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PUCET (Punjab) JEE Main 2023 Mixed — practice questions

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 1–30 of 95.

Number of moles of KMnO₄ required to oxidize 1 mole of Fe²⁺ in acidic solution:Read the answer and worked solution →Electronic configuration of Cr³⁺ (Z = 24):Read the answer and worked solution →Among Cu, Zn, Pt, Au, which is the noble metal MOST resistant to corrosion?Read the answer and worked solution →pH of 10⁻⁸ M HCl solution (in water):Read the answer and worked solution →In octahedral complex with d⁵ metal and strong field ligand, magnetic moment:Read the answer and worked solution →Number of stereoisomers of 2-bromobutane:Read the answer and worked solution →Which is the strongest oxidizer in halogens?Read the answer and worked solution →Order of basicity: NH₃, PH₃, AsH₃, SbH₃:Read the answer and worked solution →Number of σ and π bonds in CO₂:Read the answer and worked solution →For first-order reaction with t₁/₂ = 10 min, k =Read the answer and worked solution →Among NH₃, PH₃, H₂O, H₂S — most acidic:Read the answer and worked solution →Color of [Cu(NH₃)₄]²⁺:Read the answer and worked solution →Which gives positive iodoform test?Read the answer and worked solution →For coordination compound [Co(NH₃)₅Cl]Br₂, total ions in solution:Read the answer and worked solution →Number of moles of O₂ needed to completely oxidize 1 mole of C₂H₅OH to CO₂ and H₂O:Read the answer and worked solution →Crystal field stabilization energy (CFSE) for [Co(NH₃)₆]³⁺ (Co³⁺ d⁶ low-spin):Read the answer and worked solution →Standard enthalpy of formation of an element in its standard state:Read the answer and worked solution →Bond order of N₂:Read the answer and worked solution →Hybridization of P in PCl₅:Read the answer and worked solution →What does Fehling's solution test detect?Read the answer and worked solution →The wave number $\bar{\nu}$ of electromagnetic radiation is defined asRead the answer and worked solution →In vacuum, the velocity of electromagnetic radiation isRead the answer and worked solution →A photon has wavelength $400\,nm$. Its frequency is approximatelyRead the answer and worked solution →The wave number of a photon of frequency $6 \times 10^{14}\,Hz$ (in vacuum) isRead the answer and worked solution →According to Planck's quantum theory, energy is emitted or absorbed in discrete packets calledRead the answer and worked solution →The energy of a photon of wavelength $\lambda$ is given byRead the answer and worked solution →A photon of wavelength $300\,nm$ has approximately what energy in eV? (Use $hc = 1240\,eV\,nm$.)Read the answer and worked solution →In the photoelectric effect, the kinetic energy of the ejected electron depends onRead the answer and worked solution →The threshold frequency $\nu_0$ for a metal is the minimum frequencyRead the answer and worked solution →Light of frequency $\nu = 2\nu_0$ ejects photoelectrons from a metal with threshold frequency $\nu_0$. The maximum KE of the photoelectrons isRead the answer and worked solution →

Worked practice questions

Number of moles of KMnO₄ required to oxidize 1 mole of Fe²⁺ in acidic solution:

  1. 2
  2. 5
  3. 1/5 (Mn(VII) → Mn(II): 5e⁻ accepted; Fe²⁺ → Fe³⁺: 1e⁻ lost)
  4. 1
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Correct answer: C. 1/5 (Mn(VII) → Mn(II): 5e⁻ accepted; Fe²⁺ → Fe³⁺: 1e⁻ lost)

MnO₄⁻ + 5 e⁻ → Mn²⁺. Fe²⁺ → Fe³⁺ + e⁻. **So 1 MnO₄⁻ oxidizes 5 Fe²⁺ → 1/5 mole KMnO₄ per mole Fe²⁺.**

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Electronic configuration of Cr³⁺ (Z = 24):

  1. [Ar] 3d⁴
  2. [Ar] 3d³
  3. [Ar] 3d⁵
  4. [Ar] 3d⁵ 4s¹
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Correct answer: B. [Ar] 3d³

**Cr:** [Ar] 3d⁵ 4s¹. Cr³⁺: lose 4s and two 3d → [Ar] 3d³. Three unpaired electrons. Paramagnetic.

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Among Cu, Zn, Pt, Au, which is the noble metal MOST resistant to corrosion?

  1. Au (E° = +1.5 V, most positive reduction potential)
  2. Pt
  3. Cu
  4. Zn
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Correct answer: A. Au (E° = +1.5 V, most positive reduction potential)

Gold has the highest reduction potential (E° = +1.5 V), most resistant to corrosion. **Order:** Au > Pt > Cu > Zn (Zn corrodes easily, used as sacrificial anode).

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More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesSolutionsCoordination Compounds