CBSE Class 11 Chemistry Basic Concepts Of Chemistry Important Questions

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Study Material for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

Class 11 Chemistry students should refer to the following Pdf for Chapter 1 Some Basic Concepts of Chemistry in Class 11. These notes and test paper with questions and answers for Class 11 Chemistry will be very useful for exams and help you to score good marks

Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

CBSE Class 11 Chemistry Basic Concepts Of Chemistry Important Questions

1 MARK QUESTIONS:

  1. Round up the following upto three significant figures:
  2. i) 35.296 ii) 12.2104
  3. Why are the atomic masses of most of the elements fractional?
  4. How many significant figures are present in the answer of following calculation: 5×1.35×1.1? (Ans: Two significant figures)

2 MARK QUESTIONS:

  1. How many significant figures are present in the following: i) 0.0020 ii) 1.20x104  
  2. Calculate the mass percent of different elements present in nitric acid.  (Ans : H = 1.59%, N = 22.22%, O = 76.19% )
  3. 4L of dinitrogen reacted with 22.7L of dioxygen and 45.4L of nitrous oxide was formed. The reaction is given below: 2N2 (g) + O2(g) à 2N2O(g). Which law is obeyed in this statement? Write the statement of this law.
  4. Which out of molality and molarity is preferred for expressing the concentration of solution and why?
  5. Chlorine is prepared in the laboratory by treating MnO2 with aqueous HCl solution according to the reaction: 4HCl (aq) + MnO2(s) à 2H2O (l) + MnCl2(aq) + Cl2(g) , how many grams of HCl react with 5.0g of MnO2. (Atomic mass of Mn = 55u, Cl = 35.5u, O = 16u) (Ans: 8.40g)
  6. Naphthalene ball contains 93.71% of carbon and 6.29% of hydrogen . If its molar mass is 128g/mol, calculate its molecular formula. (Ans: C10H8)

3 MARK QUESTIONS:

  1. 3 molal NaOH solution has a density of 1.110g/mL. What is the molarity of the solution? (Ans: 2.973 M)
  2. Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41g/L and the mass percent of HNO3 in it being 69%. (Ans: 15.44 M)
  3. 50 Kg of N2 (g) and 8.0 Kg of H2 (g) are mixed to produce NH3 (g). Calculate the amount of NH3 (g) formed. Identify the limiting reagent in the production of NH3 in the given situation. (At.mass in g/mol ,N=14, H=1) (Ans: H2 is the limiting reagent, Mass of NH3 formed = 56.217 kg)
  4. Calculate the number of atoms in each of the following: i) 39 moles of He ii) 39 u of He iii) 39g of He (Ans i) 2.35 × 1025 ii) 9.75 iii) 5.87×1024)
  5. A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38g CO2 , 6.690g H2O and no other products. A volume of 10.0L (at STP) of this welding gas is found to weigh 11.6g. Calculate i) Molar mass of the gas ii) Molecular formula of the gas.  (Ans: i) 26g/mol ii) C2H2
  6. Two oxides of a metal contain 27.6% and 30.0% of oxygen respectively. If the formula of the first oxide is M3O4, find that of the second. (Ans: M2O3)
  7. A crystalline salt when heated becomes anhydrous and loses 51.2% of its weight. The anhydrous salt on analysis gave the percentage composition as: Mg = 20.0%, S = 26.66% and O = 53.33%. Calculate the molecular formula of the anhydrous salt and crystalline salt. Molecular mass of the anhydrous salt is 120u. (Ans: MgSO4.7H2O)
  8. An organic compound has carbon=40.687%, hydrogen=5.085%, oxygen=54.228%. Calculate molecular formula of the compound if its vapour density is 59. (Ans: C4H6O4)
  9. If the elemental composition of butyric acid is found to be 54.2% C, 9.2% H and 36.6% O. What will be its molecular formula if its molecular mass is 88 u? (Ans: C4H8O2)
  10. Calculate i) number of moles ii) no. of molecules iii) volume of gas at STP in 0.28g of nitrogen. (Ans: i) 0.01 mole ii) 6.022×1021 molecules iii) 0.227 L
  11. In the reaction: 2A+4B à 3C+4D, when 5 moles of A react with 6 moles of B, then
    1. Which is the limiting reagent?
    2. Calculate the amount of C formed. (Ans: i) B ii) 4.5 moles)

HOTS:

  1. Gastric juice contains about 3.0g of HCl per litre. If a person produces about 2.5 litres of gastric juice per day, how many antacid tablets each containing 400mg of Al(OH)3 are needed to neutralize all the HCl produced in one day? (3 marks) (Ans: 14 tablets) 
  2. What volume of 0.1M NaOH solution is required to neutralise 100 ml of concentrated aqueous sulphuric acid which contains 98% H2SO4 by mass. The density of concentrated sulphuric acid solution is 1.84g/ml. (Atomic mass of H=1u, S=32u, O=16u, Na=23u). (3 marks)(Ans: 36.76 L) 
  3. Calcium carbonate reacts with aqueous HCl to give CaCl2 and CO2 according to the reaction: CaCO3(s) + 2HCl(aq) à CaCl2(aq) + CO2(g) + H2O(l). How many moles and how many grams of CaCl2 will be formed when 250mL of 0.76 M HCl reacts with 1000g of CaCO3 ? Name the limiting reagent also. ( Atomic Masses: Ca = 40u, Cl = 35.5u) (3 marks)

(Ans: HCl is the limiting reagent, CaCl2 formed = 0.095 mol = 10.54g)

VALUE BASED QUESTION:

  1. In 2015, some samples of maggi were found to contain compounds of lead so Govt. banned it for some time and also there is a check on the sale of junk food in school canteen. But still kids are very fond of Pizza, Pasta, and Burger etc. After reading news paper and other articles, Riya, a student of DPS decided not to eat junk food and to switch over to fresh fruits and homemade food only.
    1. What are the harmful effects of eating junk food? 
    2. What are the values associated with Riya?
Chapter 04 Chemical Bonding and Molecular Structure
Class 11 Chemistry Chemical Bonding and Molecular Structure Exam Questions

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