Which of the following is a linear molecule?

H_{2} O

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H_{2} O_{2}

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D_{2} O

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N_{2} O

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Solution

The correct option is D $N_{2} O$
The shape of various molecules are given below:

$H_{2} O$ has a tetrahedral shape due to two $O - H$ bonds and two lone pair of electrons on oxygen.

$H_{2} O_{2}$ is bent-shaped.

$D_{2} O$ also has a tetrahedral shape. $D$ is an isotope of hydrogen.

$N_{2} O$ is linear-shaped because lone pairs present in it is delocalised due to resonance of electrons.

Hence, the linear molecule is $N_{2} O$ .

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