)₂CO   

Given atomic mass of Cu = 63·5, H = 1, O= 16, C = 12, N = 14, Mg = 24, S = 32

Calculate the molecular mass of the following:

Mg₃N₂

Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32

Choose the correct answer from the option given below.

Modern atomic symbols are based on the method proposed by

Choose the correct answer from the options given below.

The number of carbon atoms in a hydrogen carbonate radical is

Choose the correct answer from the options given below.

The formula of iron (III) sulphate is ______.

Choose the correct answer from the options given below.

In water, the hydrogen-to-oxygen mass ratio is 

Choose the correct answer from the options given below.

The formula of sodium carbonate is Na₂CO₃ and that of calcium hydrogen carbonate is

Correct the following statement:

A molecular formula represents an element.

Correct the following statement:

Molecular formula of water is H₂O₂

Correct the following statement:

A molecule of sulphur is monoatomic.

Correct the following statement:

CO and Co  both represents cobalt.

Correct the following statement:

Formula of iron (lll) oxide is FeO.

Calculate the relative molecular masses of the following

CHCI₃

[At mass : C = 12, H = 1, O = 16, Ci = 35.5, N = 14, Cu = 63.5, S = 32, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Calculate the relative molecular masses of the following 

(NH₄)₂ Cr₂O₇

[At mass : C = 12, H = 1, O = 16, Ci = 35.5, N = 14, Cu = 63.5, S = 32, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Calculate the molecular mass of the following:

CuSO₄·5H₂O

Given atomic mass of Cu = 63·5, H = 1, O = 16, C=12, N = 14, Mg = 24, S = 32

Calculate the molecular mass of the following:

(NH₄)₂SO₄

[At mass : C = 12, H = 1, O = 16, Ci = 35.5, N = 14, Cu = 63.5, S = 32, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Calculate the molecular mass of the following:

CH₃COONa

[At mass : C = 12, H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Calculate the molecular mass of the following:

Potassium Chlorate.

At mass : C = 12, H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, Na = 23, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Calculate the molecular mass of the following:

Ammonium chloroplatinate (NH₄)₂ PtCl₆

[At mass: C = 12, H = 1, O = 16, Cl = 35.5, N = 14, Cu = 63.5, S = 32, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]

Give the empirical formula of : Benzene C₆H₆

Give the empirical formula of Glucose C₆H₁₂O₆ .

Give the empirical formula of Acetylene C₂H₂

Give the empirical formula of Acitic Acid CH₃COOH.

Find the percentage of mass water in Epsom salt MgSO₄.7H₂O.

Calculate the percentage of phosphorus in calcium hydrogen phosphate Ca(H₂PO₄)₂ .

Calculate the percentage of phosphorus in calcium phosphate Ca₃(PO₄)₂.

Calculate the percentage composition of each element in Potassium chlorate KCIO₃.

Urea is a very important nitrogenous fertilizer. Its formula is CON₂H₄. Calculate the percentage of carbon in urea. (C = 12, O = 16, N = 14 and H = 1)