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On being placed in water, sodium peroxid...

On being placed in water, sodium peroxide not only produces an alkaline solution but also bubble. If we assume that the peroxide ion picks up two protons from water to profice a compound that can be seen as the dibasic conjugate acid of peroxide ion and then this compound undergoes a rodox disproportion
`Na_(2)O(s)+H_(2)O(l)to(A)+(B)," "(A) "adn"(B)"are"`

A

`H_(2)O_(2)` and `NaOH`

B

`H_(2)O` and `O_(2)`

C

`NaOH` and `O_(2)`

D

`N a_(2)O` and `NaOH`

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The correct Answer is:
C
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On being placed in water , sodium peroxide not only produces an alkaline solution but also some bubbles . If we assume that the peroxide ion picks up two protons from water to produce a compound that can be seen as the dibasic conjugate acid of peroxide ion and then this compound undergoes a redox disproportion . Using the above the information complete the following equation : Na_(2)O_(2)(s) + H_(2)O(l) rarr (A) (aq) + (B) (g) . (A) and (B) are :

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. Which compounds will liberate oxygen when reacts with ice cold water?

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:

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

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)

NARAYNA-S-BLOCK ELEMENTS-Physical properties
  1. In the formation of superoxide M+O(2)toMO(2), the metal M is

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  2. The mental that does not give superoxide is

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  3. The nitrated of the group I elements decompose not to the oxide but to...

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  4. The main reason for not using a mercury electrolytic cell in NaOH manu...

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  5. When chlorine is passed through concentrated NaOH solution, the compou...

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  6. In the solvy's process the reaction 2NH(4)Cl+Ca(OH)(2)toCaCl(2)+2NH(...

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  7. On heating baking soda the compounds formed are

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  8. Sodium carbonate is treated with acids to from ……gas

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  9. NaHCO(3) is used to remove…… of the stomach

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  10. When a standard solution of NaOH is left in air for a few hours:

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  11. Baking powder is a mixture of (i) NaHCO(3) , (ii) starch (iii) Ca(...

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  12. If NaOH is added to an aqueous solution of Zn^(2+) ions a white precip...

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  13. A mikxture of Al (OH)(3) and Fe(OH)(3) can be sparted easily be treati...

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  14. When sulphur is heated with NaOH (aq) the compounds formed are:

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  15. CO(2)+NH(3)+H(2)OtoX, X+NaCl toT+NH(4)Cl, 2Yoverset(Delta)rarrZ+H(...

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  16. On being placed in water, sodium peroxide not only produces an alkalin...

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  17. Bakng powder used to make cake is a mixture of starch, NaHCO(3) and Ca...

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  18. KO(2) is used in oxygen cylinders in space and submarines because it

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  19. Which property of sodium is being used in street lights ?

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  20. Which of the following matals is sensitive to a wide range of photons ...

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