When salt is added to water, which of the following statement is true?

Consider the single electrode process \(4 \mathrm{H}^{+}+4 \mathrm{e}^{-} \rightleftharpoons 2 \mathrm{H}_2\) catalysed by platinum black electrode in \(\mathrm{HCl}\) electrolyte. The potential of the electrode is \(-0.059 \mathrm{~V}\). SHE. What is the concentration of the acid in the hydrogen half cell if the \(\mathrm{H}_2\) pressure is \(1 \mathrm{bar}\) ? \[ 4 \mathrm{H}^{+}+4 e^{-} \rightleftharpoons 2 \mathrm{H}_2 \]

\[ \begin{aligned} & \text { Given } \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(l) ; \Delta \mathrm{H}=-285 \mathrm{~kJ} \ & \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(l) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-76.6 \mathrm{~kJ} \ & \mathrm{~N}_2(\mathrm{~g})+3 \mathrm{O}_2(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-348.2 \mathrm{~kJ} \ & \text { Calculate the } \Delta \mathrm{H} \text { of } 2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \end{aligned} \] Calculate the \(\Delta \mathrm{H}\) of \(2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})\).

Two oxides of nitrogen, \(\mathrm{NO}\) and \(\mathrm{NO}_2\) react together at \(253 \mathrm{~K}\) and form a compound of nitrogen \(X\). \(X\) reacts with water to yield another compound of nitrogen \(Y\). The shape of the anion of \(Y\) molecule is :

Which one of the following noble gases is used in miner's cap lamps?

Which one of the following statement is correct for \(d^4\) ions [ \(P=\) pairing energy]

At \(300 \mathrm{~K}\), the osmotic pressure of a decinormal solution of sodium chloride is \(4.82 \mathrm{~atm}\). The degree of dissociation of sodium chloride is \(\mathrm{x} \times 10^{-2}\). The value of \(x\) is \(\left(\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{moi}^{-1}\right)\)

\(\left\{x \in R: \frac{14 x}{x+1}-\frac{9 x-30}{x-4} < 0\right\}\) is equal to

If \(y=\sin \left(m \sin ^{-1} x\right)\), then \(\left(1-x^2\right) y_2-x y_1\) is equal to \(\left(\right.\) Here, \(y_n\) denotes \(\left.\frac{d^n y}{d x^n}\right)\)

Which one of the following compound is hypervalent?

If \(\mathbf{a} \neq \mathbf{0}, \mathbf{b} \neq \mathbf{0}, \mathbf{c} \neq 0, \mathbf{a} \times \mathbf{b}=\mathbf{0}\) and \(\mathbf{b} \times \mathbf{c}=0\), then \(\mathbf{a} \times \mathbf{c}\) is equal to

When a metal road of length \(l\) is placed in a magnetic field \(B\) and moved with velocity \(v\) perpendicular to the field, then the induced emf across its ends is

If \(x \neq(2 n+1) \frac{\pi}{2}, n \in \mathbb{Z}\) and \(\cos x \neq \frac{-1}{2}\) then \[ \int\left(\frac{\sin x+\sin 2 x}{1+\cos x+\cos 2 x}\right)^2 d x= \]