EASY
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Consider the following statements

I. The radius of an anion is larger than that of the parent atom.

II. The ionization energy generally increases with increasing atomic number in a period.

III. The electronegativity of elements increases on moving down across a group

Which of the above statements is - are correct?

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Important Questions on Classification of elements - The periodic table

MEDIUM
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
Which one of the following has largest ionic radius ?
EASY
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
Which element has the highest first ionization potential?
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3 . xH2O ?

Set I Al 2 O 3 · xH 2 O s + OH aq - Set II Al 2 O 3 x · H 2 O s + H 2 O l Set III Al 2 O 3 x · H 2 O s + H aq + Set IV Al 2 O 3 · xH 2 O s + NH 3 aq
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table

Give a reason for the following.

Ionisation potential increases across a period, from left to right.

EASY
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The correct order of atomic radii is:
HARD
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The option(s) with only amphoteric oxides is(are):
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The electronic configuration with the highest ionization enthalpy is:
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
In comparison to boron, beryllium has:
EASY
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
MEDIUM
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The element having the greatest difference between its first and second ionization energies, is
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
For the second period elements the correct increasing order of first ionization enthalpy is:
EASY
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
Which of the following atoms has the highest first ionization energy?
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The size of the iso-electronic species Cl- , Ar and Ca2+ is affected by:
HARD
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
B has a smaller first ionization enthalpy than Be. Consider the following statement:
(I) it is easier to remove 2p electron than2s  electron
(II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be
(III) 2s electron has more penetration power than 2p electron
(IV) atomic radius of B is more than Be
(atomic number B:5, Be=4 )
The correct statements are.
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
Which of the following orders of ionic radii is correctly represented?
EASY
Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The species Ar, K+ and Ca2+  contain the same number of electrons. In which order do their radii increase?
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
When the first electron gain enthalpy (ΔHeg) of oxygen is -141 kJ/mol , its second electron gain enthalpy is:
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Science>Chemistry>Classification of elements - The periodic table>Periodic properties of the elements in the modern table
The ionic radii (in  Å) of N3-, O2-  and  F-  are respectively: