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K, Rb and Cs form mainly superoxides....

K, Rb and Cs form mainly superoxides.

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Assertion: K, Rb and Cs form superoxides. Reason: The stability of the superoxides increases from 'K' to 'Cs' due to decrease in lattice energy.

K, Rb and Cs form which type of compounds with oxygen?

Lithium only forms monoxide when heated in oxygen. Sodium forms monoxide and peroxide in excess of oxygen. Other alkali metals form superoxide metals superoxide with oxygen i.e., MO_(2) . The abnormal behaviour of lithium is due to small size. The larger size of higher metals also decides the role in formation of superoxide. All the three anions abstract proton from water. The three anions are raleted to each other as follows: underset("oxide ion")(O^(2-)overset((1)/(2)O_(2))(to)underset("peroxide ion")(O_(2)^(2-))overset(O_(2))(to)underset("superoxide ion")(2O_(2)^(-)) Q. In hydrolysis, the alkali metals oxides, peroxide and superoxide act as:

Lithium only forms monoxide when heated in oxygen. Sodium forms monoxide and peroxide in excess of oxygen. Other alkali metals form superoxide metals superoxide with oxygen i.e., MO_(2) . The abnormal behaviour of lithium is due to small size. The larger size of higher metals also decides the role in formation of superoxide. All the three anions abstract proton from water. The three anions are raleted to each other as follows: underset("oxide ion")(O_(2)^(2-)overset((1)/(2)O_(2))(to)underset("peroxide ion")(O_(2)^(2-))overset(O_(2))(to)underset("superoxide ion")(2O_(2)^(-)) Q. Consider the following reaction : M+O_(2) to MO_(2) (M=alkali metal) (stable superoxide)

Assertion : Generally alkali and alkaline earth metals form superoxides. Reason : There is single bond between O and O in superoxides.

What kind of metals can form superoxides?

The metal which will form most stable superoxide is

The products obtained on hydrolysis of superoxide

In K,Rb and Cs, the decreasing order of reducing power in gaseous state is:-

Which among Na,K,Cs and Li forms most stable hydride?

ICSE-THE s - BLOCK ELEMENTS-TRUE OR FALSE. TYPE QUESTIONS (State whether the following statements are True or False:
  1. The density of alkali metals increases from Li to Cs.

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  2. 'Each alkali metal is the most electropositive element in its period'....

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  3. The correct order of hydration enthalpies of alkali metal ions is:

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  4. Li is used in photoelectric cells.

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  5. K, Rb and Cs form mainly superoxides.

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  6. Why are lithium halides partially covalent ? Explain with examples.

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  7. Inspite of very high ionisation energy, lithium is the strongest reduc...

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  8. When an alkali metal dissolves in liquid ammonia the solution can acqu...

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  9. The densities of alkaline earth metals are much smaller than those of ...

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  10. Why are the second ionisation energies of alkaline earth metals much s...

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  11. Why do alkaline earth metals and their compounds impart characteristic...

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  12. The flame test with a salt P gave a brick red flame. What is the catio...

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  13. Be(OH)2 is

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  14. BaCl2 is a low melting volatile solid.

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  15. Assertion : Among alkaline earth metals, Be predominantly forms covale...

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  16. Why do lithium and sodium not occur in free state in nature ?

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  17. Lithium forms alloys with a number of metals. Why?

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  18. Sodium acts as a strong reducing agent. Why?

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  19. Hydrated magnesium chloride on heating gives magnesium oxide.

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  20. Plaster of Paris is chemically calcium sulphate monohydrate.

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