Short Answer TypeWhat causes the two atoms to combine to form a bond which is:
(i) Non-polar
(ii) Polar-covalent and
(iii) Ionic in nature?
The nature of the bond between the two atoms depends on upon the electronegativity difference in them.
(i) If the two atoms are identical or have the same electronegativity (C and S), the bond is of non-polar nature.
(ii) If the two atoms differ in electronegativity, but the difference is less than 1 -9, the bond is mainly polar covalent with little ionic character. For example, the bond between carbon and chlorine.
(iii) If the difference in electronegativity of two atoms is more than 1 -9, the percentage ionic character is more than the percentage polar covalent character. Larger the electronegativity difference, greater will be the ionic character. For example, the bond between sodium and fluorine is completely ionic.
Long Answer TypeBriefly explain the term 'Dipole moment'. How is it expressed and what are its units?
Although both CO2 and H2O are triatomic molecules, the shape of H2O molecule is bent While that of CO2 is linear. Explain this on the basis of dipole moment.
Short Answer TypeExplain why BeH2 molecule has a zero dipole moment although the Be-H bonds are polar?
Long Answer TypeSketch the bond moments and resultant dipole moment in SO2, cis and trans forms of CH2Cl2.
Short Answer Type
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