1) Chemical Formula of Common Salt. a) NaCl b) KCl c) AgCl d) PbCl2 2) Reaction of 'Magnesium' with air is a) Endothermic b) Exothermic c) Reversible d) Displacement reaction 3) Why does colour of Copper sulphate changes when an iron nail is dipped in it. a) Reduction b) Corrosion c) Combination reaction d) Displacement reaction 4) When carbon dioxide is passed through lime water. a) Calcium hydroxide is formed b) Colour of lime water disappears c) Lime water turns milky d) White precipitate is formed 5) Oxidation includes gain of ____ and loss of ____ a) O2,N2 b) N2,O2 c) O2,H2 d) H2,N2 6) AgCl is stores in black box to protect it from corrosion a) True b) False 7) Sodium undergoes combustion when reacts with oxygen. a) True b) False 8) Chemical formula of marble is CaO a) True b) False 9) Iron can displace zinc from its compound. a) True b) False 10) Digestion is an endothermic reaction a) True b) False

Chemistry Quiz

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