Chemistry Periodic Classification Of Elements & Periodicity Online Test

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Question 1

1. Which of the following pairs are chemically dissimilar?

Question 2

2. Which of these Period 3 element has lowest electronegativity?

Question 3

3. The number of elements in fourth period of periodic table is

Question 4

4. The valence shell electronic stricture of an element is ns²np⁵. The element will belong to the group of

Answer

Alkali metals

Answer

Inert metals

Answer

Noble gases

Question 5

5. The property which increases up to group IV-A then decreases onwards

Answer

Atomic radii

Answer

Melting & boiling points

Answer

Ionization energy

Answer

Atomic volume

Question 6

6. The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

Answer

Mg < K < Na < Rb

Answer

Na < K < Rb < Mg

Answer

Mg < Na < Rb < K

Answer

Mg < Na < K < Rb

Question 7

7. Of the given alkali metals, the one with smallest size is

Question 8

8. The element with atomic number 14 belongs to

Answer

2nd period

Answer

5th period

Answer

3rd period

Answer

4th period

Question 9

9. Elements whose outer electronic configuration vary from ns²np¹ to ns¹np⁶ constitute

Answer

p – block elements

Answer

d – block elements

Answer

f – block elements

Answer

s – block elements

Question 10

10. Among the following elements which one has the highest value of first ionization potential?

Question 11

11. Oxidation state of an atomic represent

Answer

No of e lost

Answer

No of e gained

Answer

No of e gained or/lost

Question 12

12. Metallic characters of alkali metals

Answer

No regular trend

Answer

Decrease down the group

Answer

Remain same

Answer

Increase down the group

Question 13

13. Elements with similar chemical properties appear in 1 the

Answer

Right upper corner

Answer

Same family

Answer

p block elements

Answer

Same period

Question 14

14. The atoms of same element having same atomic number bit different mass number are called

Question 15

15. Alkali metals in each period have

Answer

Smallest size

Answer

Highest electronegativity

Answer

Highest IE

Question 16

16. Which of the p-block elements are not representative elements?

Answer

Group-14 elements (IV-A)

Answer

Alkali metals (I-A)

Answer

Group-18 elements (VIII-A)

Answer

Halogens (VII-A)

Question 17

17. Which of the following has highest electropositive character?

Question 18

18. Non-metals usually form ________ oxides.

Answer

Amphoteric

Answer

All of the above

Question 19

19. Which of the following groups may contain a metalloid?

Question 20

20. Which has largest first ionization energy?

Question 21

21. Which one is the strongest reducing agent?

Question 22

22. Which of the following ion is stable in aqueous solution?

Answer

All are stable

Question 23

23. Shielding effect across the period

Answer

Cannot be predicted

Answer

Remains constant

Question 24

24. Number of elements present in the fifth period of periodic table is

Question 25

25. Which of the following pair of atomic numbers represents s-block element?

Question 26

26. Which one is more acidic?

Question 27

27. An element has electronic configuration IS2, 2S2, 2P2 with which group does this element belong to

Question 28

28. Which of the following elements is/are not liquid at 30°C?

Question 29

29. The electronegativity of Si is

Question 30

30. Which of the following set consist of all coinage metals?

Answer

Cu, Fe, Au

Answer

Cu, Hg, Au

Answer

Ag, Au, Hg

Answer

Cu, Ag, Au

Question 31

31. The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

Answer

Electron affinity

Answer

Electronegativity

Answer

Ionization energy

Question 32

32. Among O, C, F, Cl, Br, the correct order of increasing radii is

Answer

C O F Cl Br

Answer

F O C Cl Br

Answer

F Cl Br O C

Answer

F C O Cl Br

Question 33

33. The 14 elements have been placed in VI period and II group of periodic table. These are called

Answer

Alkali metals

Answer

Alkaline earth metals

Answer

Rare earth metals

Answer

Inert gases

Question 34

34. Variable valency is generally exhibited by

Answer

Metallic elements

Answer

None of these

Answer

Transition elements

Answer

Normal elements

Question 35

35. Higher value of electron affinity means

Answer

Atom may form di-positive ion

Answer

Atom will gain electron easily

Answer

Atom will lose electron easily

Answer

The reason is unknown

Question 36

36. Which among the following elements have lowest value of IE₁?

Question 37

37. Which statement is correct?

Answer

Hydrogen resembles in properties with IIA, IIIA and VIIIA elements

Answer

Hydrogen resembles in properties with IIIA, IVA and VA elements

Answer

Hydrogen resembles in properties with IA, IVA and VIIA elements

Answer

Hydrogen resembles in properties with IIA, IVA and VIA elements

Question 38

38. Hydrogen resembles with carbon because of having

Answer

Homovalent (show same valency)

Answer

Similar physical state

Answer

Same number of electrons in the valence shell

Answer

Remarkable reducing properties

Question 39

39. Which one of the following is not a periodic property?

Answer

BP of elements

Answer

Coordination number of icons

Answer

Ionization energy of elements

Answer

MP of elements

Question 40

40. Which discovery caused a revision in periodic law as predicted by Mendeleev?

Answer

Henry Becquerel’s natural radioactivity

Answer

Atomic number by Moseley

Answer

x-rays by Roentgen

Answer

Location of nucleus by Rutherford

Question 41

41. In modern periodic table all the elements are arranged in ascending order of

Answer

Valence electrons

Answer

Atomic mass

Answer

Atomic number

Question 42

42. Elements whose atoms have two outermost shells incomplete are called

Answer

s – block elements

Answer

p – block elements

Answer

f – block elements

Answer

d – block elements

Question 43

43. Which of these Period 3 elements have highest electronegativity?

Question 44

44. Mark the Dobereiner triad

Answer

Zn, Cr, Na

Question 45

45. The highly electronegativity atom is

Question 46

46. Inner transition elements are called

Answer

Lanthanides

Answer

Rare earth metals

Question 47

47. The element with highest first ionization energy is

Question 48

48. The element with atomic number 26 will be found in group

Question 49

49. Best position of hydrogen in the periodic table is above I.A Group which is mainly due to

Answer

Both form ionic compounds

Answer

Both are electropositive

Answer

Similar outer most shell electronic configuration

Question 50

50. Which element was not known when Mendeleev proposed his classification?

Question 51

51. The property which increases up to the middle of the period and then decreases is

Answer

m.P and B.P

Answer

Ionization energy

Answer

Atomic radii

Answer

Atomic volume

Question 52

52. The electron affinity values (in kJ mol¯¹) of three halogens X, Y and Z are respectively – 349, -333 and -325. Then X, Y and Z respectively are:

Answer

Cl, Br and F

Answer

Cl, F and Br

Answer

Br, Cl and F

Answer

F, Cl and Br

Question 53

53. Mark the correct statement

Answer

Melting points of halogens decrease down the group

Answer

Melting point of halogens first increase and then decrease down the group

Answer

Melting points of halogens remains the same throughout the group

Answer

Melting points of halogens increases down the group

Question 54

54. Seventh period contains ____________ normal elements

Question 55

55. Which of the following metal requires radiation of highest frequency to cause emission of electrons?

Question 56

56. The longest period in the modern periodic table is

Answer

2nd and 3rd both

Question 57

57. Which element was not known when Mendeleev proposed his classification?

Question 58

58. Chemically the most similar pair of elements is

Question 59

59. The formation of the oxide ion O²¯ (g) requires first a exothermic and then and endothermic step – as shown below:
O(g) +e – → O
∆Ho = – 142 k3 mol – 1
O– (g) + e– →O2 –(g)
∆Ho = + ∆H° = + 844 kJ mol¯¹
This is because:

Answer

O– ion will tend to resist the addition of another electron

Answer

O– ion has comparatively larger size oxygen atom

Answer

Oxygen has high electron affinity

Answer

Oxygen is more electronegative

Question 60

60. Inner transition elements are called

Answer

Lanthanides

Answer

Rare earth metals

Question 61

61. Oxidation state of an atom represent

Answer

Apparent charge I compound

Answer

Its vacancies

Answer

Number of electrons lost

Answer

Number of electrons gained

Question 62

62. Modern periodic table has been divided in _________ blocks.

Question 63

63. Californium is the member of

Answer

Alkali metals

Answer

Lanthanide series

Answer

Actinide series

Answer

Alkaline earth metals

Question 64

64. The atomic radii decreases by increasing atomic number in

Answer

Alkaline earth metal

Answer

Elements from Li to Ne

Answer

Alkali metal

Answer 125

Having completely filled valence shell

Answer 126

Zero group element

Answer 127

7 horizontal and 7 vertical series

Answer 128

8 horizontal and 18 vertical series

Answer 129

8 horizontal and 7 vertical series

Answer 130

7 horizontal and 18 vertical series

Answer 131

Endothermic

Answer 132

Exothermic

Answer 133

Data is insufficient

Answer 134

All the alkali metals are present in the same period

Answer 135

All the noble gases are present in the same period

Answer 136

All lanthanides are present in the same group

Answer 137

All halogens are present in the same period

Answer 138

N₂ as well as Co₂

Answer 139

Cl⁺ (ions are equal in size)

Answer 140

Na⁺ is larger than Na atom

Answer 141

Cl⁺ is smaller than Cl atom

Answer 142

Na⁺ is smaller than Na atom

Answer 143

Cr, In, Pb

Answer 144

Ca, Cr, Zn

Answer 145

Rutherford

Answer 146

Lother Meyer

Answer 147

Dobereiner

Answer 148

The atomic number

Answer 149

The charge on the nucleus

Answer 150

The shielding constant

Answer 151

Both the nuclear charge and the shielding constant

Answer 152

Ionization potential

Answer 153

Electronegativity

Answer 154

Bonding behavior

Answer 155

Neutron/proton ration

Answer 156

Lother Meyer

Answer 157

Dobereiner

Answer 158

K (at, wt.39.1) has been placed after argon (at, wt. 39.9)

Answer 159

Similar elements like Cu and Zn have been placed in different groups

Answer 160

In spite of their different properties, alkali metals and coinage metals have been grouped together

Answer 161

All above statements are correct

Answer 162

Atomic volume

Answer 163

Atomic mass

Answer 164

Number of valence electrons

Answer 165

Atomic number

Answer 166

Acidic or basic nature of oxides

Answer 167

Charge on its ions

Answer 168

The formula of its oxides

Answer 169

The number of isotopes it has

Answer 170

Both are not found in free state

Answer 171

Both are electropositive

Answer 172

Similar electronic configuration

Answer 173

Group VIII

Answer 174

Group VII A

Answer 175

Ca₃ (PO4)₂

Answer 176

Atomic masses

Answer 177

Atomic numbers

Answer 178

The ionization energy of calcium is higher than that of magnesium

Answer 179

The ionization energy of calcium is lower than that of barium

Answer 180

The ionization energy of calcium is than that of beryllium

Answer 181

The ionization energy of calcium is lower than that of strontium

Answer 182

Elements with atomic number 17 and 38

Answer 183

Elements with atomic numbers 20 and 40

Answer 184

Elements with atomic number 17 and 53

Answer 185

Elements with atomic number 11 and 33

Answer 186

Alkali metal

Answer 187

Elements from Li to Ne

Answer 188

Alkaline earth metal

Answer 189

Both b & c

Answer 190

Alkaline earths

Answer 191

Inert gases

Answer 192

Rare earths

Answer 193

Properties of their compounds

Answer 194

Chemical properties

Answer 195

Physical properties

Answer 196

Group VII-A

Answer 197

Group VI-A

Answer 198

Group II-A

Answer 199

Group IV-A

Answer 200

Sb < As < S < P < Cl

Answer 201

As < Cl < P < S < Sb

Answer 202

Cl < Sb < P < As < S

Answer 203

Sb < As < Cl < S < P

Total Questions:	107
Time Allowed:	60 Minutes
Total Marks:	107
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Periodic Classification Of Elements & Periodicity Question and Answer

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