MCQs For NCERT Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

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Please refer to the MCQ Questions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry with Answers. The following Some Basic Concepts of Chemistry Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.

Some Basic Concepts of Chemistry Class 11 MCQ Questions with Answers

See below Some Basic Concepts of Chemistry Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. The maximum number of molecules are present in
(a) 15 L of H₂ gas at STP
(b) 5 L of N₂ gas at STP
(c) 0.5 g of H₂ gas
(d) 10 g of O₂ gas

Question. The number of water molecules in 250 mL of water is closest to [Given, density of water is 1.0 g mL^–1; Avogadro’s number = 6.023 × 10²³]
(a) 83.6 × 10²³
(b) 13.9 × 10²³
(c) 1.5 × 10²³
(d) 33.6 × 10²³

Question. A metal oxide has the formula Z₂O₃. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The tomic weight of the metal is   
(a) 27.9
(b) 159.6
(c) 79.8
(d) 55.8

Question. Number of moles of MnO₄– required to oxidize one mole of ferrous oxalate completely in acidic medium will be
(a) 0.6 moles
(b) 0.4 moles
(c) 7.5 moles
(d) 0.2 moles

Question. A metallic chloride contain 47.22% metal. Calculate the equivalent weight of metal.
(a) 39.68
(b) 31.76
(c) 36.35
(d) 33.46

Question. 10 g CaCO₃ were dissolved in 250 mL of 100 M HCl or the solution was boiled. What volume of 2M KOH would be required to equivalence point after boiling? Assume no change in olume during boiling.
(a) 50 mL
(b) 25 mL
(c) 75 mL
(d) 60 mL

Question. The density of 3M solution of sodium chloride is 1.252 g mL^–1. The molality of the solution will be : (molar mass, NaCl = 58.5 g mol^–1)
(a) 260 m
(b) 2.18 m
(c) 2.79 m
(d) 3.00 m

Question. 2 g of a mixture of CO and CO₂ on reaction with excess I₂O₅ produced 2.54 g of I₂. What would be the mass % of CO₂ in the original mixture?
(a) 60
(b) 30
(c) 70
(d) 35

Question. 3.0 g of oxalic acid [(CO₂H)₂.2H₂O] is dissolved in a solvent to prepare a 250 mL solution. The density of the solution is 1.9 g/mL. The molality and normality of the solution, espectively, are closest to
(a) 0.10 and 0.38
(b) 0.10 and 0.19
(c) 0.05 and 0.19
(d) 0.05 and 0.09

Question. How many moles of P4O6 and P₄O₁₀ will be produced by the combustion of 12.4 g of phosphorous (atomic mass 31) in 12.8 g of oxygen, leaving no P₄ or O₂?
(a) 0.1 and 0.3 mol
(b) 0.15 mol and 0.25 mol
(c) 0.05 mol each
(d) 0.1 mol each

Question. The number of moles of water present in a spherical water droplet of radius 1.0 cm is [Given: density of water in the droplet = 1.0 g cm^–3]
(a) π /18
(b) 2π /27
(c) 24π
(d) 2π /9

Question. If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K =39)
(a) 153.12 g of KClO₃
(b) 122.5 g of KClO₃
(c) 245 g of KClO₃
(d) 98 g of KClO₃

Question. 5 g sample contain only Na₂CO₃ and Na₂SO₄. This sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M H₂SO₄. Calculate the of Na₂SO₄ in the sample.
(a) 42.4
(b) 57.6
(c) 36.2
(d) 0.576

Question. The dimensions of pressure are the same as that of                                       
(a) force per unit volume
(b) energy per unit volume
(c) force
(d) energy

Question. Given the numbers : 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers is                                   
(a) 3, 3 and 4 respectively
(b) 3, 4 and 4 respectively
(c) 3, 4 and 5 respectively
(d) 3, 3 and 3 respectively.

Question. Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27 °C in identical conditions. The ratio of the volumes of gases H₂ : O₂ : methane  ould be                                         
(a) 8 : 16 : 1
(b) 16 : 8 : 1
(c) 16 : 1 : 2
(d) 8 : 1 : 2 

Question. What volume of oxygen gas (O₂) measured at 0°C and 1 atm, is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions?                             
(a) 5 L
(b) 10 L
(c) 7 L
(d) 6 L 

Question. 0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance? (Density of H₂ = 0.089 g/L)                                         
(a) 95.93
(b) 59.93
(c) 95.39
(d) 5.993

Question. 1 mole of equimolar mixture of ferric oxalate and ferrous oxalate requires x mole of KMnO₄ in acidic medium for complete oxidation. x is:   
(a) 0.5 mole
(b) 0.9 mole
(c) 1.2 mole
(d) 4.5 mole

Question. Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final ixture?   
(a) 2.70 M
(b) 1.344 M
(c) 1.50 M
(d) 1.20 M

Question. The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15°C and 150 mmHg pressure, one litre of O2 contains ‘N’ molecules. The number of molecules in two litres of  O₂ under the same conditions of temperature and pressure will be                                     
(a) N/2
(b) N
(c) 2 N
(d) 4 N 

Question. What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?                         
(a) 2.8 kg
(b) 6.4 kg
(c) 9.6 kg
(d) 96 kg 

Question. An element, X has the following isotopic composition : 200X : 90% 199X : 8.0% 202X : 2.0% The weighted average atomic mass of the naturally occurring element X is closest to                     

(a) 201 amu
(b) 202 amu
(c) 199 amu
(d) 200 amu 

Question. Boron has two stable isotopes, 10B(19%) and 11B(81%). Calculate average at. wt. of boron in the periodic table.                                     
(a) 10.8
(b) 10.2
(c) 11.2
(d) 10.0 

Question. Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ weighs 10 g and 0.05 mole of X₃Y₂ weighs 9 g, the atomic weights of X and Y  re                                                     
(a) 40, 30
(b) 60, 40
(c) 20, 30
(d) 30, 20 

Question. If Avogadro number NA, is changed from 6.022 × 10²³ mol^–1 to 6.022 × 10²⁰ mol^–1, this would change     
(a) the mass of one mole of carbon
(b) the ratio of chemical species to each other in a balanced equation
(c) the ratio of elements to each other in a compound
(d) the definition of mass in units of grams. 

Question. The number of water molecules is maximum in                                             
(a) 1.8 gram of water
(b) 18 gram of water
(c) 18 moles of water
(d) 18 molecules of water.

Question. A mixture of gases contains H₂ and O₂ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?                                               
(a) 16 : 1
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1 

Question. Which one of the followings has maximum number of atoms?                                     
(a) 1 g of Ag_(s) [Atomic mass of Ag = 108]
(b) 1 g of Mg_(s) [Atomic mass of Mg = 24]
(c) 1 g of O_2(g) [Atomic mass of O = 16]
(d) 1 g of Li_(s) [Atomic mass of Li = 7]

Question. In which case is number of molecules of water maximum?                                   
(a) 18 mL of water
(b) 0.18 g of water
(c) 0.00224 L of water vapours at 1 atm and 273 K
(d) 10–3 mol of water 

Class 11 Chemistry Chapter 1 MCQ Questions with Answers will assist the student with understanding the chapter in a great way. Besides, these MCQs will fill in as the best revision materials during the class 11 board exam. Aside from Class 11 Some Basic Concepts of Chemistry MCQ, we have also provided Revision Notes and sample papers to assist students with ably planning for the board exam.

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