Home
Class 12
CHEMISTRY
At 1000^(@)C, Zn((s)) +(1)/(2)O(2(g))...

At `1000^(@)C`,
`Zn_((s)) +(1)/(2)O_(2(g)) to ZnO_((s)), DeltaG^(@)=-360 KJ "mol"^(-1)`
`C_((s)) + (1)/(2)O_(2(g)) to CO_((g)),DeltaG^(@) =-460 KJ "mol"^(-1)`
The correct statement is

A

ZnO is more stable than CO

B

ZnO can be reduced to Zn by C

C

ZnO and CO are formed at equal rate

D

ZnO can not be reduced to Zn by C

Text Solution

Verified by Experts

The correct Answer is:
B

From given reaction, Free energy of the reaction : `ZnO(g)+C(s) underset(1000^(@)C)overset(Delta)to Zn(g)+CO(g)`, is negative.
Promotional Banner

Topper's Solved these Questions

  • METALLURGY

    VK JAISWAL ENGLISH|Exercise Level 2|86 Videos
  • METALLURGY

    VK JAISWAL ENGLISH|Exercise Level 3 (Passive 1)|8 Videos
  • ENVIRONMENTAL CHEMISTRY

    VK JAISWAL ENGLISH|Exercise ASSERTION-REASON TYPE QUESTIONS|14 Videos
  • p-BLOCK ELEMENTS

    VK JAISWAL ENGLISH|Exercise SUBJECTIVE PROBLEMS|35 Videos

Similar Questions

Explore conceptually related problems

Consider the following reactions at 1000^(@)C (I) Zn(s)+1//2O_(2)(g)overset(Delta)to ZnO(g), Delta G^(@)= -360 " kJ mol"^(-1) (II) C(s)+1//2O_(2)(g) overset(Delta)to CO(g), Delta G^(@) = -460 " kJ mol"^(-1) and choose the correct statement at 1000^(@)C

C(s)+(1)/(2)O_(2)(g)to CO(g), Delta H =- 42 kJ/mole CO(g)+(1)/(2)O_(2)(g)to CO_(2)(g) , Delta H =-24 kJ/mole The heat of formation of CO_(2) is

From the data at 25^(@)C : Fe_(2)O_(3)(s) +3C_(("graphite")) rarr 2Fe(s) + 3CO(g), DeltaH^(Theta) = 492.0 kJ mol^(-1) FeO(s) +C_(("graphite")) rarr Fe(s) CO(g), DeltaH^(Theta) = 155.0 kJ mol^(-1) C_(("graphite")) +O_(2)(g) rarr CO_(2)(g), DeltaH^(Theta) =- 393.0 kJ mol^(-1) CO(g)+(1)/(2)O_(2)(g) rarr CO_(2)(g), DeltaH^(Theta) =- 282.0 kJ mol^(-1) Calculate the standard heat of formation of FeO(s) and Fe_(2)O_(3)(s) .

Given : (i) C("graphite") +O_2(g)toCO_2(g)DeltarH^(Theta)="x kj "mol^(-1) (ii) C("graphite") +(1)/(2)O_2(g)toCO(g),DeltarH^(Theta)="y kj "mol^(-1) (iii) CO(g) +(1)/(2)O_2(g) toCO_2(g),DeltarH^(theta)="zkj" mol^(-1) Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?

Methanol can be prepared synthetically by heating carbon monoxide and hydrogen gases under pressure in the presence of a catalyst. The reaction is CO(g) +2H_(2)(g) rarr CH_(3)OH(l) Determine the enthalpy of this reaction by an appropriate combinantion of the following data: a. C_(("graphite")) +(1)/(2)O_(2)(g) rarr CO(g), DeltaH^(Theta)=- 110.5kJ mol^(-1) b. C_(("graphite")) +O_(2)(g) rarr CO_(2)(g), DeltaH^(Theta) =- 393.5 kJ mol^(-1) c. H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(l), DeltaH^(Theta) =- 285.9kJ mol^(-1) d. CH_(3)OH(l) +(3)/(2)O_(2)(g)rarr CO_(2)(g) +2H_(2)O(l),DeltaH^(Theta) =- 726.6 kJ mol^(-1)

Calculate enthalpy of formation of methane (CH_4) from the following data : (i) C(s) + O_(2)(g) to CO_(2) (g) , Delta_rH^(@) = -393.5 KJ mol^(-1) (ii) H_2(g) + 1/2 O_(2)(g) to H_(2)O(l) , Deta_r H^(@) = -285.5 kJ mol^(-1) (iii) CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l), Delta_(r)H^(@) = -890.3 kJ mol^(-1) .

At 25^(@)C , the following heat of formations are given: {:("Compound",SO_(2)(g),H_(2)O(l),,),(Delta_(f)H^(Theta)kJmol^(-1),-296.0,-285.0,,):} For the reactions at 25^(@)C , 2H_(2)S(g) +Fe(s) rarr FeS_(2)(s) +2H_(2)(g), DeltaH^(Theta) =- 137 kJ mool^(-1) H_(2)S(g) +(3)/(2)O_(2)(g) rarr H_(2)O(l) +So_(2)(g),DeltaH^(Theta) =- 562kJ mol^(-1) Calculate the heat of formation of H_(2)S(g) and FeS_(2)(g) at 25^(@)C .

The standard Gibbs free energies for the reaction at 1773K are given below: C(s) +O_(2)(g) rarr CO_(2)(g), DeltaG^(Theta) =- 380 kJ mol^(-1) 2C(s) +O_(2)(g) hArr 2CO(g),DeltaG^(Theta) =- 500 kJ mol^(-1) Discuss the possibility of reducing Al_(2)O_(3) and PbO with carbon at this temperature, 4Al +3O_(2)(g) rarr 2Al_(2)O_(3)(s),DeltaG^(Theta) =- 22500 kJ mol^(-1) 2Pb +O_(2)(g) rarr 2PbO(s),DeltaG^(Theta) =- 120 kJ mol^(-1)

At 1250 K 2FeO(s)to2Fe(s)+O_(2)(g) , DeltaG=+320kJmol^(-1) of O_(2) 2C(s)+O_(2)(g)to2CO(g) , DeltaG=-430 kJ mol^(-1) of O_(2) The following coupled reaction is spontaneous because 2FeO(s)+2C(s)to2Fe(s)+2CO(g)

With the following infromations, determine standard Gibb's free energy of formation of N_(2)O_(4)(g). (1)/(2)N_(2)(g) + (1)/(2)O_(2)(g) rarr NO(g) " "DeltaG^(@)=86.6 KJ " ""….."(i) NO(g) + (1)/(2)O_(2)(g) rarr NO_(2)(g) " "DeltaG_(@) =34.82 KJ " ""....."(ii) 2NO_(2)(g) rarr N_(2)O_(4)(g) " G= 5.77 ""....."(iii)

VK JAISWAL ENGLISH-METALLURGY-ASSERTION-REASON TYPE QUESTIONS
  1. At 1000^(@)C, Zn((s)) +(1)/(2)O(2(g)) to ZnO((s)), DeltaG^(@)=-360 ...

    Text Solution

    |

  2. Assertion : PbSiF(6)+H(2)SiF(6)+ gelatine is taken as electrolyte in e...

    Text Solution

    |

  3. Assertion : Nitriding is the process of heating steel in presence of N...

    Text Solution

    |

  4. Assertion : Ores are generally converted into oxides, prior to reducti...

    Text Solution

    |

  5. Assertion : In the extraction of Ag, complex Na[Ag(CN)(2)] is reacted ...

    Text Solution

    |

  6. Assertion : Thermite mixture Fe(2)O(3) +Al (powder) is used in the wel...

    Text Solution

    |

  7. Assertion : In froth floatation process sodium ethyl xanthate is used ...

    Text Solution

    |

  8. Assertion : Cryolite is used in electrolytic extraction of Al from alu...

    Text Solution

    |

  9. Assertion: CuFeS(2) is concentrated by froath floatation method Reas...

    Text Solution

    |

  10. Assertion : In the electrolytic reduction of Al(2)O(3), cryolite is us...

    Text Solution

    |

  11. Assertion : Wrought iron is more malleable and ductile than steel. R...

    Text Solution

    |

  12. Assertion : Lead, tin and bismuth are purified by liquation method. ...

    Text Solution

    |

  13. Assertion : Al(2)O(3) is converted into Al by reduction with carbon at...

    Text Solution

    |

  14. Assertion : Reduction of ZnO with carbon is done at 1100^(@)C. Reaso...

    Text Solution

    |

  15. Assertion : Desilverisation of lead is done by Parke's method DeltaG. ...

    Text Solution

    |

  16. Statement-I : All the ores are mineral Statement-II : Most of the or...

    Text Solution

    |

  17. Assertion : PbSiF(6)+H(2)SiF(6)+ gelatine is taken as electrolyte in e...

    Text Solution

    |

  18. Assertion : Nitriding is the process of heating steel in presence of N...

    Text Solution

    |

  19. Assertion : Ores are generally converted into oxides, prior to reducti...

    Text Solution

    |

  20. Assertion : In the extraction of Ag, complex Na[Ag(CN)(2)] is reacted ...

    Text Solution

    |

  21. Assertion : Thermite mixture Fe(2)O(3) +Al (powder) is used in the wel...

    Text Solution

    |