Arrange the following elements in increasing order of first ionization enthalpy: $$\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}$$

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Arrange the following elements in increasing order of electronegativity:

N, O, F, C, Si

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Which of the following is correctly matched?

The correct sequence given below containing neutral, acidic, basic and amphoteric oxide each, respectively, is