ICSE Class 10 Chemical Bonding and Molecular Structure — Mock Test (2027)

Free online mock test for Chemical Bonding and Molecular Structure (ICSE Class 10 Chemistry) — 92 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.Consider the following statements about molecular orbital theory: (1) The number of molecular orbitals formed equals the number of combining atomic orbitals. (2) A bonding molecular orbital has lower energy and greater stability than the corresponding antibonding molecular orbital. (3) For a stable molecule the number of electrons in antibonding orbitals must exceed those in bonding orbitals. (4) If one or more molecular orbitals are singly occupied, the substance is paramagnetic. How many of the above statements are correct?
   • A.One
   • B.Two
   • C.Three
   • D.Four
2. 2.Which one of the following statements about the steps for writing Lewis dot structures is NOT correct?
   • A.For an anion, one electron is added to the total for each unit of negative charge
   • B.For a cation, one electron is subtracted from the total for each unit of positive charge
   • C.In general the most electronegative atom occupies the central position in the molecule or ion
   • D.After accounting for single bonds, the remaining electron pairs are used for multiple bonds or remain as lone pairs
3. 3.Isoelectronic species N2, CO and NO+ all have the same bond order. What is that bond order?
   • A.3
   • B.1
   • C.2
   • D.2.5
4. 4.How many valence electrons are represented by the Lewis dot symbol of nitrogen?
   • A.Five
   • B.Three
   • C.Seven
   • D.Two
5. 5.Which property is best explained by molecular orbital theory but NOT by valence bond theory or the Lewis approach?
   • A.The paramagnetism of the O2 molecule
   • B.The tetrahedral shape of CH4
   • C.The bond angle in H2O
   • D.The ionic character of NaCl