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If (I) C+O(2)toCO(2), Q(1) (II) C+(1)/...

If `(I) C+O_(2)toCO_(2)`, `Q_(1)`
`(II) C+(1)/(2)O_(2)toCO`, `Q_(2)`
`(III) CO+(1)/(2)O_(2)toCO_(2)`, `Q_(3)`
The heats of reaction `Q_(1)` and `Q_(2)` are `-12`, `-10` respectively. Then `Q_(3)=`

A

`-2`

B

`2`

C

`-22`

D

`-16`

Text Solution

Verified by Experts

The correct Answer is:
A
`(i) C+O_(2)toCO_(2)`, `Q_(1)=-12`
`(ii) C+(1)/(2)O_(2)toCO`, `Q_(2)=-10`
`(iii) CO+(1)/(2)O_(2)toCO_(2)`, `Q_(3)=?`
To get `Q_(3)`, solve eqn. no. `(i)`-eqn. no. `(ii)`
`:. Q_(3)=-12-(-10)=-12+10=-2`
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