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ARC-Challenge / TIMSS_2011_8_pg102 / Robert put two drops of an indicator into vinegar, and the color turned red. He…

Problem

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question

Robert put two drops of an indicator into vinegar, and the color turned red. He then added drops of ammonia solution until the color disappeared. What process occurred?

choices

rusting
melting
evaporation
neutralization

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Source and history

upstream_id / Original problem ID: TIMSS_2011_8_pg102
task_id: 5ddb7387-091c-55ac-93e6-b5581b23821e
task_key: ARC~2dChallenge--test--TIMSS~5f2011~5f8~5fpg102
task_revision_id: 2
config / split: ARC-Challenge / test

Official source

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