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Question

Two substances, A and B were made to react to form a third substance, A2B according to the following reaction:
2A+BA2B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B 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


A

(i), (ii) and (iii)

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B

(ii), (iii) and (iv)

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C

(i), (iii) and (iv)

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D

(ii), (iii) and (iv)

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Solution

The correct option is C

(i), (iii) and (iv)


Pure substances:

  1. It is made up of only one kind of atom.
  2. A pure material cannot be divided into different types of matter by physical processes.
  3. Elements: It is made up of a single type of atom which can't be broken further. Example: Argon (Ar).
  4. Compound: It is a pure substance made up of two or more elements chemically combines with one another in a fixed proportion by mass. Example: Sodium hydroxide(NaOH).

The explanation for correct options:

The product A2B shows the properties of substances A and B:

The properties of a compound (e.g., A2B) are entirely different from those of its constituent elements (i.e., A and B).

The product so formed cannot be classified as a compound:

A2B is a compound made up of two elements A and B in a fixed ratio.

2A + B → A2B

The product so formed is an element:

The product formed i.e. is a compound.

Since all the above statements are not true about the product formed thus option (c) is correct.

The explanation for incorrect options:

The product will always have a fixed composition:

  1. A2B is a compound made up of two elements A and B in a fixed ratio.
  2. The composition of a compound is fixed.

Since the above statement is true about the compound A2B thus option (a), (b) and (d) are incorrect.

Hence option (c) is the correct option.


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