Gold Does Not React with Either Nitric Acid or Hydrochloric

question 22

Multiple Choice

Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia. Identify the oxidizing agent in the following equation: Au(s) + 4 H⁺ + NO₃^- + 4 Cl- → [AuCl₄]^- + 2 H₂O + NO(g)

• A) Au
• B) H⁺
• C) NO₃^-
• D) Cl-
• E) NO₃^- and H⁺

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Definitions:

Correlation Coefficient

The correlation coefficient is a statistical measure that calculates the strength and direction of a linear relationship between two variables on a scale of -1 to 1.

Covariance

Covariance is a measure used in statistics to determine how two variables move in relation to each other, often used in portfolio theory to assess risk.

Reward-to-Variability Ratio

A measure of the return on an investment relative to its risk, higher values indicate better risk-adjusted returns.

Standard Deviation

A statistical measure that quantifies the variability or dispersion of a set of data points or the volatility of an investment's returns.