Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020ChemistrySome Basic Concepts of ChemistryPractice

A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with N a 2 C O 3 to precipitate the calcium as calcium carbonate. This C a C O 3 is heated to convert all the calcium to CaO and the final mass of CaO is 1.62 gms. The % by mass of C a C l 2 in the original mixture is

Options

  1. A15.2%
  2. B32.1%
  3. C21.8%
  4. D11.07%

Correct answer

B. 32.1%

Step-by-step solution

Moles = Weight in gm Molecular weight Moles of CaO = 1 .62 56 Moles of C a C l 2 = 1.62 56 Mass of CaCl 2 = 1 .62 56 × 111 = 3 .21 gm Mass %   =   Weight   in   gm Total   weight   given   ×   100 % of C a C l 2 = 3.21 10 × 100 = 32.1 %

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg water I. 2 10⁻⁴ N_A B. 9.8 mg sulphuric acid II. 1.5 10⁻⁴ N_A C. 1.8 mg carbon III. 3 10⁻⁴ N_A 2026Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ⁻¹ of H, He, O and S are 1, 4, 16 and 32 respectively) A. 2 g of O₂ gas B. 4 g of SO₂ gas C. 2026An oxide of iron contains 69.9 % iron, its empirical formula, is: (Given: Molar mass of Fe and O are 56 and 16 g mol ⁻¹ respectively.) 2026What volume of hydrogen gas at STP would be liberated by action of 50 mL of H₂SO₄ of 50 % purity (density = 1.3 g mL ⁻¹ ) on 20 g of zinc ? Given : Molar mass of H, O, S, Zn are 1, 2026How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given: Molar mass of C, O and Ag are 12 , 16 and 108 g mol ⁻¹ respectively) 2026The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is: 2026Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are: 2026The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two carbon atoms. The weight (in g) of CO₂(g) formed when 3.38 g of this hydrocarbon is completely b 2026 Full Some Basic Concepts of Chemistry list All NTA Abhyas JEE Main PYQs