1) When copper hydroxide is heated , we obtain ............... a) copper carbonate and water b) copper oxide and hydrogen c) copper oxide and water vapour d) copper and hydrogen 2) the substance which can be used as a catalyst is ................... a) copper carbonate b) Cu(OH)2 c) magnesium hydroxide d) manganese dioxide 3) The gas which evolves on adding diluted hydrochloric acid to iron filings is a) Cl2 b) H2 c) O2 d) CO2 4) Some reaction need several months to occur such as ................ a) fireworks b) rusting of iron c) formation of soap d) formation of petroleum oil 5) during chemical reaction concentration of resultants.................. a) become zero b) become 100% c) decrease gradually d) increase gradually 6) On heating red mercuric oxide it decomposes into ............... a) oxygen b) mercury c) mercury and oxygen d) no correct answer 7) The reaction of oil with caustic soda is one of the ..............reactions a) very fast b) relatively slow c) very slow d) too slow 8) By adding silver nitrate to sodium chloride solution ......... precipitate is formed a) black b) white c) blue d) brown 9) The chemical reaction of ionic compound are ................ a) slow b) fast c) between molecules d) a & c

Unit 1 Quiz1.Science

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