Identify the incorrect match.
|Name||IUPAC Official Name|
|a. Unnilunium||(i) Mendelevium|
|b. Unniltrium||(ii) Lawrecium|
|c. Unnilhexium||(iii) Seaborgium|
|d. Unununnium||(iv) Darmstadtium|
1. (b), (ii)
2. (c), (iii)
3. (d), (iv)
4. (a), (i)
Match the element in column I with that in column II.
|(a) Copper||(i) Non-metal|
|(b) Fluorine||(ii) Transition metal|
|(c) Silicon||(iii) Lanthanoid|
|(d) Cerium||(iv) Metalloid|
For the second period elements, the correct increasing order of first ionisation enthalpy is:
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is , the simplest formula for this compound is :
The formation of the oxide ion O2- (g), from oxygen atom requires first an exothermic and then an endothermic step as shown below,
Thus, process of formation of O2- in gas phase is unfavorable even though O2- is isoelectronic with neon. It is due to the fact that :
1. Electron repulsion outweighs the stability gained by achieving noble gas configuration .
2. ion has comparatively smaller size than oxygen atom.
3. Oxygen is more electronegative.
4. Addition of electron in oxygen result in large size of the ion .
The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase?
1. Ar < K+ < Ca2+
2. Ca2+ < Ar < K+
3. Ca2+ < K+ < Ar
4. K+ < Ar < Ca2+
Which of the following order of ionic radii is correctly represented?
Be2+ is isoelectronic with which of the following ions?
What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?
1. + 10.2 eV
2. –5.1 eV
3. –10.2 eV
4. + 2.55 eV