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JEECUP (UP Polytechnic) Atomic combinations — practice questions — page 3

Explore 103 free Atomic combinations questions in JEECUP (UP Polytechnic) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic combinations questions and exercises with answers

Showing questions 61–90 of 103.

Which of the following orbital shapes is dumbbell-shaped along an axis?Read the answer and worked solution →How many *angular* nodes does a $3d$ orbital have?Read the answer and worked solution →The number of *radial* nodes in a $4s$ orbital isRead the answer and worked solution →The ionisation energy of hydrogen in its ground state isRead the answer and worked solution →For $He^+$, the ionisation energy from its ground state isRead the answer and worked solution →Which transition in the hydrogen atom emits the largest amount of energy?Read the answer and worked solution →Which of the following experimental phenomena could **NOT** be explained by classical EM wave theory?Read the answer and worked solution →The Bohr model failed to explainRead the answer and worked solution →In the photoelectric effect, the *stopping potential* $V_0$ varies with the frequency of incident light asRead the answer and worked solution →Which of the following is **NOT** a possible set of quantum numbers for a 3d electron?Read the answer and worked solution →The total number of electrons that can fit in the $M$ shell ($n=3$) isRead the answer and worked solution →The Bohr radius for hydrogen ($n=1, Z=1$) is approximatelyRead the answer and worked solution →The proton was discovered through experiments involvingRead the answer and worked solution →The neutron was discovered byRead the answer and worked solution →In Thomson's atomic model (plum-pudding), the atom isRead the answer and worked solution →The Bohr orbit velocity of the ground-state electron in hydrogen is aboutRead the answer and worked solution →The Rydberg constant for hydrogen, in SI units, isRead the answer and worked solution →Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →True or false: Bohr's modelRead the answer and worked solution →Complete the reason Bohr's model failsRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Match each quantum number to what it is calledRead the answer and worked solution →True or false: the quantum mechanical modelRead the answer and worked solution →Order the structure: from atom down to electronRead the answer and worked solution →Complete the (n + l) ruleRead the answer and worked solution →True or false: orbital energiesRead the answer and worked solution →Match each rule to what it forbids or requiresRead the answer and worked solution →

Worked practice questions

Which of the following orbital shapes is dumbbell-shaped along an axis?

  1. d orbital (in general)
  2. f orbital
  3. p orbital
  4. s orbital
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Correct answer: C. p orbital

p orbitals ($p_x, p_y, p_z$) are dumbbell-shaped along their axis with a node at the nucleus. s is spherical; d (except $d_{z^2}$) is four-lobed cloverleaf.

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How many *angular* nodes does a $3d$ orbital have?

  1. $1$
  2. $2$
  3. $0$
  4. $3$
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Correct answer: B. $2$

Angular nodes = $l$. For d ($l=2$): 2 angular nodes. Total nodes = $n - 1 = 2$; radial nodes = $n - l - 1 = 0$. A 3d orbital has 2 angular nodes and no radial nodes.

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The number of *radial* nodes in a $4s$ orbital is

  1. $4$
  2. $1$
  3. $0$
  4. $3$
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Correct answer: D. $3$

Radial nodes $= n - l - 1$. **For 4s:** $4 - 0 - 1 = 3$.

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