JEE Mains · Chemistry · STD 11 - 7. Redox reactions
The oxidation states of transition metal atoms in \(K _{2} Cr _{2} O _{7}, KMnO _{4}\) and \(K _{2} FeO _{4},\) respectively, are \(x , y\) and \(z\). The sum of \(x , y\) and \(z\) is
- A \(12\)
- B \(25\)
- C \(19\)
- D \(22\)
Answer & Solution
Correct Answer
(C) \(19\)
Step-by-step Solution
Detailed explanation
\(K _{2} Cr _{2} O _{7}\) \(2(+1)+2 x+7(-2)=0\) \(x=+6\) In \(K _{2} Cr _{2} O _{7},\) Transition metal \(( Cr )\) present in +6 oxidation state. \(KMnO _{4}\) \((+1)+y+4(-2)=0\) \(x=+7\) In \(KMnO _{4}\), transition metal (Mn) present in \(+7\) oxidation state…
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
- An octahedral complex of \(Co^{3+}\) is diamagnetic. The hybridisation involved in the formation of the complex isJEE Mains 2014 Hard
- The number of different chain isomers for \(\mathrm{C}_7 \mathrm{H}_{16}\) is _______.JEE Mains 2024 Medium
- Which of the following has unpaired electron \((s)\) ?JEE Mains 2014 Hard
- The value of \(x\) in compound ' \(D\) ' is \(.........\).
JEE Mains 2023 Hard - In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound (Aqueous tension at \(300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg})\) is _______.JEE Mains 2025 Medium
- Identify correct statement from the following:
A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-2-ene shows optical isomerism.
D. But-1-ene and but-2-ene are functional isomers.
E. Pentane and 2, 2-dimethyl propane are chain isomers.
Choose the correct answer from the options given below:JEE Mains 2026 Hard
More PYQs from JEE Mains
- If \(\overrightarrow x = 3\hat i - 6\hat j - \hat k\) , \(\overrightarrow y = \hat i + 4\hat j - 3\hat k\) and \(\,\,\overrightarrow z = 3\hat i - 4\hat j - 12\hat k\) , then the magnitude of the projection of \(\overrightarrow x \times \overrightarrow y \) on \(\overrightarrow z\) isJEE Mains 2014 Medium
- Match List \(I\) with List \(II\). Choose the correct answer from the options given below:
List \(-I\) List \(-II\) \(A.\) Melting point \([\mathrm{K}]\) \(I.\) \(\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\) \(B.\) Ionic Radius \(\left[\mathrm{M}^{+3} / \mathrm{pm}\right]\) \(II.\) \(\mathrm{B}>\mathrm{Tl}>\mathrm{Al} \approx \mathrm{Ga}>\mathrm{In}\) \(C.\) \(\Delta_{\mathrm{i}} \mathrm{H}_1 \) \([\mathrm{~kJ} \mathrm{~mol}^{-1}]\) \(III.\) \(\mathrm{Tl}>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}\) \(D.\) Atomic Radius \([pm]\) \(IV.\) \(\mathrm{B}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}\) JEE Mains 2024 Medium - Let a triangle be bounded by the lines \(L _{1}: 2 x +5 y =10\); \(L _{2}:-4 x +3 y =12\) and the line \(L _{3}\), which passes through the point \(P (2,3)\), intersect \(L _{2}\) at \(A\) and \(L _{1}\) at \(B\). If the point \(P\) divides the line-segment \(A B\), internally in the ratio \(1: 3\), then the area of the triangle is equal toJEE Mains 2022 Hard
- Consider the combination of \(2\) capacitors \(C _{1}\) and \(C _{2},\) with \(C _{2}> C _{1},\) when connected in parallel, the equivalent capacitance is \(\frac{15}{4}\) time the equivalent capacitance of the same connected in series. Calculate the ratio of capacitors, \(\frac{ C _{2}}{ C _{1}}\)JEE Mains 2021 Hard
- The output of the given combination gates represents
JEE Mains 2021 Medium - If mean and standard deviation of \(5\) observations \(x_1 ,x_2 ,x_3 ,x_4 ,x_5\) are \(10\) and \(3\), respectively, then the variance of \(6\) observations \(x_1 ,x_2 ,.....,x_3\) and \(-50\) is equal toJEE Mains 2019 Hard