Substance Q reacts with cold water to form a solution which turns red litmus blue. Substance Q could be
Answer Details
Substance Q reacts with cold water to form a solution which turns red litmus blue. This indicates that the substance is basic or alkaline in nature. Out of the given options, sodium is the only substance that is basic in nature and reacts with cold water to form a solution which turns red litmus blue. Therefore, substance Q could be sodium.