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What happens when (a) magensium in burnt...

What happens when (a) magensium in burnt in air, (b) quicklime is heated with silica, (c ) chlorine reacts with slaked lime and (d) calcium nitrate is heated?

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(i) A mixtrue of magnesium oxide and magnesium nitride is formed
`5Mg+ubrace(O_(2)+N_(2))_("In air ")overset("Heat")tounderset("Mag.oxide")(2Mg)O+underset("Mag.nitride")(Mg_(3)N_(2)`
(ii) Calcium silicate is formed `CaO+ SiO_(2)tounderset("Cal. silicate")(CaSiO_(3))`
(iii)Calcium oxychlride (bleaching powder) is formed
`Ca(OH)_(2)+CI_(2)tounderset("Bleaching Powder")(CaOCI_(2))+ H_(2)O`
(iv) Nitrogen dioxide is evolved
`2Ca(NO_(3))_(2)overset("Heat")to2CaO+4NO_(2)+O_(2)`
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