Q. No.Among the following, the elements that can show covalency greater than 4 is/are:
(a) Be
(b) P
(c) S
(d) B
Choose the correct option
1. (a), (d)
2. (b), (c)
3. (c), (d)
4. (b), (d)
In which following options of arrangement does not agree with the variation of the property indicated against it?
| (a) | Al3+< Mg2+< Na+< F– (Increasing ionic size) |
| (b) | B < C < N (Increasing atomic size) |
| (c) | I < Br < Cl (Increasing atomic size) |
| (d) | Li < Na < K (Metallic character) |
Choose the correct option
| 1. | (a), (d) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (b), (d) |
The properties among the following can be shown by the element belonging
to the 3rd period and group 13 of the periodic table:
(a) Good conductor of electricity
(b) Liquid, metallic
(c) Solid, metallic
(d) Solid, non-metallic
Choose the correct option :
1. (a), (c)
2. (b), (c)
3. (c), (d)
4. (b), (d)
The element having a greatest difference between its first and second ionization energies, is:
1. Ca
2. Sc
3. K
4. Ba
The oxidation state and covalency of Al in [AlCl(H2O)5]2+ are respectively:
1. +3 and 3
2. +6 and 2
3. +3 and 6
4. +2 and 2
The correct representation of the first ionization enthalpy for
Ca, Ba, S, Se, and Ar in increasing order, among the following, is:
1. Ba < Ca < Se < S < Ar
2. Ca < Ba < S < Se < Ar
3. Ca < S < Ba < Se < Ar
4. S < Se < Ca < Ba < Ar
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 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 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 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. |
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