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  • 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

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

Answers (1)

Ans. (b)
(a) When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide (dazzling white flame).
2Mg\left ( s \right )+O_{2}\left ( g \right )\rightarrow 2MgO\left ( s \right )+energy
(b) Magnesium metal does not react with cold water.
(c, d) Mg reacts with hot water and steam both. The reaction is shown below:
Mg\left ( s \right )+HO_{2}\left ( hot\, or\, steam \right )\rightarrow Mg\left ( OH \right )_{2}+H_{2}\left ( g \right )
It gives magnesium hydroxide and hydrogen gas

Therefore option (b) is correct answer

 

 

 

 

 

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infoexpert27

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