The first ionisation enthalpies of Na, Mg, Al, and Si are in the order of-

1. Na < Al < Mg < Si

2. Na > Mg > Al > Si

3. Na < Mg < Al < Si

4. Na > Mg > Al < Si

Subtopic:  Ionization Energy (IE) |
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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) |
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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) |
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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) |
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Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is

1. [Ne]3s23p1

2. [Ne]3s23p3

3. [Ne]3s23p2

4. [Ar]3d104s24p3

Subtopic:  Ionization Energy (IE) |
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Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:

1. [Ne]3s23p1

2. [Ne]3s23p3

3.  [Ne]3s23p2

4.  [Ar]3d104s24p3

Subtopic:  Ionization Energy (IE) |
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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) |
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In which following options of arrangement does not agree with the variation of the property indicated against it?

(a) Al3+<Mg2+<Na+<F- (Increasing ionic size)

(b) B<C<N   (Increasing atomic size)

(c) I<Br<Cl (Increasing atomic size)

(d) Li<Na<K (Metallic character)

Choose the correct option

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Ionization Energy (IE) | Atomic Size |
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