The stage of cognitive development that begins with the development of language and ends once the child develops a theory of mind and is no longer fooled by the conservation tasks is

The Pre-operational stage (second stage)

Explanation:

The Pre-operational stage (second stage); This is the second stage in Piaget's theory of cognitive development. In this stage, children think symbolically about objects, but they reason based on intuition and superficial appearance rather than logic. 2 years to 7 years, learns to use language and to describe objects using images and words, thinking is still egocentric, classifies objects by a single character

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