Home
Class 12
CHEMISTRY
Factors that influence the heat of forma...

Factors that influence the heat of formation is(are) :
I. The physical state of reactants and products
II. The temperature
III. The pressure or volume
IV. The method by which the final products are obtained The correct option is :

A

I, II

B

II, III

C

I,II,III

D

IV

Text Solution

Verified by Experts

The correct Answer is:
C
The amount of heat either evolved or absorbed when one gram mole of a substance is formed form its constituent elements, is known as the standard heat of formation `(Delta H_(E)^@)`.
For standard state temperature is `25^@C` or 298 K and pressure of gaseous substance is one atmosphere.
Promotional Banner

Topper's Solved these Questions

  • THERMOCHEMISTRY

    VMC MODULES ENGLISH|Exercise LEVEL-2|65 Videos

  • THERMOCHEMISTRY

    VMC MODULES ENGLISH|Exercise JEE MAIN (ARCHIVE)|20 Videos

  • THERMOCHEMISTRY

    VMC MODULES ENGLISH|Exercise LEVEL - 0 Long Answer Type|13 Videos

  • THEORY OF SOLUTIONS

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive)|31 Videos

  • THERMODYNAMICS

    VMC MODULES ENGLISH|Exercise JEE ADVANCED (ARCHIVE)|44 Videos

Similar Questions

Explore conceptually related problems

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

For which of the following reaction is product formation favoured by low pressure and high temperature?

For which of the following reaction is product formation favoured by low pressure and high temperature?

The oxidation of SO_(2) by O_(2) to SO_(3) is an exothermic process. The yield of SO_(3) is maximum if i. Temperature is increased and pressure is kept constant ii. Temperature is reduced and pressure is kept constant iii. Pressure is increased iv. Temperature and pressure both are increased The correct option is:

Four moles of an ideal gas at a pressure of 4 atm and at a temperature of 70^(@)C expands is othermally to four times its initial volume : What is (i) the final temperature and (ii) the final volume ?

Which of the following ways are suitable for increasing food production? I) Agrochemical based agriculture. II) Organic agriculture. III) Genetically engineered crop-based agriculture. Choose the correct option.

Which of the following are correct (B) and (C ) products, respectively ? I. II. , III. IV. , v.

The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct? The correct choice is :

Will the kinetic energy of molecules increase, decrease or remain same if : (i) the temperature is increased ? (ii) the pressure is decreased ? (iii) the volume is decreased ?

Match column -I (microbes) to the column-II (biological products) and select the option having correct matching.

VMC MODULES ENGLISH-THERMOCHEMISTRY-LEVEL-1
  1. What is observed at equilibrium point in the reaction ? PCl(5(g))hAr...

    Text Solution

    |

  2. The enthalpy change (DeltaH) for the process, N(2)H(4)(g)to 2N(g)+4H(g...

    Text Solution

    |

  3. Factors that influence the heat of formation is(are) : I. The physic...

    Text Solution

    |

  4. For the reaction, 2H(2)(g)+O(2)(g) to 2H(2)O(g), DeltaH=-573.2kJ T...

    Text Solution

    |

  5. The bond energy of an O -H bond is 109 K. cal "mole"^(-1). When a mole...

    Text Solution

    |

  6. The heat of combustion of sucrose (C12H22O11) is 1350 kcal/mol. How mu...

    Text Solution

    |

  7. Consider the following reactions. I. C("graphite") + O(2)(g) rarr CO...

    Text Solution

    |

  8. From Q62. above Delta H(f)^(@)(CO) is:

    Text Solution

    |

  9. Consider the following reactions, I. N(2) + O(2) rarr 2NO, " "De...

    Text Solution

    |

  10. Heat of reaction A(s) + B(g) rarr 2C(g) is 40 kJ at 300 K and constant...

    Text Solution

    |

  11. DeltaH combustion for CH(4),C(2)H(6), and C(3)H(8) are -210.8,-368.4 a...

    Text Solution

    |

  12. Calorific value of H2 is -143KJ g^(-1) . Hence, Delta H(f)^(@) of H2O...

    Text Solution

    |

  13. Consider the following reactions: I. C(s) + 1/2 O(2)(g) rarr CO(g),"...

    Text Solution

    |

  14. The dissolution of CaCl(2)cdot 6H(2)O in large volume of water is endo...

    Text Solution

    |

  15. Lattice energy of NaCl((s)) is -788kJ mol^(-1) and enthalpy of hydrati...

    Text Solution

    |

  16. Bond energies of N -= N H-H, N - H are respectively x1 , x2, x and X3...

    Text Solution

    |

  17. H(2)(g) + 1/2 O(2)(g) rightarrow H(2)O(l) H(2)O(f) rightarrow H(2)O(g)...

    Text Solution

    |

  18. Which of the following equations has/have enthalpy changes equal to De...

    Text Solution

    |

  19. The heat of atomisation of PH(3)(g) and P(2)H(4)(g) are 954 kJ mol^(-1...

    Text Solution

    |

  20. An imaginary lattice is formed as given Cl(2) rarr 2Cl" "DeltaH...

    Text Solution

    |