Chemistry is defined as the branch of science that studies the composition, structure, and properties of matter, as well as the changes that matter undergoes under various conditions and the laws that govern these changes.
Chemistry, as fundamental science, is used in every aspect of a person’s life, from the food consumed to the products used. The advancement of chemical science has altered the foundation of current medicine. Marvel drugs such as penicillin and streptomycin have been developed as a result of ongoing chemistry research.
Download PDF of Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry– Set 1
CBSE Class 11 Chemistry Worksheet Chapter 1 Some Basic Concepts of Chemistry – Set 1
Q1. At the same temperature and pressure, an equal volume of gases contains the same number of ____.
a.) Molecules
b.) Electrons
c.) Protons
d.) Particles
Q2. The gas law that relates the volume of a gas to the number of molecules of the gas is ____.
a.) Gay–Lussac’s law
b.) Avogadro’s law
c.) Boyle’s law
d.) Charle’s law
Q3. The mass % of carbon in CO2 is ____.
a.) 0.034%
b.) 27.27%
c.) 3.4%
d.) 28.7%
Q4. The empirical formula of benzene is ____.
a.) CH
b.) C6H6
c.) C3H3
d.) C2H2
Q5. What is the mole fraction of the solute in a 1.00 molal aqueous solution?
a.) 0.00177
b.) 0.0344
c.) 0.0177
d.) 0.1770
Q6. State the number of significant figures in each of the following numbers:
i.) 207.35
ii.) 0.00368
iii.) 653
iv.) 3.63 × 104
v.) 0.378
Q7. What are the laws of chemical combination?
Q8. What are the applications of Avogadro’s law?
Q9. Calculate the number of Cl– ions in 100ml of 0.001 M HCl solution.
Q10. Perform the following calculations and express the results to the proper number of significant figures:
i.) 144.3m2 + (254 m × 8.4 m)
ii.) (4.05 × 102 mL) – (0.0225 × 102 mL)
iii.) (3.50 × 102 cm) (4.00× 106 cm)
Q11. Write the balanced chemical equations for the following reactions:
i.) Manganese dioxide and concentrated hydrochloric acid.
ii.) Sodium thiosulphate and iodine.
iii.) Copper and dilute nitric acid.
iv.) Sulphur dioxide and hydrogen sulphide.
Q12. Will the molarity of a solution at 50℃ be the same, less or more than the molarity at 25℃?
Q13. Boron occurs in nature in the form of two isotopes having atomic mass 10 and 11. What are the percentage abundances of two isotopes in a sample of boron having an average atomic mass of 10.8?
Q14. How is mole related to the following?
i.) Mass
ii.) Volume
iii.) The number of molecules of a substance
Q15. What is cheaper?
40% HCl at the rate of ₹6 per kg or 80% H2SO4 at the rate of ₹3.5 per kg required to neutralise 7 kg of KOH.
Q16. A tennis ball was observed to travel at a speed of 96 miles per hour. Calculate the speed of the ball in metres per second.
Q17. Write short notes on
i.) Limiting reagent
ii.) Avogadro hypothesis
iii.) Dalton’s atomic theory
Q18. Carbon and oxygen are known to form two compounds. The carbon content in one of these compounds is 42.9%, while in the other, it is 27.3%. Show that the data are in agreement with the law of multiple proportions.
Q19. Balance the following equations by partial equation method:
i.) NaOH + Cl2 → NaCl + NaClO3 + H2O
ii.) C + H2SO4 → CO2 + SO2 + H2O
iii.) P4 + HNO3 → H3PO4 + NO2 + H2O
Q20.
Butyric acid contains only C, H, and O. A 4.24 mg sample of butyric acid is completely burnt. It gives 8.45 mg of carbon dioxide and 3.46 mg of water.
a.) What is the mass percentage of each element in butyric acid?
b.) Determine its empirical formula.
c.) The molecular mass of butyric acid was determined by the experiment to be 88𝜇. What is the molecular formula?
Download PDF to access answers of the Chemistry Worksheet for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry Set – 1.
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Read Also:
- Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry MCQs
- Important Questions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry
- Chemistry Concept Questions and Answers
- CBSE Class 11 Chemistry Practical
- Significant Figures Chemistry
- Laws of Chemical Combination for Elements and Compounds
- Mole Concept
- Empirical Formula & Molecular Formula
