With explanation, please.
Answers
Answer:
Answer is option B
Explanation:
The melting point is the temperature where the solid turns into liquid. The boiling point is the temperature where the liquid further changes into a gas. In between these temperatures if the state is liquid, the substance will remain liquid until it crosses the boiling point. Same is the case for every state.
Substance P has melting point of -114 degrees. This means that it has been converted into liquid at room temperature, which is +30 degrees. So 1st statement is false.
Substance Q has a boiling point of -196 degrees. This means that it has been converted into a gas at room temperature, which is +30 degrees. So 2nd statement is also false.
Substance R has a boiling point of +360 degrees and a melting point of -40 degrees. This means it is neither a gas at +150 degrees nor a solid at +220 degrees. So 3rd statement is also false.
Substance S has a melting point of +330 degrees. This means that it a solid at room temperature. So 4th statement is true.
Hence, the correct answer is option B.
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