1) When an iron nail is added to a solution of copper sulphate, we observe ____________________ a) effervescence b) change in colour c) precipitate formation d) test tube becomes warm 2) When an iron nail is placed in a test tube containing ________________________ it does not rust. a) freshly boiled cooled water b) sea water c) distilled water d) tap water 3) Which among the following is not observed when magnesium ribbon is burnt? a) white dazzling flame b) formation of ash c) formation of white residue d) liberation of heat 4) During a chemical reaction, Rahul observed that the gas evolved turned lime water milky. Identify the reaction a) metal and acid b) baking soda and vinegar c) carbondioxide and water d) glucose and water 5) Which among the following is not an endothermic reaction? a) melting of ice b) freezing of water c) evaporation of water d) sublimation of dry ice 6) Which is not an evidence that a chemical change has taken place? a) change in state of matter b) production of heat/light c) production of gas d) formation of a solid 7) When two clear liquids are mixed and a solid forms, which evidence of chemical reaction is this? a) colour change b) drop in temperature c) formation of a residue d) formation of a precipitate 8) Which is not a physical change? a) desalination of sea water b) sublimation of camphor c) drying of clothes d) making curd 9) Which is not a chemical change? a) breathing b) respiration c) digestion d) combustion 10) the process that involves mixing of iron with other metals or non metals to prevent corrosion is called_________________ a) electroplating b) alloying c) galvanisation d) amalgamation

Physical and Chemical changes Revision

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