Assume each reaction is carried out in an open container. For whi… - Vidyadip

MCQ

Assume each reaction is carried out in an open container. For which reaction will $\Delta H = \Delta E$ ?

✓
$H_2(g) + Br_2(g) \to 2HBr(g)$
B
$C(s) + 2H_2O(g) \to 2H_2(g) + CO_2(g)$
C
$PCl_5(g) \to PCl_3(g) + Cl_2(g)$
D
$2CO(g) + O_2(g) \to 2CO_2(g)$

✓

Answer

Correct option: A.

$H_2(g) + Br_2(g) \to 2HBr(g)$

a
We know that, $\Delta H =\Delta U +\Delta PV$

But for a physical or chemical change, $\Delta H =\Delta U +\triangle ng\,RT$

where, $\triangle_{ n } g =$ No. of gaseous moles of product- Reactant

So, For $\Delta H =\Delta U$ or $\Delta H =\Delta E$

$\triangle ng$ has to $=0$

In $A$ option $\Delta ng =2-2=0$; Therefore, $\Delta H =\Delta E$.

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

More "M.C.Q (1 Marks)" from 5. Thermodynamics and thermochemistry→5. Thermodynamics and thermochemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The $IUPAC$ name of is

The $H-$ bonds in solid $HF$ can be best represented as

The magnetic quantum number for an electron when the value of principal quantum number is $2$ can have ............ $\mathrm{values}$

Which of the following elements has a limited co$-$ordination number of four?

The reaction, $(CH_3)_2C = CH_2 + B{{r}^{\centerdot }} \to (CH_3)_2 \overset{\centerdot }{\mathop{C}}\,- CH_2Br$

is an example of a/an ................ step in a radical chain reaction.

Bohr’s model can not explain the emission spectrum of

The addition of $HI$ in the presence of peroxide catalyst does not follow anti-Markovnikov's rule because

With regard to the gaseous state of matter which of the following statements are correct?

For a molecule with the formula $AB,$ the molecular shape is :

$'O-N-O'$ bond angle is maximum in ?