Q. No.The first ionization potential of Be and B will be:
1. 8.8 and 8.8
2. 6.6 and 6.6
3. 6.6 and 8.8
4. 8.8. and 6.6
1. 8.8 and 8.8
2. 6.6 and 6.6
3. 6.6 and 8.8
4. 8.8. and 6.6
An electronic configuration that has maximum difference between II and III ionization potential is:
1. 1s2 2s2 2p6 3s1
2. 1s2 2s2 2p6 3s2
3. 1s2 2s2 2p6
4. 1s2 2s2 2p5
Incorrect order among the following is:
| 1. | NH3 < PH3 < AsH3 – Acidic |
| 2. | Li < Be < B < C – Ist Ionization potential |
| 3. | Al2O3 < MgO < Na2O < K2O - Basic |
| 4. | Li+ < Na+ < K+ < Cs+ - Ionic radius |
If an atom has electronic configuration 1s22s22p63s23p63d34s2, we will place it in group number:
| 1. | Fifth | 2. | Fifteenth |
| 3. | Second | 4. | Third |
The correct order of IP(ionization potential) among the following elements Be, B, C, N, O is:
| 1. | B < Be < C < O < N | 2. | B < Be < C < N < O |
| 3. | Be < B < C < N < O | 4. | Be < B < C < O < N |
The basic theme of the periodic table is:
| 1. | To classify the elements in a period according to their properties. |
| 2. | To classify the elements in a group according to their ionization enthalpy. |
| 3. | To classify the elements in periods and groups according to their properties. |
| 4. | To classify the elements in periods and groups according to their lustre. |
Property used by Mendeleev to classify the elements was:
1. Brightness
2. Atomic weight or mass
3. Number of isotopes
4. Lustre
The basic difference between Mendeleev’s Periodic Law (A) and Modern Periodic Law (B) is:
| 1. | A is based on atomic weights while B is based on atomic numbers. |
| 2. | B is based on atomic weights while A is based on atomic numbers. |
| 3. | A is based on the number of isotopes while B is based on atomic numbers. |
| 4. | A is based on physical properties while B is based on chemical properties. |
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 |
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