2. Solved Papers
  3. Manipal Engineering

Manipal Engineering Manipal Engineering Solved Paper-2012

  • question_answer
    \[{{S}_{\text{(rhombic)}}}+{{O}_{2}}(g)\xrightarrow{{}}S{{O}_{2}}(g),\]                                                 \[\Delta H=-297.5\,\,kJ\] \[{{S}_{(monoclinic)}}+{{O}_{2}}(g)\xrightarrow{{}}S{{O}_{2}}(g),\]                                                 \[\Delta H=-300\,\,kJ\] The data can predict that

    A) rhombic sulphur is yellow in colour

    B) monoclinic sulphur has metallic lusture

    C) monoclinic sulphur is more stable

    D) \[\Delta {{H}_{transition}}\]of\[{{S}_{R}}\]to\[{{S}_{M}}\]is endothermic

    Correct Answer: D

    Solution :

    Subtracting equation (II) from (I), we get                 \[{{S}_{R}}\xrightarrow{{}}{{S}_{M}}\],\[\Delta H=+2.5\,\,kJ\] Thus,\[{{S}_{R}}\]to\[{{S}_{M}}\]transition is an endothermic reaction.


You need to login to perform this action.
You will be redirected in 3 sec spinner