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(i) Arrange the following compounds acco...

(i) Arrange the following compounds according to their increase of melting point: `NaCl, MgCl_(2),AlCl_(3)`
(ii) Between `NH_(3) and NF_(3)` which one is more polar and why?

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(i) Increasing order of melting point:
`AlCl_(3) lt MgCl_(2) lt NaCl`
(ii) N/A
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