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Which pure substance can be classified as an element?

A. [tex]\( H_2 \)[/tex]
B. [tex]\( NO_3 \)[/tex]
C. NaCl
D. [tex]\( H_2SO_4 \)[/tex]

Sagot :

GinnyAnsweridn
Sure, let's analyze the substances given and determine which one can be classified as an element.

1. [tex]\(H_2\)[/tex]

- [tex]\(H_2\)[/tex] (hydrogen gas) consists of two hydrogen atoms bonded together. Since it is made up of only one type of atom, it is classified as a pure element.

2. [tex]\(NO_3\)[/tex]

- [tex]\(NO_3\)[/tex] is the nitrate ion, which contains nitrogen and oxygen atoms. Since it is composed of more than one type of atom, it is classified as a compound, not an element.

3. NaCl

- Sodium chloride (table salt) is composed of sodium (Na) and chlorine (Cl) atoms. This makes it a compound because it involves more than one type of element.

4. [tex]\(H_2SO_4\)[/tex]

- Sulfuric acid ([tex]\(H_2SO_4\)[/tex]) is composed of hydrogen, sulfur, and oxygen atoms. Since it involves multiple types of elements, it is also a compound.

Given this analysis, the pure substance that can be classified as an element is [tex]\(H_2\)[/tex].

Thus, the correct answer is:
[tex]\[ \boxed{1} \][/tex]

[tex]\(H_2\)[/tex] is the only pure substance in the given list that can be classified as an element.
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