Structural units of ice and dry ice are, respectively.

$H_{2} O, C O$

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$H_{2} O, C O_{2}$

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$C O_{2}, H_{2} O$

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$C O, C O_{2}$

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Solution

The correct option is B
$H_{2} O, C O_{2}$

Ice is the solid form of water.
Structural unit $⟶$ $H_{2} O$
Dry ice is solid form of carbon dioxide.
Structural unit $⟶$ $C O_{2}$

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Structural units of ice and dry ice are, respectively.

The correct option is B H2O,CO2 Ice is the solid form of water. Structural unit ⟶ H2O Dry ice is solid form of carbon dioxide. Structural unit ⟶ CO2

The correct option is B
$H_{2} O, C O_{2}$

Ice is the solid form of water.
Structural unit $⟶$ $H_{2} O$
Dry ice is solid form of carbon dioxide.
Structural unit $⟶$ $C O_{2}$