Indicate Which of the Following Is Not an Element in Its

question 121

Multiple Choice

Indicate which of the following is not an element in its standard state at 25 C and 1 atm.

• A)O₂(g)
• B)H₂(g)
• C)Ne(g)
• D)N(g)
• E)C(s, graphite)

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Definitions:

Carbonyl Group

A group in chemistry where a carbon atom forms a double bond with an oxygen atom, denoted as C=O.

δ 3.1

A notation indicating a chemical shift of 3.1 in nuclear magnetic resonance (NMR) spectroscopy, often signifying the environment of a hydrogen atom in a molecule.

δ 4.2

A chemical shift value in nuclear magnetic resonance (NMR) spectroscopy indicating the resonance position of certain hydrogen atoms in a molecule relative to a standard reference.

Carbonyl Stretching

A vibrational movement in infrared spectroscopy, indicating the presence of a carbonyl group (C=O) in organic compounds.