Chapter-3: Classification of Elements and Periodicity in Properties |
1. Which of the following has the highest boiling point?
- Ne
- Xe
- Ar
- Kr.
2. Which of the following has the maximum number of unpaired electrons?
- Mg2+
- Ti3+
- V3+
- Fe2+
3. Representative elements are those which belong to
- p and d – Block
- s and d – Block
- s and p – Block
- s and f – Block
4. The most electronegative element of the periodic table is
- Iodine
- Sulphur
- Oxygen
- Fluorine.
5. In the periodic table, the element with atomic number 16 will be placed in the group
- Third
- Fourth
- Fifth
- Sixth
6. In the third period of the Periodic Table the element having smallest size is
- Na
- Ar
- Cl
- Si
7. Which pair of elements belongs to same group?
- Elements with atomic no. 17 and 38
- Elements with atomic no. 20 and 40
- Elements with atomic no. 17 and 53
- Elements with atomic no. 11 and 33
8. The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:
- 16, 5 and 2
- 15, 5 and 3
- 16, 6 and 3
- 15, 6 and 2
9. The element with highest second ionization energy is
- Cl
- S
- Na
- Mg
10. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:
- Both are found together in nature
- Both have nearly the same size
- Both have similar electronic configuration
- The ratio of their charge and size is nearly the same
11. Which of the following oxides is amphoteric in character?
- SnO2
- CO2
- SiO2
- CaO
12. According to the periodic law of elements, the variation in properties of elements is related to their
- nuclear neutron
- atomic masses
- nuclear masses
- atomic numbers
13. The d-block elements consists mostly of
- Monovalent metals
- All non-metals
- Elements which generally form stoichiometric metal oxide
- Many metals with catalytic properties
14. The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are:
- 16, 5 and 2
- 15, 5 and 3
- 16, 6 and 3
- 15, 6 and 2
15. Which of the following properties generally decreases along a period?
- Ionization Energy
- Metallic Character
- Electron Affinity
- Valency.