Match the following elements, given as hints to their first, second ionization enthalpies and electron gain enthalpies. List- I List- II i ) Most reactive non-metal A ) ∆ H 1 = 419 , ∆ H 2 = 3051 , ∆ Eg H = - 48 ii ) Most reactive metal B ) ∆ H 1 = 1681 , ∆ H 2 = 3374 , ∆ Eg H = - 328 iii ) Least reactive element C ) ∆ H 1 = 738 , ∆ H 2 = 1451 , ∆ Eg H = - 40 iv ) Metal forming binary halide D ) ∆ H 1 = 3272 , ∆ H 2 = 5251 , ∆ Eg H = + 48

( i - B ) , ( i i - A ) , ( i i i - D ) , ( i v - C )

( i - A ) , ( i i - B ) , ( i i i - D ) , ( i v - C )

( i - B ) , ( i i - A ) , ( i i i - C ) , ( i v - D )

( i - B ) , ( i i - D ) , ( i i i - A ) , ( i v - C )

HARD

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Among the following statements, which statements are correct?

(i) Electron gain enthalpy values of elements may be exothermic (negative) or endothermic (positive).

(ii) Generally the radius trend and the ionization energy trend across a period are exact opposites.

(iii) The first ionization energy of sulphur is higher than that of phosphorus?

(iv) $T e^{2 -} > l^{-} > C s^{+} > B a^{2 +}$ represents the correct decreasing order of ionic radii.

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Important Questions on Classification of Elements and Periodicity in Properties

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The first ionization enthalpy of the following elements are in the order:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The element having the greatest difference between its first and second ionization energies, is

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The first ionization energy (in

k J / m o l

) of

N a, M g, A l

and

S i

respectively are:

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

Calculate the energy needed to convert three moles of sodium atoms in the gaseous state into sodium ions. The ionization energy of sodium is

495 kJ {mol}^{- 1}

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

Which element has the highest first ionization potential?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The process that is NOT endothermic in nature is :

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

For the second period elements the correct increasing order of first ionization enthalpy is:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

How does the ionisation energy of

1 st

group elements vary ?

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The electronic configuration with the highest ionization enthalpy is:

EASY

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

The electronic configuration of an element with the largest difference between the

1^{s t}

and

2^{n d}

ionization energies is

MEDIUM

Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Periodicity in Properties

Match the following elements, given as hints to their first, second ionization enthalpies and
electron gain enthalpies.

List- $I$	List- $II$
$i)$ Most reactive non-metal	$A)$ $∆ H_{1} = 419, ∆ H_{2} = 3051, ∆_{Eg} H = - 48$
$ii)$ Most reactive metal	$B)$ $∆ H_{1} = 1681, ∆ H_{2} = 3374, ∆_{Eg} H = - 328$
$iii)$ Least reactive element	$C)$ $∆ H_{1} = 738, ∆ H_{2} = 1451, ∆_{Eg} H = - 40$
$iv)$ Metal forming binary halide	$D)$ $∆ H_{1} = 3272, ∆ H_{2} = 5251, ∆_{Eg} H = + 48$