ICSE Class 10 Classification of Elements and Periodicity in Properties — Mock Test

Free online mock test for Classification of Elements and Periodicity in Properties (ICSE Class 10 Chemistry) — 87 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.Among the second period elements, why does beryllium have a higher first ionization enthalpy than boron?
   • A.Beryllium loses a 2s-electron which penetrates and is attracted to the nucleus more than the 2p-electron lost by boron.
   • B.Beryllium has a greater nuclear charge than boron.
   • C.Boron has a completely filled 2p subshell.
   • D.Beryllium is a metal while boron is a non-metal.
2. 2.The lanthanoid series corresponds to the filling of which orbitals and spans which atomic numbers?
   • A.4f orbitals, Ce (58) to Lu (71)
   • B.5f orbitals, Th (90) to Lr (103)
   • C.3d orbitals, Sc (21) to Zn (30)
   • D.5d orbitals, La (57) to Hg (80)
3. 3.The electron gain enthalpy of fluorine is less negative than that of chlorine. This is best explained by the fact that:
   • A.the small size of F means the added electron enters the compact n=2 level and suffers large repulsion from electrons already present
   • B.chlorine has a higher nuclear charge than fluorine
   • C.fluorine has a larger atomic radius than chlorine
   • D.chlorine has a half-filled 3p subshell
4. 4.Helium is placed in the p-block (Group 18) rather than the s-block because:
   • A.it has a completely filled valence shell (1s2) like other noble gases
   • B.it has an incomplete valence shell
   • C.it readily gains electrons
   • D.its valence electron is in a p-orbital
5. 5.In the long form of the Periodic Table, the period number corresponds to the highest value of which quantum number of the elements in that period?
   • A.principal quantum number (n)
   • B.azimuthal quantum number (l)
   • C.magnetic quantum number (m)
   • D.spin quantum number (s)