alleryStart learning →Electronic configuration of Cr³⁺ (Z = 24):
- [Ar] 3d⁴
- [Ar] 3d³
- [Ar] 3d⁵
- [Ar] 3d⁵ 4s¹
Show answer and solution
Correct answer: B. [Ar] 3d³
**Cr:** [Ar] 3d⁵ 4s¹.
Cr³⁺: lose 4s and two 3d → [Ar] 3d³.
Three unpaired electrons. Paramagnetic.
Indian Navy SSR JEE Main 2023 Mixed — practice questions
Explore 34 free JEE Main 2023 Mixed questions in Indian Navy SSR Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Electronic configuration of Cr³⁺ (Z = 24):Read the answer and worked solution →For first-order reaction with t₁/₂ = 10 min, k =Read the answer and worked solution →In vacuum, the velocity of electromagnetic radiation isRead 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 →In the photoelectric effect, the *stopping potential* $V_0$ varies with the frequency of incident light asRead the answer and worked solution →The Bohr orbit velocity of the ground-state electron in hydrogen is aboutRead the answer and worked solution →As per your syllabus, what is the MOLECULAR MASS of methane (CH₄) — using C = 12.011 u and H = 1.008 u?Read the answer and worked solution →As per your syllabus, what is the energy of the first orbit of He⁺ (Z = 2, n = 1)?Read 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 →Tap every statement true of the Schrodinger modelRead the answer and worked solution →
Worked practice questions
For first-order reaction with t₁/₂ = 10 min, k =
- 1/min
- 10/min
- 6.93/min
- 0.0693/min (= ln2/10)
Show answer and solution
Correct answer: D. 0.0693/min (= ln2/10)
We have k = 0.693/t₁/₂.
That is k = 0.693/10.
So k = 0.0693 /min.
In vacuum, the velocity of electromagnetic radiation is
- $3 \times 10^{8}\,m\,s^{-1}$
- $3 \times 10^{5}\,m\,s^{-1}$
- $3 \times 10^{6}\,m\,s^{-1}$
- $3 \times 10^{10}\,m\,s^{-1}$
Show answer and solution
Correct answer: A. $3 \times 10^{8}\,m\,s^{-1}$
All EM radiation travels at $c = 3 \times 10^{8}\,m\,s^{-1}$ in vacuum, regardless of wavelength.
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