The electronic configuration of four elements are :
(I) [Kr]5s1
(II) [Rn]5f146d17s2
(III) [Ar]3d104s24p5
(IV) [Ar]3d64s2

Consider the following statements :
(i) I Shows variable oxidation state
(ii) II is a d-block element
(iii) The compound formed between I and III is covalent
(iv) IV shows single oxidation state

Which statement is True (T) or False (F)?
1. FTFF
2. FTFT
3. FFTF
4. FFFF

Subtopic:  Nature of Compound | Electronic Configuration |
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Match the element in column I with that in column II.

    Column-I    Column-II

(a) Copper     (i) Non-metal

(b) Fluorine   (ii) Transition metal

(c) Silicon     (iii) Lanthanoid

(d) Cerium    (iv) Metalloid

Identify the correct match:

1. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

2. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

3. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

4. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

Subtopic:  Modern Periodic Table & Periodicity |
 92%
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Match the correct atomic radius with the corresponding element.

Element

Atomic radius (pm)

A. Be

i. 74

B. C

ii. 85

C. O

iii. 112

D. B

iv. 77

E. N

v. 66

Codes

Options:  A   B   C   D   E 
1.   i  ii  iii  iv  v
2.  iii   iv  v   ii  i
3.  iv  ii  iii   i  v
4.  v  ii    i   iii   iv

Subtopic:  Atomic Size |
 80%
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Match the correct ionization enthalpies and electron gain enthalpies of the following elements.

Elements

H1

H2

egH

(i)

Most reactive non-metal

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

Codes

A B C D
1. ii i iv iii
2. i ii iii iv
3. i iv iii ii
4. iv i iii ii
Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 66%
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Electronic configuration of some elements is given in Column I and their electron gain enthalpies are given in Column II. Match the electronic configuration with electron gain enthalpy.

Column I

(Electron configuration)

Column II

(Electron gain enthalpy/kJ mol-1)

A. 1s22s22p6

1. -53

B. 1s22s22p63s1

2. -328

C. 1s22s22p5

3. -141

D. 1s22s22p4

4. +48

Codes

Options:  A   B   C   D 
1.  4 1 2 3
2. 1 2 3 5
3. 1 4 3 2
4. 4 1 3 2

Subtopic:  Electron Affinity (EA) |
 75%
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Given below are two statements: 

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.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 74%
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Given below are two statements: 

Assertion (A): Boron has a smaller first ionisation enthalpy than beryllium.
Reason (R): The penetration of 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Ionization Energy (IE) |
 76%
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Given below are two statements: 

Assertion (A): Electron gain enthalpy becomes less negative as we go down a group.
Reason (R): The size of the atom increases on going down the group and the added electron would be farther from the nucleus.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Electron Affinity (EA) |
 84%
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Match the element in column I with that in column II.

Column-I Column-II
(a) Copper (i) Non-metal
(b) Fluorine (ii) Transition metal
(c) Silicon (iii) Lanthanoid
(d) Cerium (iv) Metalloid
 
(a) (b) (c) (d)
1. (ii) (iv) (i) (iii)
2. (ii) (i) (iv) (iii)
3. (iv) (iii) (i) (ii)
4. (i) (ii) (iii) (iv)
Subtopic:  Electronic Configuration |
 86%
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Correct statement(s) among the following are-

a. Helium has the highest first ionisation enthalpy in the periodic table
b. Chlorine has less negative electron gain enthalpy than fluorine
c. Mercury and bromine are liquids at room temperature
d. In any period, the atomic radius of alkali metal is the highest

Choose the correct option

1. (a), (c), (d)

2. (a), (b), (c)

3. (a), (c),

4. (a), (d)

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 68%
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