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AIIMS 2015
Exam
AIIMS
Year
2015
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2015 · Chemistry · Thermodynamics (C)

For the reaction of one mole of zinc dust with one mole of...

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, ΔU\Delta U and ww correspond to

Options

  1. AΔU<0,w=0\Delta U < 0, w=0
  2. BΔU<0,w<0\Delta U < 0, w < 0
  3. CΔU>0,w=0\Delta U>0, w=0
  4. DΔU>0,w>0\Delta U>0, w>0

Correct answer

A. ΔU<0,w=0\Delta U < 0, w=0

Step-by-step solution

Bomb calorimeter commonly used to find the heat of combustion of organic substances, consists of a sealed combustion chamber, called a bomb. The reaction in a bomb calorimeter proceeds at constant volume so, w=0w=0 and ΔU=q\Delta U=q. Hence, ΔU<0,w=0\Delta U < 0, w=0.
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