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Which of the following is not a peroxide?
(a) KO2(b) CrO5(c) Na2O2 (d) BaO2

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Correct answer is option (c). Because A peroxide is a compound containing oxygen oxygen single bond. The way you can identify it when it is in a compound is by using the valence electron of the partner substance i.e., the metal or hydrogen. let us take an example of sodium peroxide (Na2O2). We know that...
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Correct answer is option (c). Because A peroxide is a compound containing oxygen oxygen single bond. The way you can identify it when it is in a compound is by using the valence electron of the partner substance i.e., the metal or hydrogen. let us take an example of sodium peroxide (Na2O2). We know that sodium has a valency of 1. If it were to bond to oxygen, the compound should contain one oxygen atom and two sodium atoms. When you look at a peroxide of sodium, you find that it contains two oxygen atoms. This suggests that each sodium is bonded to one oxygen atom and since oxygen has a valency of 2, then the extra electron in each oxygen is used to bond the oxygen atoms and thereby attaining stability.

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PGT CHEMISTRY 12 year experience teaching XI-XII Students

KO2
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

KO2
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

In KO2 oxygen in super oxide form O2-
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

KO2 is super oxide
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State as to why
(a) Alkali metals show only +1 oxidation state. (b) Na and K impart colour to the flame but Mg does not.(c) Lithium on being heated in air mainly forms the monoxide and not the peroxide.(d) Li is the best reducing agent in aqueous solution.

a) There is only one valence electron in Alkali metals, on loosing one electron alkali metals achieve noble gas configuration which is most stable. Therefore, in order to achieve stability Alkali metals...
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Which of the following is used in photoelectric cells?
(a) Na (b) K (c) Li (d) Cs
Cs is used in the photoelectric cell due to the lowest ionization enthalpy among all alkali metals.
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Which one of the following alkaline earth metal carbonates is thermally most stable?
(a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3

MgCO3 is most stable alkaline earth metal because it is present in first period.Due to this its nuclear charge is less as compare to other.Due to its less nuclear charge its bond length is small thus it is more stable.
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Name the alkali metal which shows diagonal relationship with magnesium?

Alkali Metal LITHIUM shows diagonal relationship with Alkaline Earth Metal MAGNESIUM
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