(Assume: KMnO4 reacts only with Fe2+ in the solution Use: Molar mass of iron as 56 g mol–1)
The value of x is ________.
Correct Answer: 1.875
Solution and Explanation
8H+ + 5Fe2+ + MnO – → 5Fe3+ + Mn2+ + 4H2O
For 25 ml,
meq of Fe2+ = meq of MnO –
= 12.5 × 0.03 × 5
For 250 ml,
m moles of Fe2+ = \(12.5 \times 0.03 \times 5 \times \frac{250}{25}\)
moles of Fe2+ = \(\frac{18.75}{1000}\)mol
= 18.75 × 10–3 mol
= 1.875 × 10–2 mol
x = 1.875
The value of y is ________.
Correct Answer: 18.75
Solution and Explanation
Weight of Fe2+ = 1.875 × 10–2 × 56 = 1.05 g
% purity of Fe2+ y = 18.75%
Top Questions on Redox reactions
- For a \( {Mg} | {Mg}^{2+}(aq) || {Ag}^{+}(aq) | {Ag} \), the correct Nernst Equation is:
- JEE Main - 2025
- Chemistry
- Redox reactions
The steam volatile compounds among the following are:
Choose the correct answer from the options given below:
- JEE Main - 2025
- Chemistry
- Redox reactions
Given below are two statements:
Statement (I): The first ionization energy of Pb is greater than that of Sn.
Statement (II): The first ionization energy of Ge is greater than that of Si.
In light of the above statements, choose the correct answer from the options given below:- JEE Main - 2025
- Chemistry
- Redox reactions
- The heat of formation of \( \text{SO}_2(g) \) is given by: \[ S(g) + \frac{3}{2} O_2(g) \rightarrow SO_3(g) + 2x \, \text{kcal} \] \[ SO_2(g) + \frac{1}{2} O_2(g) \rightarrow SO_3(g) + y \, \text{kcal} \]
- JEE Main - 2025
- Chemistry
- Redox reactions
- Match the LIST-I with LIST-II (Redox Reactions).
\[ \begin{array}{|c|c|} \hline \textbf{LIST-I (Redox Reaction)} & \textbf{LIST-II (Type of Redox Reaction)} \\ \hline A. \, CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l) & I. \, \text{Disproportionation reaction} \\ B. \, 2NaH(s) \rightarrow 2Na(s) + H_2(g) & II. \, \text{Combination reaction} \\ C. \, V_2O_5(s) + 5Ca(s) \rightarrow 2V(s) + 5CaO(s) & III. \, \text{Decomposition reaction} \\ D. \, 2H_2O(aq) \rightarrow 2H_2(g) + O_2(g) & IV. \, \text{Displacement reaction} \\ \hline \end{array} \]
Choose the correct answer from the options given below:- JEE Main - 2025
- Chemistry
- Redox reactions
Questions Asked in JEE Advanced exam
- Four identical thin, square metal sheets, S1, S2, S3 and S4, each of side a are kept parallel to each other with equal distance \(d (≪ a)\) between them, as shown in the figure. Let \(C_0 = \epsilon_0\frac{a^2}{d}, \)where \(\epsilon_0\) is the permittivity of free space.
Match the quantities mentioned in List-I with their values in List-II and choose the correct option.List-I List-II P The capacitance between S1 and S4, with S2 and S3 not connected, is I \(3C_0\) Q The capacitance between S1 and S4, with S2 shorted to S3, is II \(\frac{C_0}{2}\) R The capacitance between S1 and S3, with S2 shorted to S4, is III \(\frac{C_0}{3}\) S The capacitance between S1 and S2, with S3 shorted to S1, and S2 shorted to S4, is IV \(2\frac{C_0}{3}\) \[2C_0\] - JEE Advanced - 2024
- Moment Of Inertia
- A charge is kept at the central point P of a cylindrical region. The two edges subtend a half-angle \(\theta\) at P, as shown in the figure. When \(\theta = 30\) , then the electric flux through the curved surface of the cylinder is \(Φ\). If \(\theta= 60\degree\) , then the electric flux through the curved surface becomes \(Φ/√𝑛\), where the value of n is______.
- JEE Advanced - 2024
- Electric Flux
- Let \(\frac{\pi}{2}<x<\pi\) be such that \(\cot x=\frac{-5}{\sqrt{11}}\). Then
\((\sin\frac{11x}{2})(\sin 6x-\cos6x)+(\cos\frac{11x}{2})(\sin 6x+\cos 6x)\)
is equal to- JEE Advanced - 2024
- Trigonometric Identities
- A region in the form of an equilateral triangle (in x-y plane) of height L has a uniform magnetic field 𝐵⃗ pointing in the +z-direction. A conducting loop PQR, in the form of an equilateral triangle of the same height 𝐿, is placed in the x-y plane with its vertex P at x = 0 in the orientation shown in the figure. At 𝑡 = 0, the loop starts entering the region of the magnetic field with a uniform velocity 𝑣 along the +x-direction. The plane of the loop and its orientation remain unchanged throughout its motion.
Which of the following graph best depicts the variation of the induced emf (E) in the loop as a function of the distance (𝑥) starting from 𝑥 = 0? - Let R2 denote R × R. Let
S = {(a, b, c) : a, b, c ∈ R and ax2 + 2bxy + cy2 > 0 for all (x, y) ∈ R2 - {(0, 0}}.
Then which of the following statements is (are) TRUE ?- JEE Advanced - 2024
- Quadratic Equations