The ions O2-, F-, Na+, Mg2+, and Al3+ are isoelectronic. Their ionic radii show [2003]

1. an increase from O2- to F- and then decrease from Na+ to Al3+

2. a decrease from O2- to F- and then increase from Na+ to Al3+

3. a significant increase from O2- to Al3+

4. a significant decrease from O2- to Al3+

Subtopic:  Electronic Configuration |
 70%
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An example of metalloid elements in the periodic table is:

1. Na and K 2. Cu and Al
3. As and Si 4. Ca and Mg
Subtopic:  Modern Periodic Table & Periodicity |
 88%
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The element with atomic number 26 is:

1. A non-metal

2. Krypton

3. Iron

4. Manganese

 

Subtopic:  Modern Periodic Table & Periodicity |
 88%
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The alkali metals have:

1. highest ionization energy

2. largest atomic radii

3. highest density

4. highest electronegativity

Subtopic:  Modern Periodic Table & Periodicity |
 73%
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The telluric helix was given by:

1. Newland

2. Mendeleev

3. Lothar Meyer

4. De-chancourtois

Subtopic:   Evolution of Periodic Table |
 64%
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The element with atomic number 30 is expected to be present in:

1. IB group

2. IA group

3. IIA group

4. IIB group 

Subtopic:  Electronic Configuration |
 75%
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The correct order of acid strength is:

1. Cl2O7>SO2>P4O10

2. CO2>N2O5>SO3

3. Na2O>MgO>Al2O3

4. K2O>CaO>MgO

Subtopic:  Nature of Compound |
 79%
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Which among the following elements is the bridge element?

1. K

2. O

3. Mg

4. Pb

Subtopic:  Modern Periodic Table & Periodicity |
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Four successive members of the first-row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

1. Vanadium (Z = 23)

2. Chromium (Z = 24)

3. Iron (Z = 26)

4. Manganese (Z = 25)

Subtopic:  Ionization Energy (IE) |
 55%
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Transition elements show:

1. variable valency

2. paramagnetism

3. catalytic properties

4. all of these

Subtopic:  Modern Periodic Table & Periodicity |
 93%
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