Download App

STD 11 - 5. Thermodynamics and thermochemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
Which of the reaction defines $\Delta H_f^o$
  • A
    ${C_{({\rm{diamond}})}} + {O_2}(g)\, \to \,C{O_2}(g)$
  • ✓
    $\frac{1}{2}{H_2}(g) + \frac{1}{2}{F_2}(g)\, \to \,HF(g)$
  • C
    ${N_2}(g) + 3{H_2}(g)\, \to \,2N{H_3}(g)$
  • D
    $CO(g) + \frac{1}{2}{O_2}(g)\, \to \,C{O_2}(g)$
✓

Answer

Correct option: B.
$\frac{1}{2}{H_2}(g) + \frac{1}{2}{F_2}(g)\, \to \,HF(g)$
b
The standard enthalpy of formation $\left(\Delta H _{ f }^0\right)$ is the enthalpy change during formation of $1\, mole$ of substance when its constituent elements are in their standard states.

Only $(B)$ follows the definition of $\Delta H _{ f }^0$. Therefore, $(B)$ is correct answer.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Assign true $(T)$ and false $(F)$ for following statements and select correct option for your answer

$(a)\, IP$ of $O_{(g)}$ is less than $IP$ of $O_{(g)}^ - $
$(b)\, IP$ of $Ne_{(g)}$ is greater than $IP$ of $Ne_{(g)}^ + $
$(c)\, EA$ of $O_{(g)}^ + $ is greater than $EA$ of $O_{(g)}$
$(d)\, IP$ of $N_{(g)}$ is greater than $IP$ of $N_{(g)}^ + $

→
Electron affinity depends on
→
When $KMn{O_4}$ is reduced with oxalic acid in acidic solution, the oxidation number of $Mn$ changes from
→
Among the given pairs, in which pair first compound reacts faster than second  compound in $S_{N^1}$ reaction ?
→
Which is not amphoteric
→
Sodium carbonate is manufactured by Solvay process, the products that are recycled are
→
A molal solution is one that contain 0.5 mole of a solute in :
→
Stability of $\alpha$-Helix structure of proteins depends upon 
→
If the starting material is $1-$ methyl $-1,2-$ epoxy cyclopentane, of absolute configuration, decide which one compound correctly represent the product of its reaction with sodium methoxide in methanol.
→
Match the reactions in Column $I$ with appropriate options in Column $II$.
Column $I$ Column $II$
$(A)$ $Image$ $(p)$ Racemic mixture
$(B)$ $Image$ $(q)$ Addition reaction
$(C)$ $Image$ $(r)$ Substitution reaction
$(D)$ $Image$ $(s)$ Coupling reaction
  $(t)$ Carbocation intermediate

→