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1 : In Mendeleev's periodic law the properties of elements are periodic functions of their:

1 : Volume

2 : Densities

3 : Atomic number

4 : Atomic masses

2 : Who gave the law of triads in 1829?

1 : Dobereiner

2 : Moseley

3 : Newland

4 : Mendeleev

3 : The basis of modern periodic law is:

1 : Electron affinity

2 : Atomic number

3 : Atomic masses

4 : Ionization Energy

4 : The concept of atomic number was introduced by:

1 : AL-Razi

2 : Moseley

3 : Mendeleev

4 : Dobereiner

5 : The number of groups present in modern periodic table are:

1 : 8

2 : 7

3 : 12

4 : 18

6 : Lother Meyer plotted atomic weight against which property of elements to get his famous curves.

1 : Atomic volume

2 : Density

3 : Atomic number

4 : Ionization Energy

7 : The number of elements at present in modern periodic table are?

1 : 118

2 : 100

3 : 65

4 : 63

8 : In modern periodic table 6th period contains elements?

1 : 8

2 : 18

3 : 10

4 : 32

9 : In periodic table all the non-metals are placed under which of the blocks?

1 : d

2 : s

3 : p

4 : f

10 : Which one increases from top to bottom in a group?

1 : Atomic radius

2 : Ionization Energy

3 : electron affinity

4 : Oxidation state

11 : The elements of group II-A are called:

1 : Alkali metals

2 : Alkaline earth metals

3 : Coinage metals

4 : Metaloids

12 : In older version of periodic table, the representative elements belong to which sub-group?

1 : sub-group A

2 : sub-group B

3 : sub-group C

4 : sub-group D

13 : Correct order according to Atomic size in the following is:

1 : Na>K

2 : Be>Mg

3 : O>N

4 : Cl>F

14 : Most of the elements are:

1 : Metals

2 : Non-Metals

3 : Metaloids

4 : Crystalloids

15 : The most non-metallic elements of the periodic table is:

1 : Nitrogen

2 : Fluorine

3 : Oxygen

4 : Carbon

16 : Which of the following element has lowest ionization energy?

1 : Beryllium

2 : Boron

3 : Carbon

4 : Oxygen

17 : Among the elements of 2nd period, which has highest ionization energy?

1 : Be

2 : C

3 : N

4 : Ne

18 : Minimum amount of energy required to move an electron from its gaseous atom is called:

1 : Ionization energy

2 : Oxidation

3 : reduction

4 : electron affinity

19 : The value of third ionization energy of Ca is:

1 : 1450 kJmol⁻¹

2 : 7730 kJmol⁻¹

3 : 4940 kJmol⁻¹

4 : 1190 kJmol⁻¹

20 : Which element has highest ionization potential?

1 : Li

2 : Be

3 : B

4 : He

21 : Ionization energy for Na → Na⁺ + 1e⁻ has ΔH is:

1 : 378 KJ/mol

2 : 494 KJ/mol

3 : 294 KJ/mol

4 : 138 KJ/mol

22 : Electron affinity is the amount of energy released when:

1 : covalent bond of the molecule is broken

2 : electron is added to gaseous atom

3 : electron is removed to gaseous atom

4 : covalent bond is formed between atoms

23 : Which one of the element has the maximum electron affinity?

1 : F

2 : Cl

3 : B

4 : I

24 : The tendency of an atom to attract shared pair electron towards itself is called its:

1 : Electronegativity

2 : Electron affinity

3 : ionization energy

4 : lattice energy

25 : The highest electronegative element in periodic table is:

1 : oxygen

2 : nitrogen

3 : chlorine

4 : fluorine

26 : Electronegativity of fluorine is:

1 : 1

2 : 2

3 : 3

4 : 4

27 : Zinc oxide is:

1 : Basic

2 : Acidic

3 : Neutral

4 : Amphoteric

28 : The oxide of non-metals are:

1 : Acidic

2 : Amphoteric

3 : Neutral

4 : Basic

29 : Which one of the following elements forms amphoteric oxide?

1 : Ca

2 : Fe

3 : S

4 : Al

30 : Oxides of beryllium are:

1 : Basic

2 : Acidic

3 : Amphoteric

4 : Neutral

31 : Which one of the following element forms Acidic oxide?

1 : Aluminium

2 : sulphur

3 : Sodium

4 : Zinc

32 : Which one is Amphoteric oxide?

1 : SO₃

2 : MgO

3 : Al₂O₃

4 : Na₂O

33 : Oxide of metals are:

1 : Amphoteric

2 : Acidic

3 : Basic

4 : Neutral

34 : In SO₃ the oxidation number of sulphur is:

1 : -8

2 : 4+

3 : 6-

4 : 6+

35 : In H₂SO₄ the oxidation number of S is:

1 : +2

2 : +6

3 : +4

4 : +8

36 : Sulphur has highest oxidation state in:

1 : SO₃

2 : SO₂

3 : H₂S

4 : H₂SO₃

37 : Recognize the element if it has 3 electron shells, belongs to 's' block and has 2 electrons in the outer most shell:

1 : Calcium

2 : Sodium

3 : Magnesium

4 : Potassium

38 : Which scientist first time observed the periodicity in the elements?

1 : A.J. Newlands

2 : L. Meyer

3 : J.W. Dobereiner

4 : Moseley

39 : Which one do you think is correct about metallic character?

1 : It decreases from top to bottom in a group

2 : It increases from top to bottom in a group

3 : It increases from left to right in a period

4 : It decreases from left to right in a period

40 : Which property increases as you go down a group in a periodic table?

1 : Atomic radius

2 : Electron affinity

3 : Ionization energy

4 : Electronegativity

41 : Which of the following atoms show more than one (variable) oxidation state?

1 : Sodium

2 : Magnesium

3 : Aluminum

4 : Phosphorous

42 : Which is the correct general trend in variation of electron affinity in a group?

1 : It becomes less negative from top to bottom in a group

2 : It becomes more negative from top to bottom in a group

3 : It remains the same

4 : It has no definite trend and change

43 : What is oxidation state of sulfur in sulfate (SO₄²⁻)?

1 : +2

2 : +6

3 : +4

4 : 0

44 : Which is the correct trend in variation of electronegativity along a period of a periodic table?

1 : It decreases from left to right across a period

2 : It increases from left to right across a period

3 : It has no definite trend

4 : It remains constant

45 : The atomic radius generally ______ across a period in periodic table

1 : Increases

2 : Decreases

3 : Remain constant

4 : no trend

46 : Which one of the following element has highest ionization energy?

1 : Sodium

2 : Sulfur

3 : Aluminum

4 : Magnesium

47 : What is oxidation state of sulfur in sulfite (SO₃²⁻)?

1 : +4

2 : +6

3 : +2

4 : 0

48 : Which one of the element has maximum electron affinity?

1 : F

2 : Cl

3 : Br

4 : I

49 : Elements of which group form anions readily?

1 : Oxygen

2 : Nitrogen

3 : Alkali metals

4 : Halogens

50 : Which of the following are Alkaline earth metals?

1 : Be, Mg, Ca

2 : Li, Na, K

3 : Fe, Co, Ni

4 : B, Al, Ga

51 : Which pair has both members from same period in periodic table?

1 : Na-Cl

2 : Na-Ca

3 : Ca-Cl

4 : Cl-Br

52 : Which of the following is amphoteric oxide?

1 : Al₂O₃

2 : Na₂O

3 : SO₃

4 : P₂O₃

53 : The number of periods and groups in modern periodic table are:

1 : 18 periods and 18 groups

2 : 7 periods and 18 groups

3 : 7 groups and 18 periods

4 : 7 groups and 7 periods

54 : Which is not an alkali metal?

1 : Francium

2 : Caesium

3 : Rubidium

4 : Radium

55 : Which of the following is not basic in nature?

1 : Aluminium oxide

2 : Sodium oxide

3 : Magnesium oxide

4 : Potassium oxide

56 : Which of the following has smallest atomic radius?

1 : Mg

2 : P

3 : S

4 : Na

57 : Why fluorine has less electron affinity as compare to chlorine?

1 : Electronegativity

2 : Thick small electronic cloud

3 : Seven electron in outermost shell

4 : Higher ionization energy

58 : Which one of them is amphoteric in nature?

1 : Beryllium oxide

2 : Lithium oxide

3 : Calcium oxide

4 : Potassium oxide

59 : Which of the following has the highest atomic radius in its period?

1 : Alkaline earth metals

2 : Alkali metals

3 : Halogens

4 : Chalcogens

60 : Which group of the periodic table contains non-metals, metalloids and metals?

1 : 1B

2 : 4A

3 : 7A

4 : 6A

61 : Which of the following element has smaller size?

1 : Na

2 : Al

3 : Li

4 : K

62 : AlCl₃ is which type of Halide?

1 : acidic

2 : basic

3 : Neutral

4 : Amphoteric

63 : Which of the following has largest atomic radius?

1 : Na

2 : K

3 : Rb

4 : Ca

64 : The first ionization energy is lowest for?

1 : Na

2 : Mg

3 : K

4 : Al

65 : Arrange the following elements according to trend of ionization energies (C, N, Ne, B)

1 : Ne < N < C < B

2 : B < C < N < Ne

3 : B < N < C < Ne

4 : Ne < B < C < N

66 : More the ionization energy of an element means?

1 : More the electropositivity

2 : More the reducing power

3 : Less the metallic character

4 : Bigger the atomic radius

67 : Ionization energy decreases down the group from top to bottom due to?

1 : Increase in atomic mass

2 : Increase in proton number

3 : Decrease in atomic size

4 : Increase in shielding effect of the intervening electrons

68 : Which one remains same along a period?

1 : Atomic radius

2 : Melting point

3 : Number of Shells

4 : Electrical conductivity

69 : In modern periodic table, elements are arranged in the ascending order of:

1 : Atomic masses

2 : Atomic number

3 : Valence Electron

4 : Valency

70 : The first ionization energy is higher for the:

1 : Alkaline earth metals

2 : Alkali metals

3 : Halogens

4 : Noble gases

71 : Which of the following elements form acidic halides?

1 : P

2 : Mg

3 : Na

4 : All of these

Chemistry 11th MCQs || Ilam Ghar