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Which of the following has variable valency?

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Important Questions on The Periodic Table

HARD
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
The lattice energies of NaCl, NaF, KCl and RbCl follow the order
MEDIUM
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Maximum bond angle at nitrogen is present in which of the following?
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Among the following molecules, the one with the largest bond angle at the central atom is
EASY
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
What do you understand by a lone pair of electrons?
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Which substance from the following is not obtained during destructive distillation of mineral coal?
EASY
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Total number of lone pair of electrons in I3- ion is:
EASY
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
The numbers of lone pair and bond pairs in hydrazine are, respectively:
MEDIUM
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
The compound having longest C-Cl bond is:
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Write with an example, how according to Lewis concept, a covalent bond is formed.
HARD
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Ethane with the molecular formula C2H6 has
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Give a reason for the following:

Ionic compounds have a high melting point.

HARD
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Draw the electron dot diagram for the compound given below. Represent the electrons by (.) and (x) in the diagram.

  • Water molecule [Atomic No. of H=1, O=8]
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
In ozone molecule, the formal charge on the central oxygen atom is
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Which of the following compounds contain(s) no covalent bond(s)?

KCl, PH3, O2, B2H6, H2SO4
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Arrange the following compounds in increasing order of C-OH bond length: methanol, phenol, p -ethoxyphenol
EASY
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
Which of the following pair contains 2 lone pair of electrons on the central atom?
EASY
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
The number of π -bonds and σ -bonds present in naphthalene are respectively
MEDIUM
Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
The compound(s) with two lone pairs of electrons on the central atom is (are)
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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements

Draw the electron dot diagram of Hydronium ion. H=1; O=8

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Chemistry>Inorganic Chemistry>The Periodic Table>Transition Elements
What are covalent compounds? Write any three features and give two examples.