The equation 1 2 H_2 + 1 2 C l_2 HCl ( H_ 298 = - 22060 ,kcal) me… - Vidyadip

MCQ

The equation $\frac{1}{2}{H_2} + \frac{1}{2}C{l_2} \to HCl$ ($\Delta {H_{298}} = - 22060\,kcal$) means

A
The heat absorbed when one gram molecule of $HCl$ is formed from its elements at ${25\,^o}C$ is $22.060\, kcal$
✓
The heat given out when one gram molecule of $HCl$ is formed from its elements at $298 \,K$ is $22.060\, kcal$
C
The heat absorbed when one atom of hydrogen reacts with one atom of chlorine to form one molecule of $HCl$ at ${25\,^o}C$ and one atmospheric pressure is $ 22.060\, kcal$
D
The heat absorbed when one gram equivalent of $HCl$ is formed from its elements at $298 \,K $ is $22.060\, kcal$

✓

Answer

Correct option: B.

The heat given out when one gram molecule of $HCl$ is formed from its elements at $298 \,K$ is $22.060\, kcal$

(b)It means that the heat absorbed when one gram molecule of $HCl$ is formed from its elements at $298\,K$ is
$ = 22.060\,k\,cal$

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

Which of the following has maximum mass

The electronic configuration of three elements $A,B$ and $C$ are given below. Stable form of $A$ may be represented by the formula

$A : 1s^2\, 2s^2\, 2p^6$
$B : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^3$
$C : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$

If $S + {O_2} \to S{O_2};\,(\Delta H = - 298.2)$ $S{O_2} + \frac{1}{2}{O_2} \to S{O_3};\,(\Delta H = - 98.2)$$S{O_3} + {H_2}O \to {H_2}S{O_4};\,(\Delta H = - 130.2)$ ${H_2} + \frac{1}{2}{O_2} \to {H_2}O;\,(\Delta H = - 287.3)$ then the enthalpy of formation of ${H_2}S{O_4}$ at $298\,K $ will be......$kJ$

benzene $+ ClC{H_2}C{H_2}C{H_3}\xrightarrow{{AlC{l_3}}}M\xrightarrow{{(i)\,{O_2}/\Delta ,\,\left( {ii} \right)\,\,{H_2}{O^ \oplus }\,}}N + $ phenol Here $M$ and $N$ are

An organic dye, cosine used to detect end point of precipitation titration by adsorption is called

The value of $\Delta H_{O-H}$ is $109\,k\,cal\,mol^{-1}.$ Then formation of one mole of water in gaseous state from $H(g)$ and $O(g)$ is accompanied by

The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is shown below. The $K _{\text {phenolphthalein }}=4 \times 10^{-10}$. Given: $\log 2=0.3$

The number of following statements which is/are correct about phenolphthalein is $.....$.

$A$. It can be used as an indicator for the titration of weak acid with weak base.

$B$. It begins to change colour at $pH =8.4$

$C$. It is a weak organic base

$D$. It is colourless in acidic medium

$n - {\text{Heptane}}\xrightarrow[\Delta ]{{A{l_2}{O_3}}}P\xrightarrow[{\left[ {1\,mole} \right]}]{{NBS}}Q$ Product $Q$ will be

Find the moleculer weight of a solid containing $20\%$ by mole of $S$ atoms, whose $400\ g$ provides just sufficient $S$ atoms to produce enough $H_2SO_4$ to neutralise $100\ g\ NaOH$

Which of the following pollutant $(s)$ catalyse $(s)$ the oxidation of sulphur dioxide to sulphur trioxide?