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Q.

Metals react with cold water and give:


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a

Metal oxides

b

Metal oxides and oxygen

c

Metal oxides and hydrogen

d

Metal hydroxides and hydrogen 

answer is C.

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Detailed Solution

concept - When metals react with water, they form the corresponding metal hydroxide and hydrogen gas.
Metal + water→Metal hydroxide + hydrogen
Some examples of metals reacting with cold water are-
Most metals do not react with water. However, alkali metals react violently with water.
The reaction of sodium metal with water: Sodium metal forms sodium hydroxide and releases hydrogen gas along with a large amount of heat when it reacts with water.
Na +  H 2 O→NaOH +  H 2
The reaction of potassium metal with water: Potassium metal forms potassium hydroxide and releases hydrogen gas along with a large amount of heat when it reacts with water.
K+  H 2 O→KOH +  H 2
The reaction of metallic calcium with water: When calcium reacts with water, it forms calcium hydroxide along with hydrogen gas and heat.
Ca+ 2 H 2 O→Ca (OH) 2  +  H 2
The reaction of metallic magnesium with water: Metallic magnesium reacts slowly with water to form magnesium hydroxide and hydrogen gas.
Mg+ 2 H 2 O→Mg (OH) 2  +  H 2
Thus, metals produce metal hydroxides and hydrogen gas in reaction with cold water.
Hence, the correct option is (3).
 
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