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Biochemistry Mcqs

Q:

?G is negative for which of the following processes?

A) Melting of ice and evaporation of water B) Oxidation of nitrogen
C) Oxidation of gold D) Burning of chlorine
 
Answer & Explanation Answer: A) Melting of ice and evaporation of water

Explanation: The Gibb’s free energy change (?G) must have a negative value for a process to occur spontaneously.
Melting of ice and evaporation of water are the two spontaneous processes at room temperature.

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Q:

What makes water a liquid at room temperature?

A) Hydrogen bonds between water molecules B) Covalent bonding
C) Noncovalent interactions D) Van der Waals forces of attraction
 
Answer & Explanation Answer: A) Hydrogen bonds between water molecules

Explanation: Hydrogen bonds between water molecules provide the cohesive forces that make water a liquid at room temperature.

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