9. Hydricarbon — Chemistry STD 11 Science — Question

$1.$ The state $S_1$ is

$(A)$ $1 \mathrm{~s}$ $(B)$ $2 \mathrm{~s}$ $(C)$ $2 \mathrm{p}$ $(D)$ $3 \mathrm{~s}$

$2.$ Energy of the state $S_1$ in units of the hydrogen atom ground state energy is

$(A)$ $0.75$ $(B)$ $1.50$ $(C)$ $2.25$ $(D)$ $4.50$

$3.$ The orbital angular momentum quantum number of the state $S_2$ is

$(A)$ $0$ $(B)$ $1$ $(C)$ $2$ $(D)$ $3$

Give the answer question $1,2$ and $3.$

$\Delta {H^o}\, = \, +234.1\,\,kJ$

$C(s)\, + {O_2}(g)\, \to \,\,C{O_2}(g)$

Use these equation and $\Delta H^o$ value to calculate $\Delta H^o$ for this reaction:

$4Fe(s) + 3O_2(g) \to 2Fe_2O_3(s)$

.....$kJ$