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Nascent hydrogen is formed in... I:Zn+...

Nascent hydrogen is formed in...
`I:Zn+dil. HCl " "II.: CH_3OH + Na`
`III: "Electrolysis of " H_2O "` `IV. : "Silent electric discharge of "H_2O_2 " `

A

I,II

B

II, III

C

I, II, III, IV

D

IV

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The correct Answer is:
A
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Which of the following statements are correct? Fuel cells are galvanic cells in which the chemical energy of fuel is directly converted into electrical energy. Type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst (platinum, silver, or metal oxide). The electrodes are placed in aqueous solution of NaOH. Oxygen nad hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(oplus) which is neutralized by overset(Θ)(OH) , ie., anodic reaction. H_(2) hArr 2H^(oplus) + 2e^(-) 2H^(oplus) + 2 overset(Θ)(OH) hArr 2H_(2)O H_(2) + 2 overset(Θ)(OH) hArr 2H_(2)O + 2e^(-) At cathode, O_(2) gets reduced to overset(Θ)(OH) i.e., O_(2) + 2H_(2)O + 4e^(-) hArr overset(Θ)(4)OH Hence, the net reaction is 2H_(2) + O_(2) hArr 2H_(2)O The overall reaction has Delta H= -285.6kJ mol^(-1) and Delta G= -237.4kJ mol^(-1) " at " 25^(@)C A fuel cell is I. A voltaic cell in which continuous supply of fuels are sent at anode to perform oxidation II. A voltaic cell in which fuels such as CH_(4), H_(2) and CO are used up at anode. III. One which involves the reaction of H_(2)- O_(2) fuel cell such as: Anode 2H_(2) + 4 overset(Θ)(OH) rarr 4H_(2)O(I) + 4e^(-) cathode : O+ 2H_(2)O(I) + 4e^(-) rarr 4 overset(Θ)(OH) IV. The efficiency of H_(2)-O_(2) fuel cell is 70 to 75%

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BRILLIANT PUBLICATION-HYDROGEN-LEVEL -II
  1. Hydrogen

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  2. Bond angles H–O–H and H-O-O-in water and hydrogen peroxide repectively...

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  3. Nascent hydrogen is formed in... I:Zn+dil. HCl " "II.: CH3OH + Na ...

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  4. Oụt of the following metals which will give H2 on reaction with NaOH ...

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  5. Under what conditions of temperature and pressure the formation of ato...

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  6. H(2),O(2), can also be obtained by the partial oxidation of 2-propanol...

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  7. Consider following statements : I: AIH3 +H^(-) to AlH4^(-) " " II...

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  8. The hydride ion H^(-) is a stronger base than hydroxide ion, which of ...

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  9. The correct decreasing order of basic strength is

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  10. Zinc gives H2" gas with " H2SO4, and conc. HCl" but not with conc. HN...

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  11. Mass of one atom is 6.66 xx 10^(-23) g. Its percentage in a hydride is...

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  12. Select incorrect statement.

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  13. Select correct statement(s).

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  14. 10 mL of H2O2, solution on treatment with KI and titration of liberate...

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  15. An inorganic substance liberates oxygen on heating and turns an acidic...

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  16. In which of the following reactions does hydrogen act as an oxidising ...

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  17. When H2O2 is added to ice cold solution of acidified potassium dichrom...

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  18. 2g of aluminium is treated separately with excess of dil. H(2)SO(4) an...

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  19. In which reaction, hydrogen peroxide neither acts as an oxidising agen...

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  20. Which one of the following reactions does not form gaseous product?

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