Part A-Reactions of an Alkali Metal Consider the following three statements abou

Question

Part A-Reactions of an Alkali Metal Consider the following three statements about the reactivity of an alkali metal M with oxygen gas l. Based on their positions in the periodic table, the expected product is the ionic oxide M2O Il. Some of the alkali metals produce metal peroxides or metal superoxides when the react when dissolved in water, an alkali metal oxide produces a basic solution Which of the statements I, II, and IIl is or are true? O Only one of the statements is true O Statements l and il are true O Statements l and ill are true O Statements II and Ill are true O All three statements are true Submit Provide Feedback O Type here to search

Explanation / Answer

(I)Valence shell eclectronic configuration of alkali metal is ns1.So, valency of alkali metal is +1.While oxide (O2-) is divalent.So expected product is M2O.

(II) Na2O2 (metal peroxide),KO2(metal superoxide) are formed by alkali metals.[K +O2 =KO2]& [2Na + O2 = Na2O2 ]

(III)M2O + H2O = 2MOH (basic solution).

Therefore all the above statements are true.

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