What Is the Oxidation Number of Chromium in Cr₂O₇^-2

question 40

Multiple Choice

What is the oxidation number of chromium in Cr₂O₇^-2?

• A)+12
• B)0
• C)+6
• D)-4

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Definitions:

Sensorimotor Stage

The first of the four stages of cognitive development in Piaget's theory, spanning from birth to two years, where infants learn through interacting with the environment.

Perceptual Information

Data received by the senses that is then interpreted by the brain to understand the environment.

Violation-of-expectations

A method used in cognitive psychology to study the cognitive processes of infants, based on their reactions to events that defy their understanding of basic physical principles.

Object Permanence

The understanding that objects continue to exist even when they cannot be observed (seen, heard, touched, smelled, or sensed in any way).