Which of the following statements about the elements, $M g, C a, S r$ and $B a$ their compounds are incorrect?

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All given elements react with water or steam to give hydrogen.

All given elements impart characteristic colours to flame.

Solubility of the hydroxides in water decreases with increasing Atomic Number.

Thermal stability of the carbonates decreases with increasing atomic number.

answer is B, C, D.

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Detailed Solution

Alkaline earth metals react with water to form corresponding hydroxide with the evolution of hydrogen gas. Reactivity of alkaline earth metals with water increases from Mg to Ba. Be does not react even with boiling water,Mg reacts with boiling water while Ca,Sr,Ba react vigorously even with cold water.

But all metals react with steam and liberate hydrogen gas

Be and Mg do not impart flame colour

solubility of hydroxides increases down the group

thermal stability of carbonates increases down the group

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