(c) (i) Give the formula of the stable oxides of the elements of Period 3 in the table below. Symbol of element Na Mg Al Si CI Ar Formula of oxide (ii) From the table above, select an amphoteric oxide and write balanced equations to show its reactions with hydrochloric acid and sodium hydroxide. Amphoteric oxide: Reaction with HC(aq): Reaction with N OH(aq): (ii) Write an equation for the reaction of the oxide of chlorine with water.

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A:

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A: HIn(aq) ⇌ H+(aq) + In-(aq)  Colourless                 Red colour

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A: Organic reaction mechanisms:

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A:

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.