Q. No.Incorrect statement among the following is-
1) Elements are classified into periods and groups
2) Elements with similar properties are placed in the same group
3) This makes the study of elements simpler
4) Elements are placed according to decreasing atomic number
The maximum number of elements that can be accommodated in the sixth period are :
1. 8
2. 18
3. 32
4 16
The element named after Lawrence Berkeley Laboratory is:
1. Seaborgium
2. Lawrencium
3. Moscovium
4. Hafnium
Boron has lesser ionization enthalpy than Beryllium, because:
| 1. | It is easier to remove electrons from p - a subshell than a filled s - subshell. |
| 2. | The s-electron can be removed easier than the p-electron. |
| 3. | Ionization enthalpy decreases with an increase in atomic number. |
| 4. | Ionization enthalpy increases along the period. |
Difference between electron gain enthalphy and electronegativity is described by :
| 1. | Valence electrons | 2. | Atomic size |
| 3. | Atomic radii | 4. | Atomic number |
Incorrect statement about metal is:
1. Metals can donate electrons.
2. Metals form ionic compounds.
3. Metals are more electronegative.
4. Metals have less ionization energy.
Which group contains elements that exist as a non-metal, liquid, and gas at room temperature?
| 1. | 15 | 2. | 14 |
| 3. | 18 | 4. | 17 |
| Elements | |||
| I | 520 | 7300 | -60 |
| II | 419 | 3051 | -48 |
| III | 1681 | 3374 | -328 |
| IV | 1008 | 1846 | -295 |
| V | 2372 | 5251 | +48 |
| VI | 738 | 1451 | -40 |
1. III
2. IV
3. II
4. V
Incorrect statement among the following is:
| 1. | The p-block has 6 columns because a maximum of 6 electrons can occupy all the orbitals in a p-shell. |
| 2. | The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in a d-subshell. |
| 3. | Each block contains a number of columns equal to the number of electrons that can occupy that subshell. |
| 4. | The s- block contains mainly reactive metals. |
Ionic radii vary with respect to the following factors:
a. Inversely proportional to the effective nuclear charge.
b. Directly proportion to the effective nuclear charge.
c. Directly proportional to the screening effect.
d. Inversely proportional to the screening effect.
Which of the following pairs of statements is/are correct?
1. a, c
2. c, d
3. a, b
4. c, d
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