ICSE Class 10 Mole Concept and Stoichiometry — Mock Test (2027)

Free online mock test for Mole Concept and Stoichiometry (ICSE Class 10 Chemistry) — 20 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.Determine the molecular formula of a compound with the following percentage composition:

   Element	%	At. wt.	Relative no. of atoms	Simplest ratio
   C	52.17	12	4.34	2
   H	13.04	1	13.04	6
   O	34.78	16	2.17	1

   Empirical formula: C₂H₆O Empirical formula weight: 46 Molecular weight: 46
   • A.C₂H₆O
   • B.C₄H₁₂O₂
   • C.CH₃O
   • D.C₃H₈O
2. 2.The number of atoms present in one molecule of an element is called its :
   • a.Molecular number
   • b.Atomic number
   • c.Atomicity
   • d.Avogadro's number
3. 3.A compound of elements X and Y has the empirical formula XY₂. If its vapour density equals its empirical formula weight, what is its molecular formula?
   • A.XY₂
   • B.X₂Y₄
   • C.X₃Y₆
   • D.X₂Y₂
4. 4.$$\mathrm{MnO_2} + 4\mathrm{HCl} \rightarrow \mathrm{MnCl_2} + 2\mathrm{H_2O} + \mathrm{Cl_2}$$. 0·02 moles of pure $\mathrm{MnO_2}$ is heated strongly with conc. HCl. Calculate: (a) mass of $\mathrm{MnO_2}$ used, (b) moles of salt formed, (c) mass of salt formed, (d) moles of chlorine gas formed, (e) mass of chlorine gas formed, (f) volume of chlorine gas formed at STP, (g) moles of acid required, (h) mass of acid required.
5. 5.(a) Calculate the volume of oxygen at STP required for the complete combustion of 100 litres of carbon monoxide at the same temperature and pressure. $$2 \mathrm{CO} + \mathrm{O}_2 \rightarrow 2 \mathrm{CO}_2$$ (b) 200 cm³ of hydrogen and 150 cm³ of oxygen are mixed and ignited. What volume of oxygen remains unreacted? $$2 \mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2\mathrm{O}$$