Question

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 valence electrons

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. A, B and C
• B. B, C and D
• C. C, D and E
• D. E, A and B

Answer 1

The correct option is C

C, D and E

X reacts with hydrogen to form $X{H}_3$ compound, X is present on the right side, so it is a non-metal. The valency of hydrogen is 1, and the valency of X will be 3. $X{H}_3$ reacts with water to form a basic compound.
X is Nitrogen(2,5) which is on the right side of periodic table and react with hydrogen to form $N{H}_3$ , X(N) has 5 valence electrons.
$N{H}_3$ reacts with water to form basic compound

$N{H}_3+H_{2}O\to N{H}_{4}OH\left(Base\right)$

NOTE:

If you think that element is Aluminium, Aluminium hydride gives amphoteric acids.