s-Block ElementsHard
Question
Consider the following statements ;
S1 : Beryllium and Magnesium are inert to oxygen and water.
S2 : Concentrated solutions of alkaline earth metals in ammonia are bronze coloured.
S3 : Calcium, strontium and barium reacts with cold water forming hydroxides and liberating hydrogen gas.
S4 : Oxides and hydroxides of alkaline earth metals are more ionic and more basic than that of the alkali metals.
and arrange in the order of true/false.
S1 : Beryllium and Magnesium are inert to oxygen and water.
S2 : Concentrated solutions of alkaline earth metals in ammonia are bronze coloured.
S3 : Calcium, strontium and barium reacts with cold water forming hydroxides and liberating hydrogen gas.
S4 : Oxides and hydroxides of alkaline earth metals are more ionic and more basic than that of the alkali metals.
and arrange in the order of true/false.
Options
A.T T T T
B.T T T F
C.F T T F
D.F T F F
Solution
S1 : Because of the formation of an oxide film on their surface.
S2 : Due to the formation of metal ion clusters.
S3 : As the basicity (i.e. electropositive character) of alkaline earth metals increases, their reactivity towards water increases.
S4 : Oxides and hydroxides of alkaline earth metals are less ionic and basic. This is due to increased nuclear charge and smaller size.
S2 : Due to the formation of metal ion clusters.
S3 : As the basicity (i.e. electropositive character) of alkaline earth metals increases, their reactivity towards water increases.
S4 : Oxides and hydroxides of alkaline earth metals are less ionic and basic. This is due to increased nuclear charge and smaller size.
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