An element X combines with hydrogen to form a compound `XH_(3)`. The element X is placed on the right side of the periodic table. What is true about the element X?
I. It has 2 valence electrons.
II It is a metal and is solid.
III. It is a non-metal and is a gas.
IV. it has 5 valence electrons
V. `XH_(3)` reacts with water to form a basic compound

Options

A. I, II and III
B. II, III and IV
C. III, IV and V
D. V, I and II

Explanation

To determine the properties of the element X that combines with hydrogen to form the compound XH₃, we can analyze the information given step by step.

### Step 1: Identify the Valency of Element X
The compound XH₃ indicates that the valency of element X is 3. This is because hydrogen has a valency of 1, and when combining, we use the criss-cross method to balance the charges. Therefore, X must have a valency of 3.

**Hint:** Remember that the valency of an element indicates how many electrons it can gain, lose, or share when forming compounds.

### Step 2: Determine the Position of Element X in the Periodic Table
The question states that element X is placed on the right side of the periodic table. Elements on the right side are typically non-metals.

**Hint:** Recall that non-metals are found on the right side of the periodic table and usually have higher electronegativities.

### Step 3: Analyze the Valence Electrons of Element X
Since element X has a valency of 3 and is a non-metal, it is likely to have 5 valence electrons (as non-metals tend to gain electrons). This is characteristic of elements in Group 15 of the periodic table.

**Hint:** Non-metals in Group 15 have 5 valence electrons, which corresponds to their ability to form compounds like XH₃.

### Step 4: Classify Element X as a Metal or Non-Metal
Given that element X is located on the right side of the periodic table and has a valency of 3, it is classified as a non-metal. Non-metals can exist in various states, but many are gases at room temperature.

**Hint:** Non-metals can be gases, liquids, or solids, but many of the lighter non-metals (like nitrogen) are gases.

### Step 5: Evaluate the Reaction of XH₃ with Water
When XH₃ reacts with water, it is expected to form a basic compound. For example, if X is nitrogen (which fits our criteria), the reaction would produce ammonium hydroxide (NH₄OH), a basic compound.

**Hint:** Consider how compounds formed from non-metals can react with water to produce acids or bases.

### Conclusion
Based on the analysis:
- Statement I: False (It has 5 valence electrons, not 2)
- Statement II: False (It is a non-metal, not a metal)
- Statement III: True (It is a non-metal and can be a gas)
- Statement IV: True (It has 5 valence electrons)
- Statement V: True (XH₃ reacts with water to form a basic compound)

Thus, the true statements about element X are III, IV, and V.

### Final Answer
The true statements about the element X are:
- III. It is a non-metal and is a gas.
- IV. It has 5 valence electrons.
- V. XH₃ reacts with water to form a basic compound.