Chemical Reaction – MCQs 1. Heat is evolved during: (a) Combination Reaction (b) Combustion Reaction (c) Endothermic Reaction (d) Displacement Reaction 2. Dissolving sugar in water is an example of (a) Physical Change (b) Redox Reaction (c) Chemical change (d) None 3. Which among the following is not a physical change? (a) Melting of solids to liquids (b) Vaporisation of liquids to gases (c) Liquefaction of gases to liquids (d) Decay of matter 4. Chemical changes are __________. (a) temporary, reversible and a new substance is produced (b) always accompanied by exchange of light (c) permanent, irreversible and a new substance is produced (d) never accompanied by exchange of light and heat energy 5. Which of the following information is conveyed by a chemical reaction? (a) The colour changes taking place (b) The structure of the reactants and products (c) The absorption of energy only
Chem – X | 2011-12 (d) The masses of the reactants and products involved in the reaction 6. Chemically rust is (a) Hydrated ferric oxide (b) Hydrated ferrous oxide (c) only ferrous oxide (d) only ferric oxide 7. The formula for rust is________. (a) CuO (b) Fe2O3.xH2O (c) Al2O3 (d) AgS 8. The reaction H2 + Cl2 2HCl represents (a) Combustion (b) Combination (c) Reduction (d) Oxidation 9. Oxidation is a process which involves: (a) Addition of oxygen (b) Removal of hydrogen (c) Both (d) None 10. Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be: (a) green (b) red (c) blue (d) brown
Chemical Reaction – MCQs 11. When dilute hydrochloric acid is added to zinc pieces taken in a test tube: (a) no change takes place (b) the colour of the solution becomes yellow (c) a pungent smelling gas gets liberated (d) small bubbles of hydrogen gas appear on the surface of zinc pieces. 12. The main cause of rancidity in foods is (a) Bacteria (b) Proteins (c) Antioxidants (d) Oxidation of the fatty acid molecule 13. Which of these metals do not corrode? (a) Lead (b) Copper (c) Platinum (d) Silver 14. The products of a burning candle are: (a) ash and water vapour (b) CO2 and water vapour (c) wax and water vapour (d) only melted wax 15. CuSO4reacts with Zn to form a zinc sulphate and copper. In this reaction, copper act as a: (a) Oxidizing agent
Chem – X | 2011-12 (b) Reducing agent (c) Dehydrating agent (d) Bleaching agent 16. When KOH is treated with HCl, the reaction is called (a) Displacement reaction (b) Double displacement reaction (c) Combination reaction (d) Neutralization reaction 17. The arrangement of metal in the decreasing order of reactivity is (a) K>Cu>Ni>Pb (b) Pb>Ni>Cu>K (c) K>Ni>Pb>Cu (d) Ni>K>Cu>Pb 18.
is an example of ________. (a) neutralization reaction (b) redox reaction (c) double displacement reaction (d) decomposition reaction
In the reaction, the white precipitate seen is due to: (a) ZnCl2 (b) BaSO4 (c) BaCl2 (d) ZnSO4
20. Breaking of lead bromide into lead and bromine is an example of: (a) decomposition reaction (b) synthesis reaction (c) displacement reaction (d) neutralisation reaction 2|Page