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Each comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option.
Comprehension 1 Alkali and alkaline earth
metals along with hydrogen and helium constitute s-block elements. They have low ionization enthalpies and hence exhibit characteristic flame colourations. They have highly negative electrode potentials and hence are strong reducing agents. Their solutions in liquid ammonia are conducting and also act as strong reducing agents. Being stronger reducing agents than hydrogen, they are usually prepared by electrolysis of their fused chlorides. Their oxides are basic and the basic strength increases down the group. The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends. The carbonates of alkaline earth metals and lithium carbonate decompose on metals do not decompose on heating. The metals do not decompose on heating. The metals on heating give carbonates.
The metal that produces red-violet colour in the non-luminous flame is
(A) \( \mathrm{Ba} \)
(B) \( \mathrm{Rb} \)
(C) Content not found
(D) \( \mathrm{K} \)
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