CBSE Class 11 Chemistry Some Basic Concepts Worksheet Set 03

Practice Worksheets for Class 11 Chemistry: Chapter 01 Some Basic Concepts of Chemistry

Explore reliable practice materials for Chapter 01 Some Basic Concepts of Chemistry tailored for Class 11 learners. Utilizing these Chemistry worksheets ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Practice Chapter 01 Some Basic Concepts of Chemistry Worksheets for Class 11 Chemistry

Access the complete worksheet PDF for Chapter 01 Some Basic Concepts of Chemistry below. Regular practice with these targeted questions builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.

SOME BASIC CONCEPTS IN CHEMISTRY
 
I. Multiple Choice Question:
 
1. Which of the following is dependent of temperature?
 
(a) Molarity            (b) Molality           (c) Mole fraction     (d) Mass percentage.
 
2. The number of oxygen atoms in 4.4g of CO2 is approximately-
 
(a) 1.2 × 1023       (b) 6 × 1022         (c) 6 × 1023         (d) 12 × 1023
 
3. What will be the molarity of a solution, which contains 5.85g of NaCl(s) per 500ml.
 
(a) 4 mole/Lit        (b) 20 mole/Lit      (c) 0.2 mole/L       (d) 2mol/Lit
 
4. The empirical formula and molecular mass of a compound are CH2O and 180g respectively. What will be the molecular formula of the compound?
 
(a) C9H18O9         (b) CH2O              (c) C6H12O6        (d) C2H4O2
 
5. A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is:
 
(a) C6H5               (b) C7H8              (c) C2H4              (d) C3H4
 

II. Fill in the Blanks:
 
1. The number of Li atoms in _____________ g. is 6.022×1024 atoms.
 
2.Number of atoms of oxygen in 24 g of O3 is _____________.
 
3.A mixture having 2 g of H2 and 32 g of oxygen occupies a volume of _____________ at NTP.
 
4.The mass of one molecule of carbon dioxide is _____________.
 
5.Number of carbon atoms present in 18 g of glucose (C6H12O6) is ______________.
 
III. ASSERTIONAND REASONINIG QUESTIONS:
 
Directions for Q. No.1-5
 
A If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
 
B If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
 
C If Assertion is true statement but Reason is false.
 
D If both Assertion and Reason are false statements.
 
1. Assertion: A solution of table salt in a glass of water is homogeneous
Reason: A solution having same composition throughout is heterogeneous
 
2. Assertion: The molecular weight of oxygen is 32 amu.
Reason: The atomic weight of oxygen is 16 amu
 
3. Assertion: No of moles of H2 in 0.224 L of hydrogen is 0.01 mole.
Reason: 22.4 L of H2 at STP contain 6.023 × 1023 moles.
 
4. Assertion: Atomic mass of Na is 23.
Reason: An atom of sodium is 23 times heavier than 1/12th mass of C-12 isotope.
 
5. Assertion: Number of atoms of He in 60 u of He is 15.
Reason: Atomic weight of He is 4 u.
 
IV. Descriptive Questions:
 
1. State the following laws:
i) Avogadro’s law
ii) Law of constant proportion
iii) Gay Lussac’s law
 
2. If the density of methanol is 0.793kgl-1 What is its volume needed for making 2.5l of its 0.25 M solution?
 
3. Why do atomic masses of most of the elements in atomic mass unit involve fraction?
 
4. 200ml of 0.05M magnesium chloride is mixed with 75ml of 0.1M silver nitrate solution. Find the number of moles and mass in grams of AgCl formed. What is the limiting reagent?
 
5. 24g of NaOH is dissolved in 300ml water. Calculate the molarity of the solution.
 
6. 4.8g of O2 was used to burn 0.15moles of Fe to Fe2O3. What mass of Fe2O3 was formed?
 
7. (i) What do you understand by the term limiting reagent?
(ii) 6.5g of Zn was reacted with excess of dil. HCl. Calculate the amount and volume of hydrogen produced at STP.
 
8. A compound contains 2.68% Mg. How many atoms of magnesium are present in 15g of the compound?
 
9. Calculate the percentage of (i) copper (ii) Sulphur (iii) Oxygen and (iv) water of hydration in crystalline copper sulphate, CuSO4.5H2O
 
10. 1.8g of an organic compound on combustion gave 2.64g of CO2 and 1.08g of water. Find the empirical formula of the compound.
 
11. In three moles of ethane C2 H6, calculate the following
i) Number of moles of C atoms
ii) Number of moles of Hydrogen atoms
iii) Number of molecules of ethane.
 
12. Calculate the number of atoms and molecules in 224ml of Nitrogen gas at STP.
 
13. Carbon and oxygen combine to give two compounds. The carbon content in one is 42.9% and in the other it is 27.3%. How does this illustrate the law of multiple proportions?
 
14. Commercially available H2SO4 contains 98% acid by mass. Find the molarity if density of the sample is 1.84g/cc. What volume of this acid is required to make 2 L of 0.1 M solution?
 
15. Find the number of atoms of each type in 3.42g of sucrose (C12H22O11).
 
16. How many atoms are there in a) 72 amu of Carbon b) 72 g of carbon?
 
17. How many atoms of hydrogen are there in 51g of ammonia?
 
18. 400 mL each of H2 and O2 are mixed and ignited, find volume of water vapour formed?
 
19. What mass C12 will contain the same number of atoms as in 3.6g of O16?
 
20. Calculate mass of CO2 containing same number of oxygen atoms as in 3g of NO.
 
21. From 0.2g of CO2, 1021 molecules are removed. How many of moles of CO2 remain?
 
22. (i) Define the terms empirical formula and molecular formula.
 
(ii) A hydrocarbon on burning gave 3.38g of CO2 and 0.69g of H2O. 10 L of the gas at STP weighs 11.6g. Find empirical and molecular formula.
 
23. Aqueous magnesium chloride solution is marketed as 20% by mass. Its density is 1.18 g/ml. Calculate
(i) The mole fraction of each component
(ii) Molarity.
(iii) Molality
(iv) The concentration in ppm.
 
24. Define (i) ppm, (ii) molarity, (iii) molality and (iv) mole fraction


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Practice Worksheet and Study Resources for Class 11 Chemistry Chapter 01 Some Basic Concepts of Chemistry

Chapter 01 Some Basic Concepts of Chemistry Printable Worksheet for Class 11 Chemistry

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