Inorganic Chemistry Part I Quiz Batch 08 1 / 70Which scientist explained the phenomenon of electromagnetic waves Maxwell Hertz Newton Hygens 2 / 70Which phenomenon cannot be explained by the wave nature of light? Diffraction Interference Photoelectric effect Polarization 3 / 70The photoelectric effect is the phenomenon in which: Light is scattered by small particles Electrons are emitted from a metal surface when light falls on it Light bends around obstacles Light splits into different colors 4 / 70Who explained the photoelectric effect using quantum theory Newton Hugens Maxwell Einstein 5 / 70The minimum energy required to remove an electron from a metal surface is called Kinetic energy Work function Potential energy Threshold frequency 6 / 70If the intensity of incident light increases, what happens to the number of photoelectrons emitted increased decreased remains constant stops completly 7 / 70Line spectra are produced due to Continuous radiation from a hot body Absorption of light by a medium Excited atoms emitting specific wavelengths of light Scattering of light by small particles 8 / 70The spectral lines in hydrogen's emission spectrum are grouped into different series. The series in the visible region is called Lyman series Balmer series Paschen series Brackett series 9 / 70The line spectrum of an element is Unique for each element The same for all elements A continuous spectrum Independent of the element’s structure 10 / 70Which scientist explained the hydrogen spectrum using the quantum model? Newton Bohr Einstein Maxwell 11 / 70The energy levels of an electron in a hydrogen atom are given by which equation? En=−13.6/n2 eV En=−13.6/n eV En=−n/ 13.6 eV none 12 / 70What is the energy of an electron in the first (ground) state of a hydrogen atom? -13.3 eV 13.3eV -3.4 eV 3.4 eV 13 / 70When an electron jumps from a higher energy level to a lower one, it: Absorbs a photon Emits a photon Gains energy Remains in the same state 14 / 70What is the principal quantum number (n) for the first excited state of a hydrogen atom? 0 1 2 3 15 / 70When an electron moves from n=3n=3n=3 to n=2n=2n=2, it emits a photon in which spectral series? Lyman Balmer series Brackett series pfund series 16 / 70The lowest possible energy state of an electron in an atom is called: excited state valence state ground state Ionized state 17 / 70According to Bohr’s model, electrons in an atom move in Spiral orbits Elliptical orbits Stationary circular orbits Random paths 18 / 70The angular momentum of an electron in Bohr’s model is quantized and given by L=nh L=nh2 L=nh3 L=n2hL=n2h 19 / 70Which postulate of Bohr’s model explains the stability of an atom Electrons move in quantized orbits without radiating energy Electrons continuously lose energy and spiral into the nucleus Energy levels are non-quantized Electrons jump randomly between orbits 20 / 70The radius of the first Bohr orbit (n=1) in hydrogen is approximately: 0.53 nm 1.06nm 2.03nm 0.78nm 21 / 70Bohr’s model was successful in explaining Hydrogen spectrum only All atomic spectra The structure of all elements Quantum mechanics 22 / 70Heisenberg’s Uncertainty Principle states that Position and velocity of a particle can be measured simultaneously with infinite precision Position and momentum of a particle cannot be measured simultaneously with absolute precision Energy and mass of a particle cannot be measured simultaneously Time and distance of a particle cannot be measured simultaneously 23 / 70The uncertainty principle is a fundamental concept in Classical mechanics Newtonian physics Quantum mechanics Electromagnetism 24 / 70Which of the following is a direct consequence of the uncertainty principle? The exact path of an electron cannot be determined The speed of light changes in different media Particles do not have mass The energy of an atom remains constant 25 / 70What is the minimum uncertainty in the momentum of a particle if its position uncertainty is zero zero infinite equal to mass Cannot be determined 26 / 70Quantum numbers describe The energy levels in an atom The shape and orientation of orbitals The spin of electrons all of above 27 / 70The principal quantum number (nnn) determines: The shape and orientation of orbitals enery levels The spin of the electron The number of electrons in an atom 28 / 70Which quantum number represents the orientation of orbitals n l m s 29 / 70The principal quantum number (nnn) can have values: Any integer Any positive integer Any real number even numbers only 30 / 70. If n=3, what are the possible values of l 0, 1, 2, 3 0, 1, 2 1, 2, 3 -3 to +3 31 / 70If l=2 what are the possible values of ml -2, -1, 0, +1, +2 0, 1, 2 -1, 0, +1 -3 to +3 32 / 70The quantum numbers n=4,l=2n = 4, l = 2n=4,l=2 correspond to which subshell 4s 3d 4d 4p 33 / 70Which set of quantum numbers is not valid n=3,l=2,ml=−2,ms=+1/2 n=2,l=2,ml=0,ms=−1/2 n=4,l=3,ml=+2,ms=−1/2 all are correct 34 / 70The number of orbitals in a given subshell is determined by n 2l+1 l ml 35 / 70The total number of orbitals in the third energy level (n=3n=3n=3) is 3 4 9 7 36 / 70What is the maximum number of electrons that can fit in the n=5 energy level 32 50 100 125 37 / 70Builiding up rule is called aufbau rule pauli's exclusion Hund's rule Heinsenberg rule 38 / 70. A vessel contains a mixture of 2 moles of hydrogen gas, 3 moles of oxygen gas, and 5 moles of nitrogen gas at a total pressure of 10 atm. What is the partial pressure of oxygen gas 2atm 3atm 5atm 10atm 39 / 70A real gas behaves most ideally at High temperature and high pressure High temperature and low pressure Low temperature and high pressure Low temperature and low pressure 40 / 70The compressibility factor (Z) for an ideal gas is Always greater than 1 Always less than 1 Always equal to 1 Can be greater or less than 1 41 / 70Why does a hot air balloon rise? The air inside the balloon becomes denser The heated air inside the balloon expands and becomes less dense The external pressure decreases The number of air molecules inside the balloon increases 42 / 70The boiling point of a liquid: Decreases with decreasing external pressure Increases with decreasing external pressure Remains constant at all altitudes Is independent of external pressure 43 / 70Why does sweating cool the body Water molecules absorb heat and condense Evaporation of sweat absorbs heat from the skin The body stops producing heat The body absorbs heat from the surroundings The body absorbs heat from the surroundings 44 / 70Which of the following liquids would have the highest boiling point water ethanol methanol acetone 45 / 70Which factor directly affects the rate of evaporation? Size of the container color of the liquid Volume of the liquid Strength of intermolecular forces 46 / 70What is the pOH of a solution with a pH of 3? 3 7 11 14 47 / 70If the pH of a solution increases from 5 to 7, how does the [H⁺] concentration change Increases by 100 times decreases by 100 times Increases by 10 times decreases by 10 times 48 / 70What is the pH of a 0.01 M HCl solution? 1 2 3 4 49 / 70A buffer solution contains A strong acid and its salt A weak acid and its conjugate base A strong base and a strong acid A strong base and its conjugate acid 50 / 70A weak acid is one that Completely dissociates in water Partially dissociates in water Does not ionize at all Is always neutral in solution 51 / 70The autoionization constant of water (Kw) at 25°C is: 1 × 10⁻¹⁴ 1 × 10⁻⁷ 1 × 10⁻¹² 1 × 10⁻¹⁶ 52 / 70The pH of a buffer solution depends on The concentration of acid only The pKa of the acid and the ratio of base to acid The amount of water added The strength of the base 53 / 70A buffer solution is most effective when The pH = pKa The pH = 7 The base is much greater than the acid The acid is much greater than the base 54 / 70Which of the following is a Brønsted-Lowry base? NH₃ HCl HNO₃ H2SO4 55 / 70What does SHAB stand for in acid-base concepts? Strong-Hard Acid-Base Solvent-Hard Acid-Base Soft-Hard Acid-Base Super-Hard Acid-Base 56 / 70According to SHAB theory, which of the following is a hard acid? Ag⁺ Fe³⁺ Pt²⁺ I2 57 / 70According to SHAB theory, which type of interactions are most stable Hard acid with hard base Hard acid with soft base Soft acid with hard base Random interactions 58 / 70The Usanovich concept is considered the most general because it includes Only Arrhenius and Bronsted-Lowry theories Only Lewis theory All other acid-base concepts including oxidation-reduction reactions Only acid-base neutralization reactions 59 / 70Which of the following best describes a base in the Usanovich concept An electron donor An electron acceptor A proton donor A molecule that increases hydrogen ion concentration 60 / 70Which of the following has the lowest pH? Baking soda solution pure milk water lemon juice 61 / 70The pH of human blood is normally around 2.5 5.5 7.4 8.3 62 / 70The pH of a buffer solution is calculated using Henderson-Hasselbalch equation Arrhenius equation Nernst equation Boyle’s law 63 / 70What will happen if a small amount of HCl is added to an acidic buffer The pH will drop drastically The pH will remain nearly the same The solution will turn basic The buffer will be destroyed immediately 64 / 70Which of the following acids has the highest acid dissociation constant (Ka) HCl HF H2SO4 HNO₃ 65 / 70Which of the following elements does NOT follow the octet rule in its common compounds C B O Ne 66 / 70Which of the following is NOT a strong acid? HCl HNO3 H2SO4 H3PO4 67 / 70Which noble gas can form stable compounds by violating the octet rule He Kr Ne Xe 68 / 70How many valence electrons are present in the Lewis structure of NO₃⁻ (nitrate ion)22 22 24 26 32 69 / 70Which scientist's work led to the discovery of the lanthanide and actinide series Glenn Seaborg Henry Moseley Antoine Lavoisier Rutherford 70 / 70Chalcogen group is O family N family Li family C family Your score isThe average score is 64% 0% Restart quiz
