EASY
JEE Main
IMPORTANT
Earn 100
The characteristics of elements and with atomic numbers, respectively, and are:
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Important Questions on Classification of Elements and Periodicity in Properties
HARD
JEE Main
IMPORTANT
has a smaller first ionization enthalpy than . Consider the following statement:
(I) it is easier to remove electron than electron
(II) electron of is more shielded from the nucleus by the inner core of electrons than the electrons of
(III) electron has more penetration power than electron
(IV) atomic radius of is more than
(atomic number )
The correct statements are.
MEDIUM
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IMPORTANT
The acidic, basic and amphoteric oxides, respectively, are
MEDIUM
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IMPORTANT
The electronic configurations of bivalent europium and trivalent cerium are:
(atomic number: , ,
EASY
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IMPORTANT
When the first electron gain enthalpy of oxygen is , its second electron gain enthalpy is:
EASY
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IMPORTANT
In general, the properties that decrease and increase down a group in the periodic table, respectively, are :
MEDIUM
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IMPORTANT
The element having the greatest difference between its first and second ionization energies, is
EASY
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IMPORTANT
The electronic configuration with the highest ionization enthalpy is:
MEDIUM
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IMPORTANT
In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3 . xH2O ?
