ANCQ

I have a question. This was given in ANCQ this year. Please help me out. Tell me the correct answer.

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

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Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.
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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

Please help me its urgent.....

Sai Ram - 4 years, 9 months ago

Andrea Palma - 4 years, 7 months ago

procedure ?

Sai Ram - 4 years, 7 months ago

Every material exists in liquid state exatly when its temperature is BETWEEN its melting point and its boiling point. Now -140°C is between -169 and -104 so the ethene at -140°C is in liquid state. -140°C is also between -185 and -48 so the propene at -140°C is also liquid. Same for pentene. The butene at -140°C is solid because -140°C is BELOW its melting point -138. So exactly 3 substances are liquid at -140°(, while the butene is solid at -140°C.

Andrea Palma - 4 years, 7 months ago

@Andrea Palma – Thanks..!!

Sai Ram - 4 years, 6 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$