| 1. | What is obtained on adding lime to H2O ? | |
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lime
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limestone
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slaked lime
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quicklime
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Report Question| 2. | Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam ? | |
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Fe3O4
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FeO
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Fe2O3
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Fe2O3 and Fe2O4
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| 3. | The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X ? | |
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Kr
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He
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Ar
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Ne
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| 4. | The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ? | |
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Smelting
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Calcination
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Reduction
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Roasting
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| 5. | Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z ? | |
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Occurs as solid
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Has low melting point
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Has high melting point
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Conducts electricity in molten state
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| 6. | Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin ? | |
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Conductivity
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Ductility
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Malleability
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Sonorousness
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| 7. | Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using ? | |
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Calcium as reducing agent
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Carbon as reducing agent
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Sodium as reducing agent
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Aluminium as reducing agent
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