General
✓✗Which of the following has the largest size?
- Na
- Na+
- Na−
- Cannot be predicted
General
✓✗Which of the following is a neutral oxide?
- MgO
- SO2
- CO
- CO2
General
✓✗Which of the following ions is isoelectronic with Ne?
- Ca2+
- Cl−
- Na+
- K+
General
✓✗The number of elements in a period of the periodic table equals the number of electrons that can be accommodated in the
- outermost s orbital only
- shell with the same number as the period
- orbitals being filled in that period
- d orbitals of that shell
General
✓✗An element has the first four ionisation enthalpies 800, 2427, 3660 and 25025 kJ mol−1. The number of valence electrons is
- 2
- 3
- 1
- 4
General
✓✗Across a period from left to right, the atomic radius generally
- remains the same
- decreases
- first increases and then decreases
- increases
General
✓✗The most electronegative element is
- oxygen
- fluorine
- chlorine
- nitrogen
General
✓✗The maximum covalency of nitrogen is 4 because
- it has a large atom
- it has no d orbitals in its valence shell
- it is a metal
- it has 8 valence electrons
General
✓✗Lanthanoids are placed separately at the bottom of the periodic table because
- they are radioactive
- they have no electrons in the f subshell
- they are non-metals
- their properties are very similar and they would otherwise make the table too wide
General
✓✗Oxides of metals are generally
- neutral
- acidic
- amphoteric only
- basic
General
✓✗The correct increasing order of the radii of the isoelectronic ions Mg2+, Na+, F− and O2− is
- Na+ < Mg2+ < F− < O2−
- F− < O2− < Mg2+ < Na+
- O2− < F− < Na+ < Mg2+
- Mg2+ < Na+ < F− < O2−
General
✓✗With which of the following electronic configurations does an atom have the lowest ionisation enthalpy?
- 1s2 2s2 2p3
- 1s2 2s2 2p5
- 1s2 2s2 2p5 3s1
- 1s2 2s2 2p6
General
✓✗The correct order of decreasing ionic radii among the following isoelectronic species is
- S2− > Cl− > K+ > Ca2+
- K+ > Ca2+ > Cl− > S2−
- Ca2+ > K+ > S2− > Cl−
- Cl− > S2− > Ca2+ > K+
General
✓✗The common oxidation states of an element with configuration [Ar] 3d1 4s2 are
- +2 and +4
- −3
- +3
- +1
General
✓✗Match List I with List II.
Choose the correct answer from the options given below:
| List I (Block/group in periodic table) | List II (Element) |
| P. Lanthanoid | I. Ce |
| Q. d-block element | II. As |
| R. p-block element | III. Cs |
| S. s-block element | IV. Mn |
- P-I, Q-II, R-IV, S-III
- P-I, Q-IV, R-III, S-II
- P-IV, Q-I, R-II, S-III
- P-I, Q-IV, R-II, S-III