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11th CBSE

IMPORTANT

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In which case, effective nuclear charge is minimum?

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Important Questions on Classification of Elements and Periodicity in Properties

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 60

The effective nuclear charge of an element with three valence electrons is

2.60

. What is the atomic number of the element?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 61

Which of the following configuration represents atoms of the element having the highest second ionisation potential?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 62

Which electronic configuration of an element has abnormally high difference between second and third ionisation energy ?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 63

The five successive ionisation energies of an element are

800, 2427, 3658, 25024

and

32824 kJ {mol}^{- 1}

respectively. The number of valence electrons is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 64

For one of the elements various successive ionisation enthalpies (in $kJ {mol}^{- 1}$ ) are given below:

1st	2nd	3rd	4th	5th
$577.5$	$1810$	$2750$	$11, 580$	$14, 280$

The element is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 65

The following table shows the successive molar ionization energy ( $kJ {mol}^{- 1}$ ) of five elements A to E.

Element	Ionization energy $(kJ {mol}^{- 1})$
Element	1st	2nd	3rd	4th
A	2080	4000	6100	9400
B	500	4600	6900	9500
C	740	1500	7700	10500
D	580	1800	2700	11600
E	420	3100	4400	5900

Which of two elements are most likely to be in the same group of the periodic table?

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 66

One mole of magnesium in the vapour state absorbed

1200 kJ {mol}^{- 1}

of energy. If the first and second ionisation energies of

Mg

are

750

and

1450 kJ {mol}^{- 1}

respectively, the final composition of the mixture is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 67

Among

Be, B, Mg

and

Al

, the second ionisation potential is maximum for

In which case, effective nuclear charge is minimum?

Important Questions on Classification of Elements and Periodicity in Properties

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