ICSE Class 10 Some Basic Concepts of Chemistry — Mock Test

Free online mock test for Some Basic Concepts of Chemistry (ICSE Class 10 Chemistry) — 104 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1. 1.How many atoms of hydrogen are present in 2 mol of ammonia (NH3)? (Avogadro number = 6.022 x 10^23 per mol)
   • A.1.2044 x 10^24 atoms
   • B.6.022 x 10^23 atoms
   • C.3.6132 x 10^24 atoms
   • D.1.8066 x 10^24 atoms
2. 2.Two volumes of hydrogen combine with one volume of oxygen to give two volumes of water vapour, with no unreacted oxygen. Avogadro could explain this only by assuming that:
   • A.Hydrogen and oxygen molecules are polyatomic (diatomic)
   • B.Atoms of the same kind always combine
   • C.Equal volumes contain unequal numbers of molecules
   • D.Water vapour is monatomic
3. 3.In the equation CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g), the coefficients 2 for O2 and H2O are called:
   • A.Stoichiometric coefficients
   • B.Subscripts
   • C.Mole fractions
   • D.Significant figures
4. 4.Using the data 35Cl (abundance 75.77%, molar mass 34.9689) and 37Cl (abundance 24.23%, molar mass 36.9659), the average atomic mass of chlorine is closest to:
   • A.35.45
   • B.36.00
   • C.34.97
   • D.35.97
5. 5.Match each law with its proponent: (i) Conservation of Mass (ii) Definite Proportions (iii) Multiple Proportions (iv) Law of Gaseous Volumes. Which option pairs them correctly with Lavoisier, Proust, Dalton, Gay Lussac respectively?
   • A.(i)-Lavoisier, (ii)-Proust, (iii)-Dalton, (iv)-Gay Lussac
   • B.(i)-Proust, (ii)-Lavoisier, (iii)-Gay Lussac, (iv)-Dalton
   • C.(i)-Dalton, (ii)-Gay Lussac, (iii)-Lavoisier, (iv)-Proust
   • D.(i)-Gay Lussac, (ii)-Dalton, (iii)-Proust, (iv)-Lavoisier