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(NH(4))(2). Cr(2)O(7) overset(Delta) to...

`(NH_(4))_(2). Cr_(2)O_(7) overset(Delta) to N_(2)(g) + 4H_(2)O(l) + X(s)`
Mention the substances 'X' in this reason.

A

`Cr_(2)O_(3)`

B

`K_(2)CrO_(4)`

C

`NH_(3)`

D

`CrO_(4)`

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The correct Answer is:
A
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Hydrogen peroxide can be prepared by successive reaction: 2NH_(4)HSO_(4) rarr H_(2)+(NH_(4))_(2)S_(2)O_(8) (NH_(4))_(2)S_(2)O_(8)+2H_(2)O rarr 2NH_(4)HSO_(4)+H_(2)O_(2) The first reaction is an electrolytic reaction the second is steam distillation. what amount ofcurrent would have to be used in first reaction to produce enough intermediate to yield 100g pure H_(2)O_(2) per hour ? Assume 50% anode current efficiency.

H_(2)O_(2) can be produced by the Ammonium hydrogen sulphate. Reactions occuring in electrolytic cell. NH_(4)HSO_(4) rarr NH_(4)^(+) +H^(+) +SO_(4)^(2-) 2SO_(4)^(2-) rarr S_(2)O_(8)^(2-) +2e^(-) (Anode) 2H^(+) +2e^(-) rarr H_(2) (cathode) (NH_(4))_(2)S_(2)O_(8) +2H_(2)O rarr 2NH_(4)HSO_(4) +H_(2)O_(2) Hydrolysis of Ammonium persulphate Assume 100% yield of hydrolysis reaction. What is the current efficiency when 100 Amp current is passed for 965 sec, in order to produce 17 gm of H_(2)O_(2) .

The standard entropy change Delta S_r^@ for CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_2O_((l)) is -242.98 JK^(-1) at 25^@C . Calculate the standard reaction enthalpy for the above reaction if standard Gibbs energy of formation of CH_(4(g)), CO_(2(g)) and H_2O_((l)) are -50.72, -394.36 and - 237.13 kJ mol^(-1) respectively.

KUMAR PRAKASHAN-THE P-BLOCK ELEMENTS -SECTION-E (MULTIPLE CHOICE QUESTIONS (MCQS)) (MCQS ASKED IN BOARD EXAM)
  1. Which of following oxide is not acidic ?

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  2. Which of the following elements is not included in Group-15 ?

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  3. (NH(4))(2). Cr(2)O(7) overset(Delta) to N(2)(g) + 4H(2)O(l) + X(s) ...

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  4. Which of the following statements is not applicable to white phosphoru...

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  5. Which acid is obtained by dissolving P(4)O(6) in water ?

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  6. What is the aquaregia ?

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  7. Which interhalogen compound is identified by spectroscopic method ?

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  8. What is the colour of ICl3 ?

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  9. Which is the molecule that possesses pentagonal pyramid structure?

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  10. Select the proper choice by true statement by symbol "T" and false sta...

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  11. Oxidation number of sulphur in sulphuryl chloride is

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  12. Geometrical shape of XeF6 is

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  13. The oxidation state of phosphorus in phosphonic acid is

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  14. Which element comes in 5th period of chalcogen group ?

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  15. 4Cu + 10HNO(3) to Cu(NO(3))(2) + X + H(2)O Mention the substance 'X'

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  16. Which one is common chief minerals for phosphorous and fluorine elemen...

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  17. Which compound of phosphorus act as a ligands ?

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  18. On Hydrolysis of phosphorus oxychloride which acid is formed ?

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  19. Select the correct order of electron gain enthalpy for F, CI, Br, I.

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  20. When 4 mole, 3 mole and 1 mole of copper reacts with nitric acid, whic...

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