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IMPORTANT
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The set representing the correct order of first ionization potential is

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Important Questions on Classification of Elements and Periodicity in Properties

EASY
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IMPORTANT
Identify the least stable ion amongst the following:
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IMPORTANT
Which one of the following ions has the highest value of ionic radius?
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IMPORTANT

The formation of the oxide ion O2- g requires first, an exothermic and then an endothermic step as shown below:

O g+e-O- g; ΔH=-142 kJmol,

O- g+eO2- g; ΔH=844 kJmol.

This is because:

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IMPORTANT
In which of the following arrangements, the order is not according to the property indicated against it?
EASY
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IMPORTANT
The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is:
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IMPORTANT
The correct sequence which shows decreasing order of the ionic radii of the element is
MEDIUM
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IMPORTANT
The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9,17,35 and 53 respectively, is
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IMPORTANT
The increasing order of the ionic radii of the given isoelectronic species is