s-Block ElementsHard
Question
Consider the following statements ;
S1 : Alkali metals are never found in free state in nature.
S2 : The melting and boiling points of alkali metals are high.
S3 : The ceasium and potassium both are used as electrodes in photoelectric cells.
S4 : Alkali metals are normally kept in kerosene oil.
and arrange in the order of true/false.
S1 : Alkali metals are never found in free state in nature.
S2 : The melting and boiling points of alkali metals are high.
S3 : The ceasium and potassium both are used as electrodes in photoelectric cells.
S4 : Alkali metals are normally kept in kerosene oil.
and arrange in the order of true/false.
Options
A.T T F F
B.T F T T
C.F F F T
D.T T F T
Solution
S1 : As they readily lose electron to give monovalent M+ ions because of low ionisation energies..
S2 : Have low melting and boiling points,as they have weak metallic bonds due to the presence of only a single valence electron/atom.
S3 : Because of low ionisation energies, these elements when irradiated with light, the light energy absorbed is sufficient to make an atom lose electron.
S4 : Because of their high reactivity towards air and water.
S2 : Have low melting and boiling points,as they have weak metallic bonds due to the presence of only a single valence electron/atom.
S3 : Because of low ionisation energies, these elements when irradiated with light, the light energy absorbed is sufficient to make an atom lose electron.
S4 : Because of their high reactivity towards air and water.
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