Two substances, A and B were made to react to form a third substance, `A_(2)B` according to the following reaction `2A+B to A_(2)B`.Which of the following statements concerning this reaction are incorrect?
(i) The product `A_(2)B` shows the properties of substances A and B.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.

Options

A. (i), (ii) and (iii)
B. (ii), (iii) and (iv)
C. (i), (iii) and (iv)
D. (ii), (iii) and (iv)

Explanation

To determine which statements concerning the reaction \(2A + B \rightarrow A_2B\) are incorrect, we will analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement:** The product \(A_2B\) shows the properties of substances A and B.

**Analysis:**
- A compound is formed when two or more elements combine chemically. The properties of a compound are usually different from those of its constituent elements.
- Since \(A_2B\) is a compound formed from elements A and B, it will have its own unique properties, distinct from A and B.

**Conclusion:** This statement is **incorrect**.

### Step 2: Analyze Statement (ii)
**Statement:** The product will always have a fixed composition.

**Analysis:**
- According to Dalton's law of constant proportions, a compound has a fixed composition. This means that no matter how much of the elements A and B are used, the ratio in which they combine to form \(A_2B\) will always be the same.
- In this case, \(A_2B\) will always consist of 2 parts A and 1 part B.

**Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement (iii)
**Statement:** The product so formed cannot be classified as a compound.

**Analysis:**
- As established earlier, \(A_2B\) is formed from the chemical reaction between A and B. By definition, a compound is a substance formed from two or more elements combined chemically.
- Since \(A_2B\) is formed from A and B, it is indeed a compound.

**Conclusion:** This statement is **incorrect**.

### Step 4: Analyze Statement (iv)
**Statement:** The product so formed is an element.

**Analysis:**
- An element is a pure substance that cannot be broken down into simpler substances.
- Since \(A_2B\) is a compound formed from A and B, it is not an element. It is a combination of elements, thus it cannot be classified as an element.

**Conclusion:** This statement is **incorrect**.

### Final Summary of Incorrect Statements:
- Statement (i) is incorrect.
- Statement (iii) is incorrect.
- Statement (iv) is incorrect.