Which of the following represents an exothermic reaction? A(g) + B(g) rightarrow

Question

Which of the following represents an exothermic reaction? A(g) + B(g) rightarrow 2C(g) delta H = + 100 kcal A(g) rightarrow B(g) + 33 kcal 50 kcal + 2A(g) rightarrow C(g) + D(s) Both A and B are exothermic reaction Both A and C are exothermic reactions. What is true about a solution whose pH is less than 7? It has a hydronium ion concentration less than 1 times 10^-7 M. It has a hydronium ion concentration that is higher than pure water itself. It has a hydroxide ion concentration equal to its hydronium ion concentration. It is a solution that requires a buffer. It is a basic solution.

Explanation / Answer

10. The answer is B

The first reaction is endothermic in nature (delta H is +ve). The third reaction is endothermic in nature.

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