| 1. | Puneet Is writing some statements, choose the correct statement and help him ? | |
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A chemical equation is a shorthand method of representing a chemical reaction.
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The new substances produced in a reaction are known as products.
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The substance which combine or react are known as reactants.
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All the above.
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Report Question| 2. | Which of the following gases can be used for storage of fresh sample of an oil for a long time ? | |
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Carbon dioxide or helium
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Helium or nitrogen
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Nitrogen or oxygen
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Carbon dioxide or oxygen
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| 3. | In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ? | |
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2H2 (g) + O2 (g) > 2H2O (l)
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2H2 (g) + O2 (l) > 2H2O (l)
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2H2 (g) +O2 (g) > 2H2O (g)
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2H2 (l) + O2 (l) > 2H2O(g)
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| 4. | Which of the following reactions will not take place ? | |
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Zn + MgSO4 -> ZnSO4 + Mg
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Mg + FeSO4 -> MgSO4 + Fe
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2KBr + Cl2 -> KCl + Br2
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Zn + CuSO4 -> ZnSO3 + Cu
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| 5. | Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is ? | |
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1 : 2
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4 : 1
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1 : 1
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2 : 1
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| 6. | MnO2 + 4HCl -> 2 + 2H2O + Cl2 Identify the substance oxidized in the equation ? | |
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MnO2
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MnCl2
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HCl
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H2O
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| 7. | Magnesium ribbon is rubbed before burning because it has a coating of ? | |
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basic magnesium chloride
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basic magnesium sulphide
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basic magnesium carbonate
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basic magnesium oxide
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| 8. | Which of the following gases can be used for storage ? | |
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Helium or Nitrogen
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Carbon dioxide or Helium
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Carbon dioxide or Oxygen
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Nitrogen or Oxygen
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| 9. | Which of the following gases can be used for storage ? | |
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Helium or Nitrogen
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Carbon dioxide or Helium
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Carbon dioxide or Oxygen
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Nitrogen or Oxygen
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| 10. | Which Among The Following (Are) Double Displacement Reaction (S) ? | |
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C + O2 -> CO2, and CH4 + 2O2 -> CO2 + 2H2O
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Pb + CuCl2 -> PbCl2 + Cu, and Na2SO4 + BaCl2 -> BaSO4 + 2NaCl
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Na2SO4 + BaCl2 -> BaSO4 + 2NaCl
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Pb + CuCl2 -> PbCl2 + Cu, and CH4 + 2O2 -> CO2 + 2H2O
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