The plasma state occurs when

solids are frozen
gases are heated
solids are melted
liquids are boiled

Option (b) is the correct answer.

Explanation:

Plasma is defined as the state of matter which is a hot ionized gas consists of positively charged ions and negatively charged electron.

For example, neon is a plasma as it is a gas that contains charged particles.

So, when a gas is further heated then a stage reaches where it becomes ionized and hence it then changes into plasma state.

Thus, we can conclude that the plasma state occurs when gases are heated.

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