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Fundamentals of Chemistry 

Encircle the most appropriate answer among the following options

1          The branch of chemistry which deals with the study of all elements and their compounds except compounds of carbon and hydrogen and their derivatives is called.

(a) Organic chemistry

(b) Physical chemistry

(c)  Inorganic chemistry

(d) Biochemistry

2          Which one of the followings provides the identity of a substance?

(a) Qualitative analysis

(b) Clinical analysis

(c)  Quantitative analysis

(d) Chemical analysis

3          Which one of the followings is applicable in chemical industry like metallurgy, ceramics and glass?

(a) Organic chemistry

(b) Inorganic chemistry

(c) Industrial chemistry

(d) Nuclear chemistry

4          Anything that has mass and occupies space is called:

(a) Substance

(b) Matter

(c) Element

(d) Atomic mass

5          The number of elements known in early ages is:

(a) 118

(b) 109

(c) 63

(d) 9

6          Until the end of 19th century how many elements were discovered?

(a) 9

(b) 63

(c) 92

(d) 118

7          The percentage of aluminum in crust of earth is:

(a) 47%

(b) 28%

(c) 7.8%

(d) 1.8%

8          Which one of the following elements is liquid at room temperature?

(a) Bromine

(b) Mercury

(c) Nitrogen

(d) Both a & b

9          Piece of matter in pure form is called:

(a) Mixture

(b) Matter

(c) Substance

(d) Compound

10        The quantity of potassium, magnesium, sulphur and sodium in human body is:

(a) 0.2%

(b) 0.6%

(c) 0.8%

(d) 0.4%

11        The unique property of an element is called:

(a) Electronegativity

(b) Valency

(c) Mobility

(d) Oxidation number

12        In water fixed ratio of hydrogen and oxygen by mass is:

(a) 8:1

(b) 2:16

(c) 1:8

(d) 2:1

13        The mixture which has uniform composition throughout is called:

(a) Simple mixture

(b) homogeneous mixture

(c) Heterogeneous mixture

(d) Compound mixture

14        Which one of the followings is the mixture of oxygen, nitrogen and carbon dioxide?

(a) Soil

(b) Water

(c) Air

(d) Brass

15        The sum of protons and neutrons in the nucleus of an atom is called:

(a) Atomic number

(b) Mass number

(c) Formula mass

(d) Atomic mass 

16        A substance whose atoms have the same atomic number is called:

(a) Element

(b) Substance

(c) Mixture

(d) Compound

17        H2O is an example of:

(a) Radical cation

(b) Radical anion

(c) Compound

(d) Element

18        One mole of any material contains chemical units equal to:

(a) 6.02×1023

(b) 6.02×1024

(c) 6.02×10-24

(d) 6.02×1025

19        Ion, molecular ions, free radicals and neutral molecules are called

(a) Ionic species

(b) Molecular species

(c) Chemical species

(d) Atomic species

20        Noble gases are the best examples of:

(a) Monoatomic molecules

(b) Hetero atomic molecules

(c) Polyatomic molecules

(d) Diatomic molecules

21        Brass is the mixture of:

(a) Cu+Zn

(b) Cu+Pb

(c) Zn+Pb

(d) Sn+Cu

22        The molar mass of H3PO4 is:

(a) 58.5g

(b) 98g

(c) 40g

(d) 98amu

23        The number of particles in one mole of a substance is called:

(a) Atomic number

(b) Particle number

(c) Avogadro’s number

(d) Mass number

24        lamu (atomic mass unit) is equivalent to:

(a) 1.66×1023g

(b) 1.66×10-24g

(c) 1.66×10-23g

(d) 6.02×10-25 g

25        The sum of atomic masses of all the atoms in one formula unit of a substance is called:

(a) Atomic mass

(b) Mass number

(c) Formula mass

(d) Atomic mass unit

26        Which one of the followings shows the simplest whole number ratio of atoms in a substance?

(a) Molecular formula

(b) Empirical formula

(c) Chemical formula

(d) Covalent formula

27        Chemical formula of washing soda is:

(a) Na2CO3.H2O

(b) Na2CO3.10H2O

(c) Na2CO3.7H2O

(d) Na2CO3

28        Mass of an electron is:

(a) 5.486×10-4amu

(b) 9.106×10-28amu

(c) 1.672×10-24 g

(d) 1.677×10-24 g

29        Which one of the followings is a reactive species?

(a) Molecule

(b) Molecular ion

(c) Compound

(d) Formula unit

30        An atom or group of atoms having odd number of electrons is called:

(a) Radical

(b) Ion

(c) Free radical

(d) Molecular ion

31        Which one of the followings is tri atomic molecule?

(a) H2SO4

(b) N2

(c) CO2

(d) HCI

32        The formula mass of an ionic compound expressed in grams is called

(a) Gram formula mass

(b) Gram formula

(c) Mole

(d) All of these

33        The total number of ions in one mole of NaCl is:

(a) 12.04×1023 ions

(b) 1.204×1023 ions

(c) 6.04×1023 ions

(d) 61.04×1023 ions

34        Number of molesX6.02×1023is equal to:

(a) Number of moles

(b) Number of particles

(c) Mass of substance

(d) Mass of particles

35        The symbol for nitride radical is:

(a) CO23

(b) N3

(c) PO34

(d) S2O23

36        It is a liquid element at room temperature

(a) Mercury

(b) Nickel

(c) Hydrogen

(d) Iodine

37        Mass of proton is equivalent to:

(a) 1.672×10-24amu

(b) 16.72×10-24g

(c) 1.672×1024g

(d) 1.672×10-24g

38        The number of neutrons in 92U238 is:

(a) 194

(b) 92

(c) 146

(d) 238

39        An atom or group of atoms having positive charge on it is called:

(a) Cation

(b) Anion

(c) Molecule

(d) Atom

40        Which of the followings shows variable valency?

(a) Ca

(b) Fe

(c) B

(d) I

41        Which one of the following elements is found most abundantly in the earth crust?

(a) Oxygen

(b) Aluminium

(c) Silicon

(d) Iron

42        The third abundant gas found in the atmosphere is:

(a) Carbon monoxide

(b) Oxygen

(c) Nitrogen

(d) Argon

43        Total number of elements which have been discovered till now are:

(a) 110

(b) 115

(c) 118

(d) 102

44        Which element is found in liquid state?

(a) Gold

(b) Bromine

(c) Lead

(d) Silver

45        The compound which has same empirical formula is:

(a) C6H6

(b) C6H12O6


(d) Both b and c

46        CaO is the chemical formula of:

(a) Lime stone

(b) Quick lime

(c) Caustic soda

(d) Slaked lime

47        How many elements occur naturally?

(a) 92

(b) 96

(c) 98

(d) 100

48        HSO-14, is the symbol of which one of the following?

(a) Ammonium ion

(b) Cyanide

(c) Bisulphate

(d) Bicarbonate

49        The formula mass of K2SO4 is:

(a) 174 amu

(b) 174g

(c) 170 amu

(d) 170 g

50        Which one of the following has a sharp and fixed melting point?

(a) Compound

(b) Mixture

(c) Both

(d) None of these