Classification of Elements and Periodicity in Properties Test

Question 1
1 / -0

Consider the isoelectronic species, \(Na ^+\) , \(Mg ^{2+}\) , \(F ^-\) and \(O ^{2-}\) . The correct order of increasing length of their radii is........

A
\(F^-< O^{2-}< Mg^{2+}<Na^+\)

B
\(Mg^{2+}< Na^+< F^–< O^{2-}\)

C
\(O^{2-}< F^-< Na^+< Mg^{2+}\)

D
\(O^{2-}< F^-< Mg^{2+}< Na^+\)

Question 2
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Which of the following is not an actinoid?

A
Curium (Z = 96)

B
Californium (Z = 98)

C
Uranium (Z = 92)

D
Terbium (Z = 65)

Question 3
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Which of the following elements can show covalency greater than 4?

(i) Be

(ii) P

(iii) S

(iv) B

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 4
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Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame?

(i) 2

(ii) 13

(iii) 1

(iv) 17

A
(ii),(iii)

B
(ii),(iv)

C
(i),(iii)

D
(i),(iv)

Question 5
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The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons is:

A
s > p > d > f

B
f > d > p > s

C
p < d < s > f

D
f > p > s > d

Question 6
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In the following questions a statement of Assertion (A) followed by a statement of reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Generally, ionisation enthalpy increases from left to right in a period.

Reason (R): When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus.

A
Assertion is correct statement and reason is wrong statement

B
Assertion and reason both are correct statements and reason is correct explanation of assertion

C
Assertion and reason both are wrong statements

D
Assertion is wrong statement and reason is correct statement

Question 7
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Match the correct atomic radius with the element.

Element Atomic radius (pm)

(i) Be (a) 74

(ii) C (b) 88

(iii) O (c) 111

(iv) B (d) 77

(v) N (e) 66

A
(i) → (c) (ii) → (b) (iii) → (d) (iv) → (e) (v) → (a)

B
(i) → (c) (ii) → (a) (iii) → (e) (iv) → (b) (v) → (d)

C
(i) → (a) (ii) → (d) (iii) → (e) (iv) → (b) (v) → (c)

D
(i) → (c) (ii) → (d) (iii) → (e) (iv) → (b) (v) → (a)

Question 8
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The first ionisation enthalpies of Na, Mg, Al and Si are in the order:

A
Na < Mg > Al < Si

B
Na > Mg > Al > Si

C
Na < Mg < Al < Si

D
Na > Mg > Al < Si

Question 9
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The electronic configuration of gadolinium (Atomic number 64) is

A
\( [Xe]\, 4f^3\,5d^5\,6s^2\)

B
\( [Xe]\, 4f^7\,5d^2\,6s^1\)

C
\( [Xe]\, 4f^7\,5d^1\,6s^2\)

D
\( [Xe]\, 4f^8\,5d^6\,6s^2\)

Question 10
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Which of the following sequences contain atomic numbers of only representative elements?

(i) 3, 33, 53, 87

(ii) 2, 10, 22, 36

(iii) 7, 17, 25, 37, 48

(iv) 9, 35, 51, 88

A
(i),(iv)

B
(iii),(iv)

C
(ii),(iii)

D
(i),(ii)

Question 11
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The statement that is not correct for periodic classification of elements is:

A
The properties of elements are periodic function of their atomic numbers

B
Nonmetallic elements are less in number than metallic elements

C
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals

D
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

Question 12

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Match the correct ionisation enthalpies and electron gain enthalpies of the following elements

Elements	\(\Delta H_1\,\Delta H_2\,\Delta_{eg} H\)
(i) Most reactive nonmetal	(a) 419 3051 -48
(ii) Most reactive metal	(b) 1681 3374 -328
(iii) Least reactive element	(c) 738 1451 -40
(iv) Metal forming binary halide	(d) 2372 5251 +48

(i) → (b) (ii) → (c) (iii) → (d) (iv) → (a)

(i) → (b) (ii) → (a) (iii) → (d) (iv) → (c)

(i) → (b) (ii) → (a) (iii) → (c) (iv) → (d)

(i) → (d) (ii) → (a) (iii) → (c) (iv) → (b)

Question 13
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Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:

A
F > Cl > Br > I

B
F < Cl < Br < I

C
F < Cl > Br > I

D
F < Cl < Br < I

Question 14
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Which of the following elements will gain one electron more readily in comparison to other elements of their group?

(i) S (g)

(ii) Na (g)

(iii) O (g)

(iv) Cl (g)

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 15
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The period number in the long form of the periodic table is equal to

A
Magnetic quantum number of any element of the period

B
Atomic number of any element of the period

C
Maximum Principal quantum number of any element of the period

D
Maximum Azimuthal quantum number of any element of the period

Submit Test

Element	Atomic radius (pm)
(i) Be	(a) 74
(ii) C	(b) 88
(iii) O	(c) 111
(iv) B	(d) 77
(v) N	(e) 66

Classification ...

Question 1

\(F^-< O^{2-}< Mg^{2+}<Na^+\)

\(Mg^{2+}< Na^+< F^–< O^{2-}\)

\(O^{2-}< F^-< Na^+< Mg^{2+}\)

\(O^{2-}< F^-< Mg^{2+}< Na^+\)

Question 2

Curium (Z = 96)

Californium (Z = 98)

Uranium (Z = 92)

Terbium (Z = 65)

Question 3

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 4

(ii),(iii)

(ii),(iv)

(i),(iii)

(i),(iv)

Question 5

s > p > d > f

f > d > p > s

p < d < s > f

f > p > s > d

Question 6

Assertion is correct statement and reason is wrong statement

Assertion and reason both are correct statements and reason is correct explanation of assertion

Assertion and reason both are wrong statements

Assertion is wrong statement and reason is correct statement

Question 7

(i) → (c) (ii) → (b) (iii) → (d) (iv) → (e) (v) → (a)

(i) → (c) (ii) → (a) (iii) → (e) (iv) → (b) (v) → (d)

(i) → (a) (ii) → (d) (iii) → (e) (iv) → (b) (v) → (c)

(i) → (c) (ii) → (d) (iii) → (e) (iv) → (b) (v) → (a)

Question 8

Na < Mg > Al < Si

Na > Mg > Al > Si

Na < Mg < Al < Si

Na > Mg > Al < Si

Question 9

\( [Xe]\, 4f^3\,5d^5\,6s^2\)

\( [Xe]\, 4f^7\,5d^2\,6s^1\)

\( [Xe]\, 4f^7\,5d^1\,6s^2\)

\( [Xe]\, 4f^8\,5d^6\,6s^2\)

Question 10

(i),(iv)

(iii),(iv)

(ii),(iii)

(i),(ii)

Question 11

The properties of elements are periodic function of their atomic numbers

Nonmetallic elements are less in number than metallic elements

For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals

The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

Question 12

(i) → (b) (ii) → (c) (iii) → (d) (iv) → (a)

(i) → (b) (ii) → (a) (iii) → (d) (iv) → (c)

(i) → (b) (ii) → (a) (iii) → (c) (iv) → (d)

(i) → (d) (ii) → (a) (iii) → (c) (iv) → (b)

Question 13

F > Cl > Br > I

F < Cl < Br < I

F < Cl > Br > I

F < Cl < Br < I

Question 14

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 15

Magnetic quantum number of any element of the period

Atomic number of any element of the period

Maximum Principal quantum number of any element of the period

Maximum Azimuthal quantum number of any element of the period

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