An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell. (a) What type of bond will be formed between X and Y? (b) Write the formula of the compound formed.

(a) X has 7 electrons in its outermost shell and Y has only one electron in its outermost shell so Y loses its one electron and X gains that electron to form an ionic bond. (b) The formula of the compound would be XY.

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

Give one test to distinguish between the following pair of chemicals.
Sodium nitrate solution and sodium chloride solution.

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Explain why :
In the electrolysis of alumina using the Hall Heroults Process the electrolyte is covered with powdered coke.

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State your observation of the following case :
When dilute hydrochloric acid is added to sodium carbonate crystals.

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Give reason for the following:
$H_2SO_4$ cannot be prepared by heating sodium sulphate with conc. $HCl$ or $HNO_3$

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Describe all what you will observe and write chemical equation, when limited amount of ammonia gas is passed through the following aqueous solution:
$FeCl_3$

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Explain, why carbon tetra chloride does not dissolve in water?

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Distinguish by adding : sodium hydroxide solution and ammonium hydroxide solution to : Lead nitrate solution and zinc nitrate solution

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State the type of bonding present in ammonia, show by a diagram?

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A compound $X$ consists of $4.8 \%$ carbon and $95.2 \%$ bromine by mass.
If the vapour density of the compound is $252$, what is the molecular formula of the compound?

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Why is freshly prepared ferrous sulphate solution used in the ring test?

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