8.2 Organic chemistry isomerism — Chemistry STD 11 Science — Question

$(I)\, H_2S_2O_6$           $(II)\, H_2S_2O_3$           $(III)\,H_2S_2O_5$ 

Assertion $(A) :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.

Reason $(R)$ $:$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.

In the light of the above statements, choose the most appropriate answer from the options given below :

$(A)$ The principal quantum number $'n'$ is a positive integer with values of $'n'=1,2,3, \ldots$.

$(B)$ The azimuthal quantum number $'l'$ for a given $'n'$ (principal quantum number) can have values as $'l'=0,1,2, \ldots n$

$(C)$ Magnetic orbital quantum number $'m _{l}'$ for a particular $'l'$ (azimuthal quantum number) has $(2 l$ + 1) values.

$(D)$ $\pm 1 / 2$ are the two possible orientations of electron spin.

$(E)$ For $l=5$, there will be a total of $9$ orbital.

Which of the above statements are correct?

$C + 2S \to CS_2 ;  \,\Delta H_f^o = +117.0\,kJ\,mol^{-1} .......(1)$

$C + O_2 \to CO_2 ; \,\Delta H_f^o = -393\,kJ\,mol^{-1} .......(2)$

$S + O_2 \to SO_2 ; \, \Delta H_f^o = -297\,kJ\,mol^{-1} .......(3)$

The heat of reaction of

$CS_2 + 3O_2 \to CO_2 + 2SO_2$ is

.....$kJ\,mol^{-1}$