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For the reaction of one mole of zinc dus...

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

A

`DeltaU lt 0, w =0`

B

`DeltaU lt 0, w lt 0`

C

`DeltaU gt 0, w gt 0`

D

`Delta U gt 0, w gt 0`

Text Solution

Verified by Experts

The correct Answer is:
A
In bomb calorimeter, volume is constant, so, w=0 and `DeltaU=q`.
Since, q is calculated by the change in temperature of calorimeter, we have to notice the sign of `DeltaU`. For example `DeltaU` is negative and for endothermic `DeltaU` is `+ve`.
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