MCQ
Which of the following always has a negative value?
- AHeat of reaction
- BHeat of solution
- CHeat of formation
- ✓Heat of combustion
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$(I)$ $NI_3$ $(II)$ $I_3^-$
$(III)$ $SO_3^{-2}$ $(IV)$ $NO_3^-$
$(A)$ $C _6 H _5 OH$ and $C _6 H _5 COOH$
$(B)$ $C _6 H _5 COOH$ and $C _6 H _5 CH _2 OH$
$(C)$ $C _6 H _5 CH _2 OH$ and $C _6 H _5 OH$
$(D)$ $C _6 H _5 CH _2 OH$ and $C _6 H _5 CH _2 COOH$