Which one of the following metals does NOT react with cold water ?
Calcium (Ca)
Potassium (K)
Magnesium (Mg)
Sodium (Na)
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2019
Alkali metals (like Potassium and Sodium) react vigorously or even explosively with cold water, producing hydrogen gas and their hydroxides. Calcium, an alkaline earth metal, also reacts with cold water, albeit less vigorously than sodium or potassium, forming calcium hydroxide and hydrogen gas. Magnesium, another alkaline earth metal, reacts very slowly with boiling water and reacts readily with steam to form magnesium oxide and hydrogen, but it does not react with cold water.