Which of the following has the same molecular formula and empirical formula

C O_{2}

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C_{6} H_{3} O_{6}

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C_{2} H_{4}

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C_{2} H_{6}

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Solution

The correct option is A $C O_{2}$
In $C O_{2}$ the smallest whole number ratio of atoms is present which represents the empirical formula. Its molecular formula is also the same.
Hence, In $C O_{2}$ empirical formula and molecular formula are same.
In all other cases there is a whole number ratio of atoms which makes its empirical formula different from molecular formula.

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Similar questions

Q. Which of the following statements about molecular and empirical formulas is\ are false?
I. A given compound can have the same, molecular and empirical formula.
II. The molecular formula is a whole number multiple of the empirical formula.
III.

H_{2} O_{2}

represents the empirical formula of hydrogen peroxide.

Q. A compound of relative molecular mass 34 and empirical formula

H O

has the molecular formula :

Q. A compound of relative molecular mass 34 and empirical formula HO has the molecular formula ___________.

Give examples of compounds whose
(a) empirical formula is the same as the molecular formula.
(b) empirical formula is different from the molecular formula.

Which of the following relations represents the correct relationship between empirical formula and molecular formula?

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