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PUCET (Punjab) JEE Main 2023 Mixed — practice questions — page 3

Explore 95 free JEE Main 2023 Mixed questions in PUCET (Punjab) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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JEE Main 2023 Mixed questions and exercises with answers

Showing questions 61–90 of 95.

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 →Tap every statement Hund's rule requiresRead the answer and worked solution →The fundamental particlesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Which principle is being described?Read the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →

Worked practice questions

In the photoelectric effect, the *stopping potential* $V_0$ varies with the frequency of incident light as

  1. quadratic
  2. linear, with slope $h/e$
  3. inversely proportional
  4. linear, with slope $\phi/e$
Show answer and solution

Correct answer: B. linear, with slope $h/e$

$eV_0 = h\nu - \phi$. So $V_0 = (h/e)\nu - \phi/e$ is a straight line in $V_0$ vs $\nu$, slope $h/e$ — the same for all metals. The y-intercept depends on $\phi$, distinguishing the metals.

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Which of the following is **NOT** a possible set of quantum numbers for a 3d electron?

  1. $(3, 1, +1, -1/2)$
  2. $(3, 2, -2, -1/2)$
  3. $(3, 2, 0, +1/2)$
  4. $(3, 2, +2, +1/2)$
Show answer and solution

Correct answer: A. $(3, 1, +1, -1/2)$

For 3d, $n=3, l=2$. Option A has $l=1$, which would be a 3p orbital, not 3d. Options B–D all satisfy $(n=3, l=2)$ with valid $m_l$ and $m_s$.

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The total number of electrons that can fit in the $M$ shell ($n=3$) is

  1. $8$
  2. $10$
  3. $32$
  4. $18$
Show answer and solution

Correct answer: D. $18$

Maximum electrons in shell $n$ is $2n^2$. For $n=3$: $2 \cdot 9 = 18$. Made up of $3s^2 + 3p^6 + 3d^{10}$.

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