NEET UG Atoms — practice questions
50 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Atoms in the app →According 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 = The most striking result of Rutherford's gold-foil experiment that killed the Thomson model was:The energy of the $n = 3$ level of hydrogen is:In the Bohr model, the radius of the $n$th orbit of hydrogen scales as:The Balmer series of hydrogen corresponds to transitions:In the Geiger–Marsden α-scattering experiment, the observation that MOST α-particles passed nearly UNDEFLECTEDBohr's FIRST postulate of the hydrogen atom states thatIn the Bohr model of the hydrogen atom, the energy of an electron in the $n^\text{th}$ orbit is given by $E_n Bohr's quantisation condition for the angular momentum $L$ of an electron in the $n^\text{th}$ orbit isWhen the electron in a hydrogen atom makes a transition from $n = 2$ (first excited state) DIRECTLY back to $nIn the Bohr model, the radius of the $n^\text{th}$ orbit of a hydrogen-LIKE atom of atomic number $Z$ is $r_n An $\alpha$-particle of energy $7.7\,\text{MeV}$ is directed head-on at a stationary gold nucleus ($Z = 79$). The ratio of the first excitation energy of a hydrogen atom ($E_2 - E_1$) to its ionisation energy from the grIn the Bohr model, an electron transitions from $n = 3$ to $n = 2$ in a hydrogen atom (the H-α line of the BalIn the Bohr model, the velocity of an electron in the $n^\text{th}$ orbit of hydrogen is given by $v_n \proptoAccording to de Broglie's interpretation of Bohr's quantisation, the circumference of the $n^\text{th}$ stableA photon of wavelength $\lambda = 102.6\,\text{nm}$ is incident on a ground-state hydrogen atom. The atom can The first model of the atom was proposed by:Thomson proposed his model of the atom in the year:In Thomson's model, the positive charge is spread:In Thomson's model, electrons are compared to seeds in a:Thomson's model is picturesquely called the:In Rutherford's model, the mass and positive charge sit in the:Rutherford's model compares electrons around the nucleus to:The scattering experiment was carried out in 1911 by Marsden and:Each element emits a spectrum of radiation that is:An atomic gas is usually excited by passing through it an electric:The hydrogen series discovered in 1885 is named after:Which of these is a series in the hydrogen spectrum?Beyond the series limit, the hydrogen spectrum shows a:Bohr set out his theory of the atom in how many postulates?By Bohr's first postulate, an electron in a stable orbit emits:Bohr called the stable non-radiating orbits the:Bohr's second postulate quantises which quantity?Allowed angular momenta are integral multiples of h divided by:By Bohr's third postulate, a transition to lower energy emits a:The energy of the emitted photon equals the difference between the:The lowest energy state of an atom is called the:The ionisation energy of the hydrogen atom is about: