Some P Block Elements

Chemistry
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The tendency to show inert pair effect follows the order :

A
B
C
D
Hard
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Which of the following is incorrect regarding the structural features of borax?

A
It has two tetrahedral and two triangular units
B
All the boron atoms are not in same hybrid state
C
Each boron atom of a pair is tetravalent
D
Only one boron atom has a lone pair of electrons
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Which of the following statement is/are correct?

A
is not an electron-deficient compound
B
Boron has an extremely high melting point because of the strong binding forces in the covalent polymer
C
and molecules have different shapes
D
Ortho boric acid contains pyramidal units
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Order of stability of the ions of Ge, Sn and Pb is:

A
B
C
D
Hard
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Which one of the following statements is incorrect about the structural properties of ?

A
The unsual shortness of bonds is due to interaction between and atoms
B
All the three bond lengths are equal
C
Double bond is delocalized giving three resonance structures.
D
Due to back bonding, and are not isostructural molecules
Hard
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