JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
X and Y are the number of electrons involved, respectively during the oxidation of \( I^{-} \) to \( I_{2} \) and \( S^{2-} \) to S by acidified \( K_{2}Cr_{2}O_{7} \). The value of X + Y is ______.
- A 6
- B 10
- C 12
- D 8
Answer & Solution
Correct Answer
(C) 12
Step-by-step Solution
Detailed explanation
\(Cr _2 O _7^{2-}+14 H ^{+}+6 I ^{-} \rightarrow 2 Cr ^{3+}+3 I _2+7 H _2 O\) no. of moles \(e ^{-}\)involved \(= x =6\) \(Cr _2 O _7^{2-}+3 S^{2-}+14 H ^{+} \rightarrow+ S +2 Cr ^{3+}+7 H _2 O\) No. of moles \(e ^{-}\) involved \(= y =6\) Sum of \(x+y=6+6=12\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Which one of the following statements is not correct?JEE Mains 2014 Hard
- Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect ? (Bohr's radius is represented by a \(a_0\))JEE Mains 2025 Hard
- \(A ( g ) \rightarrow 2 B ( g )+ C ( g )\) is a first order reaction. The initial pressure of the system was found to be \(800\,mm\,Hg\) which increased to \(1600\,mm\,Hg\) after \(10\,min\). The total pressure of the system after \(30\,min\) will be \(.........\,mm\,Hg\). (Nearest integer)JEE Mains 2023 Medium
- The \(IUPAC\) nomenclature of an element with electronic configuration \([ Rn ] 5 f ^{14} 6 d ^{1} 7 s ^{2}\) is.JEE Mains 2022 Medium
- Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizaro Reaction
C. Aldol Condensation
D. Tollen's Test
E. Clemmensen Reduction
Choose the correct answer from the options given below:JEE Mains 2025 Medium - The rate constant \((k)\) of a reaction is measured at different temperatures \((T),\) and the data are plotted in the given figure. The activation energy of the reaction in \(kJ\, mol ^{-1}\) is : (\(R\) is gas constant)
JEE Mains 2020 Medium
More PYQs from JEE Mains
- Let P (10, 2√15) be a point on the hyperbola \( \frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1 \) whose foci are S and S'. If the length of its latus rectum is 8, then the square of the area of \( \triangle PSS' \) is equal to:JEE Mains 2026 Hard
- If \(\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}} \frac{96 x^2 \cos ^2 x}{\left(1+e^x\right)} \mathrm{d} x=\pi\left(\alpha \pi^2+\beta\right), \alpha, \beta \in \mathbb{Z}\), then \((\alpha+\beta)^2\) equalsJEE Mains 2025 Medium
- If compound A reacts with \(B\) following first order kinetics with rate constant \(2.011 \times 10^{-3} s ^{-1}\). The time taken by \(A\) (in seconds) to reduce from \(7\,g\) to \(2\,g\) will be \(.........\) (Nearest Integer) \([\log 5=0.698, \log 7=0.845, \log 2=0.301]\)JEE Mains 2023 Medium
- If \({ }^{2n } C _3:{ }^{n } C _3=10: 1\), then the ratio \(\left(n^2+3 n\right):\left(n^2-3 n+4\right)\) isJEE Mains 2023 Medium
- If the angle made by the tangent at the point \(\left(x_{0}, y_{0}\right)\) on the curve \(x=12(t+\sin t \cos t)\), \(y =12(1+\sin t )^{2}, 0 < t < \frac{\pi}{2}\), with the positive \(x\)-axis is \(\frac{\pi}{3}\), then \(y _{0}\) is equal toJEE Mains 2022 Medium
- A parallel plate capacitor whose capacitance \(C\) is \(14\, pF\) is charged by a battery to a potential difference \(V =12\, V\) between its plates. The charging battery is now disconnected and a porcelin plate with \(k =7\) is inserted between the plates, then the plate would oscillate back and forth between the plates with a constant mechanical energy of \(..........pJ\). (Assume no friction)JEE Mains 2021 Medium