NTA Abhyas JEE Main2020Chemistrys Block ElementsPractice

When potassium is reacted with oxygen, which of the following compound(s) is/are formed?

Options

AK 2 O
BKO 2
CBoth K 2 O and KO 2
DK 2 O 2

Correct answer

B. KO 2

Step-by-step solution

Various alkali metals react with oxygen to give different types of compounds. Lithium reacts with oxygen to form simple oxides (Li 2 O), Sodium reacts to form peroxides (Na 2 O 2 ) while potassium, rubidium and caesium form superoxides (MO 2 ). Hence, correct answer will be KO 2 .

Practice s Block Elements on Quantrex Academy →

More from s Block Elements

First and second ionization enthalpies of lithium are 520 kJ mol ⁻¹ and 7297 kJ mol ⁻¹ respectively. Energy required to convert 3.5 mg lithium (g) into Li ²⁺ (g) [ Li(g) Li ²⁺ (g) 2026 The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is: 2026 Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R : Assertion (A) : BeCl 2 and MgCl 2 produce characteristic flame Reason (R) : T 2023 Be ( OH ) 2 reacts with Sr ( OH ) 2 to yield an ionic salt. Choose the incorrect option related to this reaction from the following 2023 In the given reaction cycle X , Y and Z respectively are 2023 The density of alkali metals is in the order 2023 Alkali metal from the following with least melting point is 2023 Mg NO 3 2 . XH 2 O and Ba NO 3 2 . YH 2 O , represent formula of the crystalline forms of nitrate salts. Sum of X and Y is....... 2023 Full s Block Elements list All NTA Abhyas JEE Main PYQs