General electronic configuration of outermost and penultimate shell of an atom is
(- 1)s2 (n - 1) p6 (- 1)dx ns2. If n = 4 and x = 5, the number of proton in the nucleus is:

1. > 25

2. < 24

3. 25

4. 30

Subtopic:  Electronic Configuration |
 64%
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The maximum number of valence electrons possible for atoms in the second period of the periodic table is:

1. 18

2. 10

3. 8

4. 2

Subtopic:  Electronic Configuration |
 72%
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The element having atomic number 19, is:

1. an inert gas

2. a metal with oxidation number +1

3. a non-metal with oxidation number -3

4. a metal with oxidation number -3

Subtopic:  Electronic Configuration |
 86%
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Which of the following has the least density?

1. Na

2. Li

3. Mg

4. K

Subtopic:  Modern Periodic Table & Periodicity |
 72%
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Eka aluminium and Eka silicon are now known as:

1. Ga and Ge 2. Al and Si
3. Fe and S 4. H+ and Si
Subtopic:  Modern Periodic Table & Periodicity |
 89%
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An element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:

1. Sodium

2. Carbon

3. Magnesium

4. Oxygen

Subtopic:  Electronic Configuration |
 75%
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The order of basic character of given oxides is:

1. Na2O > MgO > Al2O3 > CuO

2. MgO > Al2O3 > CuO > Na2O

3. Al2O3 > MgO > CuO > Na2O

4. CuO > Na2O > MgO > Al2O3

Subtopic:  Nature of Compound |
 67%
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Which of the following exhibits variable oxidation states?

1. Na 2. Cu
3. Mg 4. Al
Subtopic:  Modern Periodic Table & Periodicity |
 77%
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The lightest metal in the periodic table is:

1. H

2. Mg

3. Ca

4. Li

Subtopic:  Modern Periodic Table & Periodicity |
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The electronic configuration that represents the d-block element is: 

1. 1s2 2s2 2p6 3s23p63d10 4s24p6

2. 1s2 2s2 2p6 3s23p63d10 4s24p1

3. 1s2 2s2 2p6 3s23p63d10 4s2

4. 1s2 2s2 2p6 3s23p6 4s2

Subtopic:  Electronic Configuration |
 77%
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