ICSE CHEMISTRY 100 MCQs with solutions

Solutions of ICSE CHEMISTRY Class 10 - 100 MCQs 

Question 1

The element with 2 shells and 3 valence electrons is:

C) metalloid

 

Question 2

The periodic property of elements which increases with increase in atomic radius:

D) Metallic character

 

Question 3

The elements present in the same group show similarities in their properties because:

B) they have same number of valence electrons

 

Question 4

The atomic size ________ down the group in The Periodic Table hence the density ____________.

B) increases, decreases

Question 5

The element which has 3 electrons in M-shell of its atom:

D) Aluminium

 

Question 6

The most electropositive element among the following elements:

A) Alkali metals

 

Question 7

The most electro-negative elements belong to:

C) Group VIIA/17

 

Question 8

The ascending order of Electron Affinity:

D) I<Br<F<Cl

 

Question 9

Helium has the highest Ionization potential because:

D) It has stable electronic configuration

 

Question 10

As the nuclear pull increases on the valence electrons, the electronegativity __________.

A) increases

 

Question 11
Two elements X and Y have 2 and 7 valence electrons respectively and they have same number electron shells. When their Electron affinities are compared:

B) X<Y

 

Question 12

Boron shows similarity in properties of:

D) Silicon

 

 

Question 13

The element which has 1 valence electron but not a metal:

C) Hydrogen

 

 

Question 14

Which of the following statements is not true about halogens?

C) least reactive among non-metals

 

Question 15

Which of the following elements has least metallic character?

C) Aluminium

 

Question 16

Which of the following is odd in terms of physical properties?

A) H

 

Question 17-20

	1	2	13	14	15	16	17	18
1	H							R
2						Y		Ne
3		X		M
4	Z

 

Question 17

If the X combines with Y:

A) X loses 2 electrons and oxidized

 

Question 18

The number of valence electrons present in R:

A) 2

 

Question 19

The element which shows metallic and non-metallic character:

B) M

Question 20

The sulphate of Z is:

B) Z₂SO₄

 

Question 21

An element has 5 electrons in its valence shell. How many electrons that one atom of this element contributes for the formation of Covalent bond?

C) 3

Question 22

Two elements A and B have 2 and 7 valence electrons respectively. The nature of the compound formed between them:

B) exists in crystalline state at room temperature

Question 23

Which of the following statements is true about Ammonia molecule?

D) both A) and C)

 

Question 24

P is a metal which combines with Oxygen to form a compound with formula P₂O₃ the change that P undergoes is:

D) both B and C

 

Question 25

The electronic configuration of Chlorine after the formation of Ionic bond with Magnesium:

B) 2,8,8

Question 26

If a substance contains only molecules then:

C) It is volatile

 

Question 27

Which of the following compounds has strong electrostatic force ?

B) Sodium chloride

Question 28

The weak force of attraction that exist between the non-polar covalent molecules:

D) Van der Waal’s force

 

Question 29

The number of electrons present in the valence shell of Oxygen in Calcium Oxide:

C) 8

 

Question 30

The statement which is not true about Sodium ion:

C) has 1 valence electron

 

Question 31

How many electrons does one Magnesium atom donate to each atom of Chlorine in the formation of Magnesium chloride?

A) 1

Question 32

An element has 5 valence electrons in its atom then it combines with:

D) 3 Hydrogen atoms and forms 3 covalent bonds

 

Question 33

Which of the following statements is true about the electrovalent compounds?

A) non-volatile

Question 34

In the formation of an ionic bond, ______ atom loses electron/s to form ________ and _______ atom gains electron/s to form _______.

C) metal, cation, non-metal, anion

Question 35

The polar covalent compound is formed due to:

D) difference in the electronegativity of the combined elements

 

 

Question 36

When Hydrogen chloride is dissolved in water:

B) HCl ionizes and Hydrogen ion combines with water molecule to form Hydronium ion

Question 37-40

P, Q, R and S are the elements with atomic number 6, 11, 16 and 8 respectively.

Question 37

The formula of the compound between Q and S:

B) Q₂S

 

Question 38

The number of bonds formed by the element P :

D) 4 covalent bonds

 

Question 39

The type of bonding between Q and R :

C) Ionic bond

 

Question 40

Which of the following equations is correct?

C) 4Q + S₂ → 2Q₂S

 

Question 41

A weak organic acid:

D) Acetic acid

 

Question 42

A strong base which is soluble in water:

A) Sodium hydroxide

 

Question 43

A salt which is formed by the partial neutralization of an acid with a base:

A) Normal salt

B) complex salt

C) acid salt

D) basic salt

 

Question 44

Which of the following salts is not a complex salt?

B) Common salt

 

Question 45

Which of the following salts react with an acid to produce a gas with rotten egg smell?

D) sodium sulphide

 

Question 46

An acid whose basicity is not 1:

A) H₂SO₄

 

Question 47

A salt formed by complete neutralization of Sulphuric acid:

C) Sodium sulpahte

 

Question 48

A gas produced when dilute HCl is added sodium sulphite:

C) turns lime water milky and decolourizes acidified KMnO₄

 

Question 49

When Ammonium hydroxide is added to Copper sulphate:

A) It gives pale blue ppt. in small amounts and inky blue solution in excess

Question 50

A salt solution when treated with small amounts of Ammonium hydroxide gives a gelatinous white ppt which dissolves in excess Ammonium hydroxide:

D) ZnCl₂

 

Question 51

A salt solution which gives a white ppt. with Sodium hydroxide but not with Ammonium hydroxide:

C) CaCl₂

Question 52

This salt solution gives a greenish white ppt with barium chloride:

B) FeSO₄

 

Question 53

Which of the following metals gives Hydrogen gas with Sodium hydroxide?

C) Al

Question 54

A strong mono basic acid ‘X’ reacts with a strong alkali to produce a salt. Then the salt is :

A) a normal salt

Question 55

Which of the following substances releases reddish brown gas on thermal decomposition?

D) Lead nitrate

 

Question 56

A salt solution has pH value 7.2, when an alkali is added to this solution:

B) The pH increases

 

Question 57

A greenish yellow gas:

C) Chlorine gas

Table for Question 58-60

Solution	pH
A	2.3
B	7.0
C	12.7
D	7.9

 

Question 58

Which of these can produce highest number of hydroxyl ions in its aqueous solution?

C) C

 

Question 59

The solution which can produce Hydrogen gas with an active metal

A) A

 

Question 60

When Phenolphthalein indicator is added to the solution C it turns:

D) pink

 

Question 61

The Vapour density of Methane :

At.  wt. H – 1, C – 12

C) 8

 

Question 62

If the Vapour Density of a compound is equal to the Empirical formula wt. the n=____

D) 2

 

Question 63

If the Molecular formula and the empirical formula of the compound are same then:

C) 2xVD = EFwt.

 

Question 64

If a compound has EF - C₂H₃ then the molecular formula of the compound could be :

D) C₄H₆

 

Question 65

The percentage of Oxygen in Sulphuric acid:

At. wt. H-1, O-16, S-32

B) 65.30%

 

Question 66

The percentage composition of a compound is Na- 29.11%, S- 40.50%, O – 30.37%. Find the EF of that compound:

at. wt. O-16, Na-23, S-32

C) Na₂S₂O₃

 

 

Question 67

The EF formula of a compound is NH₂ and its RMM is 32 then :

(At. wt. H-1, N-14)

B) n=2 and MF is N₂H₄

 

Question 68

The Empirical Formula of Glucose is:

A) CH₂O

 

Question 69

The EF wt of water is:

(at wt. H-1, O-16)

C) 18

Question 70

The EF of a compound is CH and n=6 then the molecular formula is

B) C₆H₆

 

Question 71

9.6g of Magnesium is burnt completely in presence of sufficient Oxygen to form 16g of Magnesium oxide then find the percentage of Oxygen in the product:

A) 40%

 

Question 72

A hydrocarbon contains 75% of Carbon and _________ % of Hydrogen in it:

C) 25%

 

Question 73

The Molecular wt of a compound is 90 and the EF wt is 30 then :

C) n=3

 

Question 74

Find the relative molecular mass of Sodium carbonate

At. wt. C-12, O-16, Na-23

D) 106

 

 

Question 75

Find the percentage of water in Copper sulphate crystals (CuSO₄.5H₂O)

(At.wt. H-1, O-16, S-32, Cu-64)

C) 36%

 

Question 76

If 20% percent of a Hydrocarbon is Hydrogen, the mass of the Carbon present in 50 g of that Hydrocarbon:

D) 40g

 

Question 77

The vapour density of a compound is found to be twice the EF wt. then:

C) RMM = 4x EF Mass

 

Question 78

The simplest whole number ratio of the number of atoms of each element present in a given compound is:

C) Empirical Formula

Question 79

3.96 g of a gas occupies a volume of 2lit and 0.09g of Hydrogen occupies 1lit volume. Then the vapour density of the gas is:

B) 22

Question 80

Vapour density of a compound is:

C) Half of the RMM

 

Question 81

The compound which undergoes complete dissociation:

A) Strong electrolyte

 

Question 82

Which of the following compounds conducts large amount of electricity through its aqueous solution?

C) Sodium chloride

 

Question 83

During electrolysis:

A) cations migrate to negative electrode

 

Question 84

The cation which gets reduced first during the electrolysis of a solution which contains Cu²⁺ ,  Ag⁺  and H⁺ of the same concentration :

B) Ag⁺

Question 85

When fused Lead bromide is electrolyzed using graphite electrodes the product formed at cathode is:

C) Lead metal

 

Question 86

The observation at anode during the above electrolysis process:

D) Reddish brown vapours

 

Question 87

The acid added to water before its electrolysis is:

C) Sulphuric acid because it is a non-volatile acid

 

 

Question 88

The cathode reaction during the electrolysis of Copper sulphate solution using Copper electrodes:

C) Cu²⁺ + 2e^- → Cu

 

Question 89

The colour of the copper sulphate solution, during the electrolysis using Copper electrodes:

B) does not fade

 

Question 90

The electrolyte used in electroplating an article with Silver is:

C) Sodium Silver cyanide because its gives long lasting coating of Silver metal

 

Question 91

The anode reaction during electroplating an article with Nickel metal using Nickel sulphhate:

A) Ni – 2e^- → Ni²⁺

 

Question 92

Which of the following metals has to be electro-refined?

D) Copper

 

Question 93

The anode in the electro-refining of Impure copper metal using Copper sulpahte solution:

A) A block of impure copper

 

Question 94

Which of the following metals can be extracted from its compound by Electrolysis only?

D) Aluminium

 

Question 95

Which of the following ions is most difficult to oxidize?

C) Potassium ion

 

Question 96

The product at cathode in electrolysis of concentrated Sodium chloride solution:

B) Hydrogen gas

 

Question 97

The electrolysis of a salt XY₂ gives:

A) Metal X at cathode

 

Question 98

During electrolysis of a fused salt:

C) The cations get reduced at cathode

 

Question 99

Two water soluble compounds X  and Y are inserted in an electric circuit and it is observed that X conducts less amount of electricity compared to Y, then:

C) X is a weak electrolyte compared to Y

 

Question 100

The essential condition for substance to be electrolyzed:

D) must have free ions in its molten state or aqueous solution

 

Question 101

The number of electron pairs (bond pairs) being shared between the Oxygen atoms in an Oxygen molecule:

B) 2

 

Question 102

Ammonium chloride contains:

D) all of the above

 

Question 103

Formation of a coordinate covalent bond is:

C) a consequence of presence of lone pair

 

Question 104

In the formation of Magnesium chloride, Magnesium achieves the electronic configuration of :

 B) Neon