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Chemical Bonding and Molecular Structure

Long Answer Type

251.

Why does ice float over water?

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252.

Give reasons for the following:
(i) Density of water is maximum at 277K (4°C).
(ii) Why glycerol (glycerine) is more viscous than ethyl alcohol?

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Short Answer Type

253.

Explain the formation of a chemical bond.

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Long Answer Type

254.

Write Lewis symbols for the following atoms and ions:
S and S^2–; Al and Al³⁺; H and H^–.

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Short Answer Type

255.

Define octet rule. Write its significance and limitations.

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256.

Write three favourable factors for formation of ionic bond.

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257.

Define bond length.

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Long Answer Type

258.

Explain the important aspects of resonance with reference to the $CO subscript 3 superscript 2 minus end superscript space ion. space$

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259.

Define electronegativity. How does it differ from electron gain enthalpy?

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260.
Explain with the help of suitable example polar covalent bond.

If two different atoms are linked to each other by a covalent bond,then the shared electron pair will not lie in the centre because the bonding atoms differ in electronegativities.Such a bond is called as polar covalent bond.For in NaCl , chlorine is more electronegative than sodium. Hence it will have more control over the shared pair of electrons & will develop a partial negative charge & sodium will acquire partial positive charge & a polar covalent bond is formed. Greater the difference in electronegativity of bonding atoms more will be the polarity of the bond.

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