Iron is a but carbon dioxide is a _

Solid

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Gas

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Solution

Matter means all material objects ,substances having mass and occupies space.
States of matter are Solid and Liquid and Gas.
Solid is a state of matter that has definite shape and fixed volume and distinct boundaries .Iron piece is such an example of solid.
Gas is a state of matter that has neither a fixed volume nor definite on its own .Carbon dioxide is an example of gas.

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Iron is a ______ but carbon dioxide is a _______

Iron is a but carbon dioxide is a _