| 1. | When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because ? | |
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it loses water of crystallisation
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it forms SO3
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it is decomposed to ferric oxide
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it forms SO2
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Report Question| 2. | Oxidation is a process which involves ? | |
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removal of hydrogen
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removal of oxygen
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addition of oxygen
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addition of hydrogen
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| 3. | 2HNO3 + Ca(OH)2 -> Ca(NO3)2 + 2H2O; is an example of (i) displacement reaction (ii) double displacement reaction (iii) neutralisation reaction (iv) combination reaction ? | |
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(i) and (iv)
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(iii) and (iv)
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(i) and (ii)
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(ii) and (iii)
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| 4. | The formula of Ammonium phosphate is ? | |
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(NH4)3(PO4)2
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(NH4)2PO4
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(NH4)3PO4
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NH4PO4
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| 5. | Which of The following statement is or Are Incorrect ? | |
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The chemical reaction between sodium carbonate and dilute hydrochloric acid is characterized by the evolution of carbon dioxide gas.
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The burning of magnesium in air to form magnesium oxide.
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The properties of the product magnesium oxide are entirely different from the reactants.
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None of the above
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| 6. | Which of The following statement is or Are Incorrect ? | |
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The chemical reaction between sodium carbonate and dilute hydrochloric acid is characterized by the evolution of carbon dioxide gas.
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The burning of magnesium in air to form magnesium oxide.
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The properties of the product magnesium oxide are entirely different from the reactants.
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None of the above
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| 7. | The blue flame in the below image represents the burning of which metal ? | |
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Copper
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Sodium
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Iron
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All metal burn to give a blue flame
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| 8. | When dilute HCl is added to zinc pieces taken in a test tube ? | |
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A pungent smelling gas gets liberated.
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the colour of the solution becomes yellow.
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small bubbles of H2 gas appear on the surface of zinc pieces
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No change takes place
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| 9. | The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called ? | |
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corrosion
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rancidity
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reduction
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antioxidation
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| 10. | A reaction of hydrogen with oxygen to form water is a ? | |
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Reaction not feasible
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Endothermic reaction
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Decomposition reaction
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Exothermic reaction
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