a piece of metal is dropped in cold water, the water slowly becomes turbid and effervescence is observed. What will you observe, if the blue litmus paper is dipped into the turbid water? identify the metal and justify the observation. 

Pls give the answer quickly please i have test day after tomorrow. 

Experts pls help.

The metal is calcium.Calcium being heavier than water sinks to the bottom and forms tubidity due to formation of calcium hydroxide (Ca(OH) 2) and release hydrogen gas due to which effervescence is observed. The reaction is as follows:

Ca + 2H2O → Ca(OH)2 + H2 

Calcium hydroxide is basic, therefore the solution will become alkaline and thus there will be on effect on the blue litmus paper.

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