-p-Block elements - I — Chemistry STD 11 Science — Question

$CaCO _{3}( s ) \rightarrow CaO ( s )+ CO _{2}( g )$ the values of $\Delta H ^{\circ}$ and $\Delta S^{\circ}$ are $+179.1 kJ mol ^{-1}$ and $160.2\,J / K$ respectively at $298 \,K$ and $1 \,bar$. Assuming that $\Delta H ^{\circ}$ and $\Delta S ^{\circ}$ do not change with temperature, temperature above which conversion of lime-stone to lime will be spontaneous is ........... $K$

$(a)$ Effective nuclear charge for nitrogen is $3.90$

$(b)$ $IP$ of $Ne$ is more than $Na^+$

$(c)$ Order of electron negativity $sp > sp^2 > sp^3$

$(d)$ Order of acidic character $NH_3 < PH_3 < AsH_3$