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The standard heat of combustion of solid...

The standard heat of combustion of solid boron is equal to `:`

A

`Delta_(f)H^(@)(B_(2)O_(3))`

B

`(1)/(2)Delta_(f)H^(@)(B_(2)O_(3))`

C

`2Delta_(f)H^(@)(B_(2)O_(3))`

D

`-(1)/(2)Delta_(f)H^(@)(B_(2)O_(3))`

Text Solution

Verified by Experts

The correct Answer is:
B
`2B+(3)/(2)O_(2)rarr B_(2)O_(3),Delta_(f)H^(@)of B_(2)O_(3)`
`Delta_(comb.)H^(@)of bo ro n=(1)/(2)Delta_(f)H^(@)ofB_(2)O_(3)`
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P BAHADUR-THERMOCHEMISTRY-Exercise 3a objective problems
  1. Equal volumes of 1M HCI and 1M H(2)SO(4) are neutralised by 1M NaOH so...

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  2. The standard heat of combustion of solid boron is equal to :

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  3. The compound with negative value of heat of formation are called :

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  4. Which reaction is endothermic in nature ?

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  5. Which plot represents for an exothermic reaction ?

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  6. For the reaction ,3O(2)rarr 2O(3),DeltaH=+ve. We can say that :

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  7. The enthalpy changes of formation of the gaseous oxides of nitrogen (N...

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  8. The heats of neutralisation of four acidsA,B,C and D are -13.7,-9.4,-1...

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  9. Which fuel provides the highest calorific values ?

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  10. In a flask, colourless N(2)O(4) is in equilibrium with brown-coloured ...

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  11. The difference between the heats of reaction at constant pressure and ...

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  12. The temperature of a 5mL of strong acid increases by 5^(@) when 5 mL o...

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  13. Heat of combustion of CH(4),C(2)H(4),C(2)H(6) are -890,-1411 and -1560...

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  14. In which case of mixing of a strong acid and a base each of 1N concent...

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  15. The dissociation energy of CH(4) and C(2)H(6) are respectively 360 and...

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  16. Given that , A(s) rarr A(l)DeltaH=x A(l) rarr A(g), DeltaH=y The...

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  17. A person requires 2870kcal of energy to lead normal daily life. If hea...

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  18. If, combustion of 4g of CH(4) liberates 2.5kcal of heat, the heat of c...

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  19. A solution of 500mL of 2M KOH is added to 500mL of 2M HCl and the mixt...

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  20. Under the same conditions, how many mL of 1M KOH and 0.5M H(2)SO(4)sol...

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