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7.35     Which of the followings are Lewis acids?  H_{2}O, BF_{3},H^{+} and NH_{4}^{+}

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Lewis acid-
Those species which can accept the pair of electrons are called Lewis acids. For example  Boron trifluoride (BF_3), ammonium ion(NH_4^+) and the hydrogen ion(H^+). Among them water molecule is a Lewis base, it can donate pair of electrons.

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