Among the following compounds, the most acidic is :

The following results were obtained during study of the reaction \(2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_2(\mathrm{~g}) \rightarrow 2 \mathrm{NOCl}(\mathrm{g})\). Determine the value of \([\mathrm{X}]\) in \(\mathrm{mol} / \mathrm{L}\)
\(\begin{array}{|c|c|c|c|} \hline \text{Experiment} & \text{[NO] mol/L} & \left[\mathrm{Cl}_2\right] \text{ mol/L} & \text{Initial rate of formation. [NOCl] mol/L/min} \\ \hline \text{I} & 0.2 & 0.2 & 6.0 \times 10^{-3} \\ \hline \text{II} & 0.2 & 0.4 & 2.4 \times 10^{-2} \\ \hline \text{III} & 0.4 & 0.2 & 1.2 \times 10^{-2} \\ \hline \text{IV} & X & 0.6 & 1.35 \times 10^{-1} \\ \hline \end{array}\)

For a reaction \(\mathrm{X}_2(\mathrm{l})+\mathrm{Y}_2(\mathrm{~g}) \leftrightharpoons 2 \mathrm{XY}(\mathrm{g})\), the \(\Delta \mathrm{H}^0\) and \(\Delta \mathrm{S}^0\) are \(+29.3 \mathrm{~kJ} / \mathrm{mol}\) and \(104.1 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\) respectively at 298 K . Find the free energy change in \(\mathrm{kJ} / \mathrm{mol}\).

The correct IUPAC name of the coordination compound \(\text{K}_3[\text{Fe}(\text{CN})_5\text{NO}_2]\) is

Which one of the following statements is correct?

The pH at which an acid indicator with \(K_\alpha=1 \times 10^{-5}\) changes colour when the indicator concentration is \(1 \times 10^{-3} \mathrm{M}\) is

Minimum mumber of nodes are present in

How many grams of potassium dichromate are required to oxidise 20.0 g of \(\mathrm{Fe}^{2+}\) in \(\mathrm{FeSO}_4\) to \(\mathrm{Fe}^{3+}\) if the reaction carried out in an acidic medium? Molar mass of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and \(\mathrm{FeSO}_4\) are 294 and 152 respectively.

A charged particle is released from rest in a region of space in which steady and uniform electric and magnetic fields are parallel to each other. The particle will move in a

Two equal forces \((P\) each \()\) act at a point inclined to each other at an angle of \(120^{\circ}\). The magnitude of their resultant is

If the area of region bounded by the lines \(y=2 x+1, x\)-axis, \(x=a\) and \(x=3\) is 10 sq units. Then the value of ' \(a\) ' is

The height at which the acceleration due to gravity becomes \(\dfrac{g}{16}\) (where, \(g=\) acceleration due to gravity on the surface of the earth) in terms of \(R\) is, if \(R\) is the radius of earth.

The equation to two circles which touch the \(Y\)-axis at \((0,3)\) and make an intercept of 8 units on \(X\)-axis are