| 1. | Which of the following does not involve a chemical reaction ? | |
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Melting of candle wax on heating
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Burning of candle wax when heated
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Digestion of food in our body
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Process of respiration
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Report Question| 2. | Dissolving sugar is an example of ? | |
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Redox Reaction
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Chemical change
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Physical change
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None of these
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| 3. | Which of the following is a thermal decomposition reaction ? | |
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ZnCO3 -> ZnO + CO2
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H2(g) + Cl2(g) -> 2HCl(g)
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2AgCl -> 2Ag + Cl2
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2H2O -> 2H2 + O2
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| 4. | What is observed when a solution of potassium iodide is added to silver nitrate solution ? | |
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White precipitate of silver iodide is formed
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Agl is soluble in water
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No reaction takes place
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yellow precipitate of Agl is formed
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| 5. | A substance added to food containing fats and oils is called ? | |
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Coolant
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Antioxidant
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Rancid
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Oxidant
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| 6. | The process of reduction involves ? | |
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addition of hydrogen
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removal of hydrogen
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addition of oxygen
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removal of oxygen
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| 7. | The following reaction is an example of a 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction ? | |
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(iii) and (iv)
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(ii) and (iii)
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(i) and (iv)
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(i) and (iii)
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| 8. | Which of the following is (are) an endothermic process(es) (z) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water ? | |
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(iii) only
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(ii) and (iv)
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(ii) only
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(i) and (iii)
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| 9. | Bhanu Appeared In Class Test Where He Wrote Some Statements But He Confused To Know The Correct Statement. Would You Help Him To Know That ? | |
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The orange colour of potassium dichromate solution changes to green when sulphur dioxide gas is passed through acidified potassium dichromate solution.
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Some chemical reaction and are characterized by a change in colour.
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The purple colour of potassium permanganate solution disappears when citric acid reacts with potassium permanganate solution.
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All the above.
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| 10. | The Following Reaction Is An Example Of A: 4NH3 (G) +5O2 (G) -> 4NO (G) + 6H2O (G) ? | |
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Redox reaction, neutralisation reaction
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Displacement reaction, redox reaction
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Displacement reaction, neutralisation reaction
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Combination reaction, redox reaction
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