The conversion of carbonate to urea is:
Correct answer: C. Slow and endothermic
- A. Slow and exothermic
- B. Fast and exothermic
- C. Slow and endothermic
- D. Fast and endothermic
Explanation
The correct answer is that the conversion of carbonate to urea is slow and endothermic. This means that the reaction takes place over a prolonged period and absorbs heat energy from its surroundings. The reaction requires energy input to break bonds in the reactants and form new bonds in the product. The incorrect options either wrongly describe the energy change as exothermic or incorrectly describe the reaction speed as fast.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Reactions of Group IV Elements
Group IV, or Group 14, chemistry covers the trends from carbon and silicon to tin and lead, including their reactions with oxygen, halogens, water, acids and alkalis. It also examines the structures and properties of their oxides and chlorides, oxidation states, and the inert pair effect, rather than treating all members as equally metallic.
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