Some Basic Concepts of Chemistry

10 solved questions from Class 11 Chemistry, each with the full working. Tap any question to see the step-by-step solution.

• 1 What is the primary chemical reaction or bonding mechanism highlighted in 'Some Basic Concepts of Chemistry' (Class 11)? medium MCQ Reaction Mechanism & Bonding
• 2 What factor affects the rate or equilibrium constant of reactions in 'Some Basic Concepts of Chemistry'? medium MCQ Chemical Kinetics & Factors
• 3 Which functional group or IUPAC nomenclature rule applies to compounds in 'Some Basic Concepts of Chemistry'? medium MCQ IUPAC Nomenclature & Structure
• 4 What is the major product obtained in the characteristic reaction of 'Some Basic Concepts of Chemistry'? medium MCQ Reaction Products & Selectivity
• 5 Which of the following subatomic particles is found inside the nucleus of a hydrogen atom? easy MCQ 1 mark Atomic structure
• 6 According to Bohr’s model, the radius of the first excited state (n = 2) of the hydrogen atom is given by r_n = n^2 a_0, where a_0 = 0.529 × 10^-10,m is the Bohr radius. Calculate r_2 in meters. hard 3 marks Atomic structure (Bohr model)
• 7 Element X has two naturally occurring isotopes. Isotope A (mass 140 u) has an abundance of 75 % and isotope B (mass 141 u) has an abundance of 25 %. Calculate the average atomic mass of element X. hard 3 marks Atomic mass (isotopes)
• 8 In the reaction 2 Al + 3 Cl₂ → 2 AlCl₃, if 0.50 mol of aluminium reacts with excess chlorine, calculate the mass of aluminium trichloride produced. hard 4 marks Stoichiometric calculation of product mass
• 9 Which of the following subatomic particles is found inside the nucleus of a hydrogen atom? easy MCQ 1 mark Subatomic particles in nucleus
• 10 Element Y has two naturally occurring isotopes: isotope A with mass 40 u and abundance 60 %, and isotope B with mass 41 u and abundance 40 %. Calculate the average atomic mass of element Y. medium 2 marks Average atomic mass of isotopes