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Atomicity

Which of the ...

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Which of the following statements are true?
(i) An element consists of only one type of particles.
(ii) $H_{2} O$ is a compound.
(iii) Two or more elements chemically combined in a fixed proportion to form a compound.
(iv) NaCl is an element.

A) i, ii, and iii
B) i and iii
C) ii and iv

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Q. Two chemical substances X and Y combine together to form a product P which contains both X and Y

X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?

(i) P is a compound
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(a) (i), (ii) and (iii)
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Q. A compound is a substance composed of two or more different types of elements chemically combined in a fixed proportion.

Q. Mark the correct statement:

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Q. Question 8
Two substances, A and B were made to react to form a third substance,

A_{2} B

according to the following reaction

2 A + B \to A_{2} B

. Which of the following statements concerning this reaction are incorrect?
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(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
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(c) (i), (iii) and (iv)
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A substance that is composed of two or more elements, chemically combined with one another in a fixed proportion is called a ____.

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