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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?

AAKASH INSTITUTE ENGLISH-THE S-BLOCK ELEMENTS-Try Yourself
  1. Why are potassium and caesium rather than lithium used in photoelectri...

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  2. What do metal oxides form when they react with water?

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  3. K, Rb and Cs form mainly superoxides.

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  4. Which compound is formed when lithium reacts directly with nitrogen in...

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  5. What is electrode potential?

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  6. If an element has more negative value of electrode potential, then wha...

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  7. Apart from water, alkali metals react with which kind of compounds?

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  8. Mention the important properties of saline hydrides

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  9. Except for lithium, alkali metals form their hydrides at what temperat...

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

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  11. Among the alkali metals, which element has the highest reducing power...

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  12. If standard electrode potential of an element x is -1.70V and of anoth...

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  13. The alkali metals dissolve in ammonia to give a deep blue solution whi...

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  14. Why is the solution of an alkali metal in ammonia blue?

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  15. The blue coloured solution is diamagnetic or paramagnetic?

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  16. The bronze coloured solution is diamagnetic or paramagnetic?

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  17. What kind of oxides are formed by sodium?

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  18. What is the trend of enthalpy of formation of alkali metal fluoride?

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  19. The melting and boiling points of alkali metal halides always follow t...

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  20. Write two properties of alkali metals salts of oxo-acids.

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