Question 27 - MCQs from NCERT Exemplar - Chapter 3 Class 10 - Metals and Non-Metals

Last updated at August 12, 2026 by

Which among the following statements is incorrect for magnesium metal?

(A) It burns in oxygen with a dazzling white flame

(B) It reacts with cold water to form magnesium oxide and evolves hydrogen gas

(C) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas

(D) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas

 

Answer

  • Magnesium metal burns in oxygen with a dazzling white flame.

    Reaction of Magnesium with Oxygen - Teachoo.png

                              

  • It does not react with cold water but reacts with hot water to form magnesium hydroxide and hydrogen gas is released.

          Reaction of Magnesium with Water - Teachoo.png

  • Magnesium can also react with steam to give magnesium hydroxide and hydrogen gas. 


So, the correct answer is (b) it reacts with cold water to form magnesium oxide and evolves hydrogen gas.

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