Ionisation Enthalpy Trend in Group 13 Elements
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Questions and Answers

What health effects can occur when the concentration of ozone rises above 100 parts per million?

  • Dizziness and fatigue
  • Skin irritation
  • Headache and nausea (correct)
  • Coughing and shortness of breath

Which element from Group 17 is noted as being fairly abundant?

  • Bromine
  • Iodine
  • Astatine
  • Fluorine (correct)

What type of bond results in the paramagnetism of S2 molecules?

  • Metallic bond
  • Ionic bond
  • Covalent bond (correct)
  • Hydrogen bond

Which gas combines very rapidly with ozone according to experiments mentioned?

<p>Nitrogen (B)</p> Signup and view all the answers

Where are small quantities of fluorine found apart from minerals like fluorspar and cryolite?

<p>River water (A)</p> Signup and view all the answers

Which compound makes up the main component of sea water?

<p>Sodium chloride (D)</p> Signup and view all the answers

What is the chemical formula of fluoroapatite as mentioned in the text?

<p>$3Ca_3(PO_4)_2.CaF_2$ (B)</p> Signup and view all the answers

Which element in Group 17 is mentioned as less abundant than fluorine?

<p>Iodine (C)</p> Signup and view all the answers

Which statement about the iodine oxides is correct?

<p>They are insoluble solids and decompose upon heating. (A)</p> Signup and view all the answers

What is the purpose of aqua regia, formed by mixing concentrated HCl and HNO3?

<p>It is used for dissolving noble metals like gold and platinum. (C)</p> Signup and view all the answers

Which trend is correct for the ionization enthalpy of Group 18 elements?

<p>He &gt; Ne &gt; Ar &gt; Kr &gt; Xe &gt; Rn (A)</p> Signup and view all the answers

Which statement about the boiling points of noble gases is correct?

<p>They have low boiling points due to weak dispersion forces. (C)</p> Signup and view all the answers

Which compound is formed by the partial hydrolysis of XeF6?

<p>XeOF4 and XeO2F2 (D)</p> Signup and view all the answers

Which binary fluoride of xenon is formed by the direct reaction of elements?

<p>XeF2, XeF4, and XeF6 (A)</p> Signup and view all the answers

What is the trend for the electron gain enthalpy of Group 18 elements?

<p>Ne &gt; Ar = Kr &gt; Xe &gt; Rn &gt; He (A)</p> Signup and view all the answers

Which element from Group 18 has the lowest boiling point among all known substances?

<p>Helium (A)</p> Signup and view all the answers

Which property of helium is mentioned in the text?

<p>It can diffuse through commonly used laboratory materials. (A)</p> Signup and view all the answers

What is the trend for the atomic radius of Group 18 elements?

<p>He &lt; Ne &lt; Ar &lt; Kr &lt; Xe &lt; Rn (C)</p> Signup and view all the answers

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