JEE Main Classification of Elements and Periodicity — practice questions
36 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Classification of Elements and Periodicity in the app →The modern periodic law states that the physical and chemical properties of elements are periodic functions ofElements of the modern periodic table are classified into how many blocks based on the differentiating electroAcross a period from left to right, the atomic radius generally:Which element has the highest first ionization energy in period 2?Which of the following arrangements is in correct order of increasing electronegativity (Pauling scale)?The element with electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^3$ belongs to which group Rutherford's alpha-particle scattering experiment led to the conclusion that the atom:According to Bohr's postulate, the angular momentum of an electron in the $n$-th allowed orbit of a hydrogen-lThe radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:The total energy of an electron in the $n$-th orbit of a hydrogen atom is given by $E_n = -13.6/n^2\,\text{eV}The minimum energy required to remove an electron from the ground state of a hydrogen atom is:The kinetic energy of an electron in the $n$-th Bohr orbit of a hydrogen atom is related to its total energy $The Rydberg formula for the wavelength of radiation emitted when an electron in a hydrogen atom jumps from levWhich spectral series of hydrogen lies entirely in the ultraviolet region?The hydrogen spectral lines that lie in the visible region of the electromagnetic spectrum belong to the:The major shortcoming of the Rutherford atomic model was that it could not explain:For a hydrogen-like ion of atomic number $Z$, the ground-state energy is:An electron in a hydrogen atom undergoes a transition from $n = 3$ to $n = 2$. The energy of the emitted photoAccording to VSEPR theory, the shape of a molecule is determined byThe hybridisation of carbon in methane (CH₄) isWhich molecule is non-polar despite having polar bonds?The bond order of the oxygen molecule O₂ (by molecular orbital theory) isA coordinate (dative) bond differs from a normal covalent bond in thatWhich species has sp hybridisation on the central atom?As bond order increases, bond lengthAn ionic bond forms byThe shape of NH₃ is pyramidal rather than planar becauseWhich has the highest dipole moment?Among the following, which is paramagnetic?Formal charge on an atom = Per NCERT §3.7.1(c), the FIRST IONISATION ENTHALPY of an element X represents which process?Per NCERT §3.7.1(d), the ELECTRON GAIN ENTHALPY ΔₑgH represents enthalpy change for which reaction?The modern periodic law arranges elements in order of:Across a period from left to right, atomic radius generally:Among Li, Na, K, Cs, the element with the highest first ionisation enthalpy is:The most electronegative element on the periodic table is: