| Chapter-3: Classification of Elements and Periodicity in Properties |
1. Which of the following has the highest boiling point?
- Ne
- Xe
- Ar
- Kr.
[su_spoiler title=”Answer ” style=”fancy”] Xe [/su_spoiler]
2. Which of the following has the maximum number of unpaired electrons?
- Mg2+
- Ti3+
- V3+
- Fe2+
[su_spoiler title=”Answer ” style=”fancy”] Fe2+ [/su_spoiler]
3. Representative elements are those which belong to
- p and d – Block
- s and d – Block
- s and p – Block
- s and f – Block
[su_spoiler title=”Answer ” style=”fancy”] s and p – Block [/su_spoiler]
4. The most electronegative element of the periodic table is
- Iodine
- Sulphur
- Oxygen
- Fluorine.
[su_spoiler title=”Answer ” style=”fancy”] Fluorine. [/su_spoiler]
5. In the periodic table, the element with atomic number 16 will be placed in the group
- Third
- Fourth
- Fifth
- Sixth
[su_spoiler title=”Answer ” style=”fancy”] Sixth [/su_spoiler]
6. In the third period of the Periodic Table the element having smallest size is
- Na
- Ar
- Cl
- Si
[su_spoiler title=”Answer ” style=”fancy”] Ar [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] Elements with atomic no. 17 and 53 [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] 15, 5 and 3 [/su_spoiler]
9. The element with highest second ionization energy is
- Cl
- S
- Na
- Mg
[su_spoiler title=”Answer ” style=”fancy”] Na [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] The ratio of their charge and size is nearly the same [/su_spoiler]
11. Which of the following oxides is amphoteric in character?
- SnO2
- CO2
- SiO2
- CaO
[su_spoiler title=”Answer ” style=”fancy”] SnO2 [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] atomic numbers [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] Many metals with catalytic properties [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] 15, 5 and 3 [/su_spoiler]
15. Which of the following properties generally decreases along a period?
- Ionization Energy
- Metallic Character
- Electron Affinity
- Valency.
[su_spoiler title=”Answer ” style=”fancy”] Metallic Character [/su_spoiler]