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Q.

Chemical formula of sulphur trioxide is


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a

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>SO</mi><mn>3</mn></msub></math>

b

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>SO</mi><mn>2</mn></msub></math>

c

None of the above 

d

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></math>

answer is A.

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Detailed Solution

Concept- A chemical formula is a way to present the identification of a chemical compound and its information about the chemical ratios of the atoms that make up the whole molecule.
Sulphur trioxide is a covalent compound and thus its name suggests that it is an oxide of sulphur atom. Trioxide means there are three oxygen atoms.
Therefore, <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>SO</mi><mn>3</mn></msub></math> represents the chemical formula of sulphur trioxide. The structure of sulphur trioxide has three S=O bonds.
<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>SO</mi><mn>2</mn></msub></math> is the chemical formula of sulphur dioxide and <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></math> represents hydrogen sulphide.
Hence, the correct answer is 1.
 
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