Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them
Noble gases have large positive values of electron gain enthalpy
Noble gases are sparingly soluble in water
Noble gases have very high melting and boiling points
Noble gases have weak dispersion forces
The Correct Option is C
Solution and Explanation
Noble gases, also known as inert gases, are a group of chemical elements with very low reactivity due to their complete valence electron shells. Let's evaluate each option to identify the incorrect statement about noble gases:
- Noble gases have large positive values of electron gain enthalpy: This statement is correct. Noble gases have full valence electron shells, making it energetically unfavorable to add an extra electron. Therefore, they exhibit high electron gain enthalpy, reflecting their reluctance to gain electrons.
- Noble gases are sparingly soluble in water: This statement is correct. Due to their non-polar and inert nature, noble gases do not dissolve well in polar solvents like water, hence they are sparingly soluble.
- Noble gases have very high melting and boiling points: This statement is incorrect. Noble gases have very low melting and boiling points due to their atomic nature and weak Van der Waals forces (dispersion forces) between atoms, which require minimal energy to overcome.
- Noble gases have weak dispersion forces: This statement is correct. The interactions between noble gas atoms are mainly through weak Van der Waals dispersion forces because they are monoatomic and non-polar, leading to low melting and boiling points.
Thus, the incorrect statement is: "Noble gases have very high melting and boiling points."
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Concepts Used:
Classification of Elements & Periodicity in Properties
Since many elements were being discovered in the 19th century and the study of these elements individually was proving difficult, classification of elements was made necessary.
Classification by Johann Dobereiner - German chemist Johann Dobereiner classified certain elements on the basis of their similar properties in the groups of continuing - three elements each. These groups were called ‘triads’. In every triad, the atomic weight of the middle element was equal to the average of the atomic weights of the first and third elements.
Newlands Law of Octaves - The elements were arranged in increasing order of their atomic weights and found that every 8th element shows similarity with the 1st element.
Mendeleev’s Periodic Table - The arrangement of all 63 elements in rows or columns in order of their atomic weight was made by Mendeleev. He left some space for corresponding elements in his periodic table which were not even discovered till then. Although he predicted the properties of those elements through his periodic classification of elements.
Modern Periodic Law - The properties of the elements of the modern periodic law are periodic functions of their atomic numbers.