According to Moseley, a straight-line graph is obtained on plotting:

1. The frequencies of characteristic X-rays of elements against their atomic numbers.

2. The square of the frequencies of characteristic X-rays of elements against their atomic numbers.

3. The square root of the frequencies of characteristic X-rays of elements against their atomic numbers.

4. The reciprocal of the frequencies of characteristic X-rays of elements against their atomic numbers.

Subtopic:   Evolution of Periodic Table |
 64%
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The tenth element in the periodic table resides in:

1. the second period

2. the fourth period

3. the fifth period

4. the eight period

Subtopic:  Modern Periodic Table & Periodicity |
 71%
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Which of the following order is not in accordance with the property stated against it?                                                                                                      

1. F2 > Cl> Br2 > l2 Oxidising Power

2. Hl > HBr >HCl >HF Acidic property in water

3. F2 > Cl> Br2 > lElectronegativity

4. F2 > Cl> Br2 > l2 Bond dissociation energy

Subtopic:  Modern Periodic Table & Periodicity |
 51%
From NCERT
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An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:

1. XO3, basic

2. XO3, acidic

3. X2O3, amphoteric

4. X2O3, basic

Subtopic:  Nature of Compound |
 60%
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The outermost electronic configuration of the most electronegative element is :

1. ns2np3

2. ns2np4

3. ns2np5

4. ns2np6

Subtopic:  Modern Periodic Table & Periodicity | Electronegativity |
 77%
From NCERT
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The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

1. X = 2, 8, 3

2. Y = 2, 8, 8

3. Z = 2, 8, 8, 1

4. j = 2, 8, 8, 7

Subtopic:  Atomic Size |
 76%
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Which statement is true?

1. The electronegative nature of elements increases along the period

2. The electropositive nature of elements increases along the period

3. The chemical reactivity of elements increases along the period

4. The I.E  of element decreases along the period

Subtopic:  Ionization Energy (IE) |
 79%
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The most non-metallic element among the following is:

1. Be

2. B

3. Mg

4. Al

Subtopic:  Modern Periodic Table & Periodicity |
 68%
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Element 58Ce belongs to:

1. s-block elements

2. p-block elements

3. d-block elements

4. f-block elements

Subtopic:  Electronic Configuration |
 65%
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The screening effect of 'd' electrons is:

1. Much less than s-electrons.

2. Much more than s-electrons.

3. Equal to s-electrons.

4. Equal to p-electrons.

Subtopic:  Screening Effect |
 79%
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