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Q.

On combustion of Li, Na and K in excess of air, the major oxides formed, respectively. are

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a

${Li}_{2} O, {Na}_{2} O$ and ${KO}_{2}$

b

${Li}_{2} O, {Na}_{2} O$ and $K_{2} O_{2}$

c

${Li}_{2} O, {Na}_{2} O$ and $K_{2} O$

d

${Li}_{2} O, {Na}_{2} O_{2}$ and $K_{2} O_{2}$

answer is D.

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Detailed Solution

On heating in excess air $Li$ form oxide, sodium form peroxide while $K, Rb, Cs$ form superoxide.

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