Q43 / 180 · AIIMS 2005 · Chemistry

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, $\Delta U$ and $w$ corresponds to

  • Correct answer
    A
    $\Delta U < 0, w=0$
  • B
    $\Delta U < 0, w < 0$
  • C
    $\Delta U>0, w=0$
  • D
    $\Delta U>0, w>0$.

Solution

Bomb calorimeter is commonly used to find the heat of combustion of organic substances which consists of a sealed combustion chamber, called a bomb. If a process is run in a sealed container then no expansion or compression is allowed, so $w=0$ and $\Delta U=q$. $$ \Delta U < 0, w=0 . $$

Hence, the correct answer is option: 'A'.

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