Question

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Answer 1

Answer:

1. (b) remove the layer of magnesium oxide from the ribbon surface.

2. (d) hydrogen

3. (a) exothermic process

4. (a) formation of new substances having entirely different properties than that of the reactants.

5.(d) conservation of mass.

6. quick lime = CaO

slaked lime = Ca(OH)2

limestone= CaCO3

b) A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.

7. In whitewash Calcium hydroxide is present. Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.

Explanation:

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Answer 2

Answer:

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