An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. Write the formula of the compound formed.

An atom X has 2, 8, 7 electrons in its shell. It combines with Y …

Give an example of a reaction where the following are involved
Heat

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Metal in the powdered form reacts very slowly with boiling water, but it decomposes in steam. Name the metal.

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Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.

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Identify the following reaction as either oxidation or reduction:
$O + 2e^- → O^{2-}$

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If electrons are getting added to en element Y; then
What charge will Y migrate to during the process of electrolysis?

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Name four elements of VIIA group. State the common name of this group of elements.

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Correct the following statement:
0°C is equal to zero Kelvin.

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Name a compound which produces carbon dioxide on heating.

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Balance the equations:
$\mathrm{Cu}\left(\mathrm{NO}_3\right)_2$ (s) $->\mathrm{CuO}(\mathrm{s})+\mathrm{NO}_2$ (s) $+\mathrm{O}_2$ (s)

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What is noticed if the products are not allowed to escape?

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