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In the structure of ClF3, the number of lone pairs of electrons on central atom 'Cl' is:
1. 1
2. 2
3. 3
4. 4

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The number of lone pairs xenon has in XeF2, XeF4, and XeF6 is, respectively:
1. 3, 2, 1
2. 2, 4, 6
3. 1, 2, 3
4. 6, 4, 2