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Ans.4 When a metal react with water,then a metal hydroxide and hydrogen gas is formed. The intensity of reaction of a metal with water depends on its chemical reactivity. Some metals react vigorously even with cold water,some react with hot water,some metals react with steam whereas some metals do not react even with steam.
Ans.5 Plastics are non-biodegradable materials. So use of plastics is harmful for our environment. The plastics cannot be finally disposed off. Thus, plastics should be avoided as far as possible.
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