1st (∆H1) and 2nd (∆H2) Ionization Enthalpies (in kJ mol–1) and the (∆egH) Electron Gain Enthalpy (in kJ mol–1) of a few elements are given below:
Elements | ΔH1 | ΔH2 | ΔegH |
I | 520 | 7300 | –60 |
II | 419 | 3051 | –48 |
III | 1681 | 3374 | –328 |
IV | 1008 | 1846 | –295 |
V | 2372 | 5251 | +48 |
VI | 738 | 1451 | –40 |
The most reactive metal is:
1. | VI | 2. | III |
3. | I | 4. | II |
The formula of the stable binary compounds that would be formed by an element having atomic number 71 and fluorine:
1. LuF6
2. LuF2
3. LuF3
4. LuF4
The factor that does not affect the valence electron is:
1. | Azimuthal quantum number |
2. | Nuclear charge (Z) |
3. | Nuclear mass |
4. | Number of core electrons |
The size of isoelectronic species: F–, Ne and Na+, is affected by :
1. | Nuclear charge (Z) |
2. | Valence principal quantum number (n) |
3. | Electron-electron interaction in the outer orbitals |
4. | None of the above factors because their size is the same |
The incorrect statement about ionization enthalpy is:
1. | Ionization enthalpy increases for each successive electron. |
2. | Noble gases have the highest ionization enthalpy. |
3. | A big jump in ionization enthalpy indicates a stable configuration. |
4. | Ionization enthalpy of oxygen is higher than that of nitrogen. |
Match the following isoelectronic species in Column I and Column II:
Column I | Column II | ||
i. | a. | ||
ii. | Ar | b. | |
iii. | c. | ||
iv. | d. |
i | ii | iii | iv | |
1. | b | c | a | d |
2. | c | b | a | d |
3. | c | d | b | a |
4. | b | c | d | a |
The correct order of ionization energy of W, X, Y and Z is-
1. | W > X > Y > Z | 2. | W < X < Y > Z |
3. | W < X > Y< Z | 4. | W > X > Y< Z |
Consider the following curve:
X represents group with highest atomic radius. The element that belongs to Y group can be :
1. | Na | 2. | Mg |
3. | Br | 4. | Si |
In the following graph of variation of ionization energy with atomic number, X, Y, and Z represent elements.
The group number of X, Y, and Z elements is:
1. | 1st group | 2. | 15th group |
3. | 17th group | 4. | 18th group |
The graph between ionization energy and atomic number for
the first group elements is shown below:
The element represented by Y in the graph above is -
1. Cs
2. Rb
3. Ca
4. K