Which of the following statement is correct? D (a) A \( \sigma \)-b...

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Which of the following statement is correct?
D
(a) A \( \sigma \)-bond is weaker than a \( \pi \)-bond.
W
(b) There are four co-ordinate bonds in the \( \mathrm{NH}_{4}^{+} \)ion.
(c) The covalent bond is directional in nature.
(d) \( \mathrm{HF} \) is less polar than \( \mathrm{HCl} \).
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