Which of the following is a correct chemical reaction of calcium with water?

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$Ca + 2 H_{2} O \to Ca {(OH)}_{2} + O_{2}$

$Ca + 2 H_{2} O \to Ca {(OH)}_{2} + H_{2} O_{2}$

$Ca + 2 H_{2} O \to Ca {(OH)}_{2} + H_{2}$

$Ca + 2 H_{2} O \to Ca {(OH)}_{2} + H_{2} O$

answer is A.

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Detailed Solution

Calcium is a silvery-white metal with a hardness that is substantially greater than that of sodium metal. Alkaline-earth metals, or Group II on the periodic table, include calcium. These metals react with water aggressively, albeit not as severely as Group I metals like salt or potassium. Calcium metal's reaction with water - Calcium metal responds less forcefully when it reacts with water. The hydrogen gas bubbles created by this process adhere to the surface of calcium to form calcium hydroxide, a hazy, white precipitate. It floats on the water's surface as a result. This reaction generates a lot less heat, which prevents the hydrogen gas from igniting.

Calcium reacts with water to form calcium hydroxide with the release of hydrogen gas.

$Ca + 2 H_{2} O \to Ca {(OH)}_{2} + H_{2}$

Stoichiometry of the reaction: Calcium hydroxide and hydrogen gas are produced when 1 mole of calcium combines with 2 moles of water.
Thus, we may draw the conclusion that calcium reacting with water will result in the development of calcium hydroxide and hydrogen gas, which can be distinguished from one another by the formation of bubbles for hydrogen gas and hazy white precipitate for calcium hydroxide, respectively.

Hence, the correct answer is A.

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