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Class 7 Science
Physical And Chemical Changes
Quiz 7
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which of the following reaction is incorrect
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Carbon dioxide (CO2) + Lime water[Ca(OH)2] -> Calcium Carbonate (CaCO3) + Water (H2O]
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Vinegar (Acetic acid) + Baking soda(Sodium hydrogen carbonate) -> Carbon dioxide + other substances
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Iron[Fe] + Oxygen [O2 ] + water (H2O) -> rust (iron oxide Fe3O4)
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Magnesium oxide (MgO) + Water (H2O) ->Magnesium hydroxide [Mg(OH)2]
A man painted his main gate made up of iron, to (i) prevent it from rusting. (ii) protect it from sun. (iii). make it dust free (iv). make it look beautiful Which of the above statement(s) is/are correct?
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(i) and (ii)
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(i) and (iv)
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only (ii)
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i) and (iii)
What is the formula of rust?
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Fe
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None of these
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FeO
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(i) and (ii)
Explanation
Fe
0 h : 0 m : 1 s
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