Choose from following ways to prevent the rusting of iron:

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(d) All (a), (b) and (c) Fill in the blanks: Metal generally give ……………Oxides when dissolved in water. Li, Na and K are …………… metals. K and Na catch fire when exposed to ………. Ag and Au ………….. react with water at all. Aluminium is positioned ……………. hydrogen in reactivity series. …………………….. is called royal water. Metal is displaced from their ……………… or …………….. form. Metal gives salt when it reacts with……. Hydrogen is not liberated when metal reacts with ……….. acid. Ionic compounds are ……………………….. in water. Ionic compounds are hard but …………….. in nature hence break into pieces when pressure is applied. Earth’s …………….. is main source of metal. Minerals containing metals are called ………………. Sulphide ores contain metals with ………………. reactivity. Carbonate ore is converted to their metal oxides by the process of ………… Electrolysis is done to the ores of ……………….. reactivity to obtain pure metal. Impurities such as soil, sand etc. are called …………… in the ore. Bronze is a homogeneous mixture of ……………… and ……………. Answers: basic soft air do not above Aqua regia solution, molten alkali nitric acid soluble brittle crust Ores low Calcination high gangue copper, tin MP Board Class 10th Science Chapter 3 Very Short Answer Type Questions

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