Q. No.
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?
1. F < Cl < O < S
2. S < O < Cl < F
3. O < S < F < Cl
4. Cl < F < S < O
The ions O2–, F–, Na+, Mg2+, and Al3+ are isoelectronic. Their ionic radii show:
| 1. | A significant increase from O2– to Al3+. |
| 2. | A significant decrease from O2– to Al3+. |
| 3. | An increase from O2– to F– and then a decrease from Na+ to Al3+. |
| 4. | A decrease from O2– to F– and then an increase from Na+ to Al3+. |
The period and group number of the element with Z =114 are:
| 1. | 8th period and 16th group | 2. | 7th period and 14th group |
| 3. | 14th period and 7th group | 4. | 9th group and 14th period |
The trend of atomic radius in a period and a group is :
| 1. | Generally decreases from right to left across a period and increases down a group. |
| 2. | Generally increases from left to right across a period and decreases down a group. |
| 3. | Generally decreases from left to right across a period and increases down a group. |
| 4. | Generally remains same from left to right across a period and increases down a group. |
An element with higher negative electron gain enthalpy in the given pair is:
(i) O or F (ii) F or Cl
1. O, Cl
2. F, F
3. O, F
4. F, Cl
The basic difference between the electron gain enthalpy (Ea) and electronegativity (EN) is:
| 1. | Ea is the tendency to lose electrons, while EN is the tendency to repel the shared pairs of electrons. |
| 2. | Ea is the tendency to gain neutrons, while EN is the tendency to attract the shared pairs of electrons. |
| 3. | Ea is the tendency to donate electrons, while EN is the tendency to attract the shared pairs of molecules. |
| 4. | Ea is the tendency to gain electrons, while EN is the tendency to attract the shared pairs of electrons. |
The statement that "the electronegativity of N on the Pauling scale is 3.0 in all the nitrogen compounds" is incorrect because:
| 1. | Electronegativity of an element is a variable property. |
| 2. | Pauling scale is not used to measure electronegativity. |
| 3. | The electronegativity of N on the Pauling scale is 12.0 |
| 4. | None of the above. |
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 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
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