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True or False
Elements are classified for their systematic study.

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Solution

The major credit for a systematic classification of elements goes to Mandeleev. He arranged known elements in order of their increasing atomic masses considering the fact that elements with similar properties should fall in the same vertical column.

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Q. True or False
Elements of the same group have same number of electrons for bonding.

For the purpose of systematic qualitative analysis, cations are classified into various groups on the basis of their behavior against some reagents. The group reagents used for the classification of most common cations are hydrochloric acid, hydrogen sulphide, ammonium hydroxide, and ammonium carbonate. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not.

An aqueous solution contains

H g^{2 +}

H g_{2}^{2 +}

P b^{2 +}

C d^{2 +}

. The addition of

2 M H C l

will precipitate :

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For the purpose of systematic qualitative analysis, cations are classified into various groups on the basis of their behaviour against some reagents. The group reagents used for the classification of most common cations are hydrochloric acid. hydrogen sulphide, ammonium hydroxide, and ammonium carbonate.
Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not.

Which one among the following pairs of ions can be separated by

H_{2} S

in presence of dilute hydrochloric acid?

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