Chemical properties of a metal. ..
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\tReaction with Air :\tMetals are converted into their oxides by the action of oxygen present in air.\t{tex}4Na + {O_2} \\to 2N{a_2}O{/tex} (sodium oxide)\tReaction with Hydrogen :\tActive metals like Na, K, Ca, Mg etc. react with hydrogen from their hydrides when heated at a temperature of 400°C and 200 atmospheric pressure.\t{tex}2Na + {H_2} \\to 2NaH{/tex} (sodium hydride)\tCa + H2{tex}\\rightarrow{/tex}\xa02CaO (calcium oxide)\tReaction with Water: Different metals react with water at different temperatures to evolve out hydrogen. Some metals react with water at room temperature and some metals which are less active react with hot water while other metals react only with steam.\tSodium, calcium react with water at room temperature. Sodium burns in water to give sodium hydroxide.\t\u200b\u200b\u200b\u200b\u200b\u200b{tex}2Na + 2{H_2}O \\to \\mathop {2NaOH}\\limits_{Sodium\\,\\,\\,hydroxide} + {H_2} \\downarrow {/tex}\tReaction with Acids :\tWith hydrochloric Acid: Metals like sodium, magnesium, zinc, iron, react with hydrochloric acid to form metal chloride hydrogen gas.\t{tex}\\begin{array}{c}{\\mathrm{zn}+2 \\mathrm{HCl} \\rightarrow \\quad \\mathrm{znCl}_{2}+\\mathrm{H}_{2} \\downarrow} \\\\ {\\text { Zinc chloride }}\\end{array}{/tex}\tReaction with Sulphur :\tSulphur reacts with metals and convert them into their sulphides.\tSodium is converted into white sodium sulphide.\t2Na + S {tex}\\rightarrow{/tex}\xa0Na2S (Sodium sulphide)