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Coordinate covalent Bond

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Question#1
Among the following molecule , which one has coordinate covalent bond ? SET2019
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Question#2

Which of the following contains a coordinate covalent bond [MNR 1990; IIT 1986]

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Question#3

In the coordinate valency [CPMT 1989]

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Question#4

Coordinate covalent compounds are formed by [CPMT 1990, 94]

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Question#5

Which of the following does not have a coordinate bond  [MADT Bihar 1984]

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