An element $X$ combines with hydrogen to form a compound $X H_{3}$ . The element $X$ is placed on the right side of the periodic table. What is true about the element $X$ ?
A. Has 3 valency
B. Is a metal and is solid.
C. Is a non-metal and is a gas.
D. Has 5 valence electrons.
E $X H_{3}$ reacts with water to form a basic compound.

A, B and C

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A, C and D

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C, D and E

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E, A and B

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Solution

The correct option is D E, A and B
An element X combines with hydrogen to form a compound $X H_{3}$ . The element X is placed on the right side of the periodic table. The element $X$ can be aluminium. It belongs to group IIIA or 13.

As the electronic configuration of Al is 2,8,3.
A. Has 3 valency.
B. Is a metal and is solid.
E $A l H_{3}$ reacts with water to form a basic compound $A l (O H)_{3}$ .
$A l H_{3} + 3 H_{2} O \to A l (O H)_{3} + 3 H_{2}$

The statements E, A, and B are true.

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