Q. No.The general outer electronic configuration of s, p, d , and f-block elements respectively would be :
1.
ns1-2, ns2np1-6, (n-1)d1-10np0-2, (n+2)f1-14(n-1)d0-10ns2
2.
ns1-2, ns2np1-6, (n-1)f1-10ns0-2, (n-2)f1-14nd0-1ns2
3.
ns1-2, ns2np1-6, (n-1)d1-10ns1-2, (n-2)f1-14(n-1)d0-1 ns2
4.
ns1-2, ns2np1-6, (n-1)d1-10ns0-2, (n-2)f1-14(n-2)d0-10ns2
The position of elements with an outer electronic configuration as
1. 6th period and 10th group.
2. 7th period and 3rd group.
3. 6th period and 3rd group.
4. 7th period and 9th group.
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. |
The ionic radii vary in :
| (a) | Inverse proportion to the effective nuclear charge. |
| (b) | Inverse proportion to the square of effective nuclear charge. |
| (c) | Direct proportion to the screening effect. |
| (d) | Direct proportion to the square of screening effect. |
Choose the correct option :
1. (a), (c)
2. (b), (c)
3. (c), (d)
4. (b), (d)
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 |
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