Question

Which of the following is not correct?

(1) XeO2 is a colorless explosive gas
(2) SO2 is highly soluble in water
(3) Noble gases have very low boiling points
(4) The boiling point of sulphur is more than that of oxygen

• A. XeO$_2$ is a colourless explosive gas
• B. SO$_2$ is highly soluble in water
• C. Noble gases have very low boiling points
• D. The boiling point of sulphur is more than that of oxygen

Hint:

When verifying properties of gases and elements, remember to consider both their chemical reactivity and physical properties, such as color and boiling points.

Answer 1

The Correct Option is A

Let's analyze the given options:

Option 1: XeO₂ is a colourless explosive gas – This statement is incorrect. Xenon dioxide (XeO₂) is indeed an explosive compound, but it is not colourless; it has a yellowish hue. Hence, this statement is false.

Option 2: SO₂ is highly soluble in water – This is correct. Sulfur dioxide (SO₂) is highly soluble in water, where it forms sulfurous acid (H₂SO₃).

Option 3: Noble gases have very low boiling points – This is true. Noble gases like helium, neon, and argon have very low boiling points due to their monatomic and non-polar nature.

Option 4: The boiling point of sulfur is more than that of oxygen – This is true. The boiling point of sulfur is 444.6 K, whereas oxygen boils at 90.19 K. Thus, the statement in Option 1 is not correct.