A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X :

Calcium oxide

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Magnesium oxide

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Beryllium oxide

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Barium oxide

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Solution

The correct option is A Calcium oxide
Substance X is calcium oxide $(C a O)$ , also known as quicklime. It is an important ingredient in the processing of cement. Calcium oxide reacts with water to form calcium hydroxide $C a (O H)_{2}$ which is a base and therefore, turns red litmus blue. The equation can be written as:
$2 C a O (s) + H_{2} O (l) \to C a (O H)_{2} (a q)$

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Similar questions

Q. Question 32
A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Q. An element X that react with oxygen and form an oxide

X_{2} O

. This oxide dissolves in water and turns red litmus blue. Element

X

is :

An element reacts with oxygen to form oxide which dissolve in dilute hydrochloric acid.the oxide formed turns a solution of red litmus blue. Is the element a metal or a nonmetal? Explain with an example.

An element X on reacting with oxygen forms an oxide X₂O. This oxide dissolves in water and turns red litmus blue. State whether element X is a metal or a non metal. Explain with proper example.

The element Z burns in air to form an oxide.The aqueous solution of this oxide turns blue litmus to red.

(a) carbon

(b) calcium

(d) magnesium

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