MCQ
$H - C \equiv C\mathop {-} \limits^a C \equiv C\mathop {-} \limits^b C{H_3}$
Compare the bond lengths $a$ and $b$
- A$a = b$
- B$a > b$
- ✓$b > a$
- D$a > > > b$
Compare the bond lengths $a$ and $b$

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$CaCO _{3}( s ) \rightarrow CaO ( s )+ CO _{2}( g )$ 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 ........... $K$