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Least reactive metal is

$(a)\;Fe\qquad(b)\;Ni\qquad(c)\;Os\qquad(d)\;Pt$

1 Answer

Pt, because it is a noble metal and does not react with air, water or acid at room temperature.
Hence (d) is the correct answer.
answered Jan 30, 2014 by sreemathi.v
 
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