Number of ambidentate ligands among the following is _______.
\(NO _2^{-}, SCN ^{-}, C _2 O _4^{2-}, NH _3, CN ^{-}, SO _4^{2-}, H _2 O\).

A solution containing \(10 \mathrm{~g}\) of an electrolyte \(\mathrm{AB}_2\) in \(100 \mathrm{~g}\) of water boils at \(100.52^{\circ} \mathrm{C}\). The degree of ionization of the electrolyte \((\alpha)\) is _______ \(\times 10^{-1}\). (nearest integer) [Given : Molar mass of \(\mathrm{AB}_2=200 \mathrm{~g} \mathrm{~mol}^{-1} \cdot \mathrm{K}_{\mathrm{b}}\) (molal boiling point elevation const. of water) \(=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\), boiling point of water \(=100^{\circ} \mathrm{C}\); \(\mathrm{AB}_2\) ionises as \(\left.\mathrm{AB}_2 \rightarrow \mathrm{A}^{2+}+2 \mathrm{~B}^{-}\right]\)

During the qualitative analysis of \(SO _3^{2-}\) using dilute \(H _2 SO _4, SO _2\) gas is evolved which turns \(K _2 Cr _2 O _7\) solution (acidified with dilute \(H _2 SO _4\) ):

It is true that :

For which of the following processes, \(\Delta S\)  is negative?

The freezing point of benzene decreases by \(0.45^o C\) when \(0.2\,g\) of acetic acid is added to \(20\, g\) of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be .......... \(\%\) \((K_f \) for benzene \(= 5.12 \,K\, kg\, mol^{-1})\)

Energy of an electron is given by \(E =- 2.178 \times 10^{-18}\,J \, \left( {\frac{{{Z^2}}}{{{n^2}}}} \right) .\) Wavelength of light required to excite an electron in an hydrogen atom from level \(n = 1\) to \(n = 2\) will be : \((h = 6.62 \times 10^{-34} \,Js\) and \(c = 3.0 \times 10^8 \,ms^{-1})\)

Water from a pipe is coming at a rate of \(100\, litres\) per minute. If the radius of the pipe is \(5\, cm\), the Reynolds number for the flow is of the order of : (density of water \(= 1000\, kg/m^3\), coefficient of viscosity of water \(= 1\, mPa\, s\))

Considering acetic acid dissociates in water, its dissociation constant is \(6.25 \times 10^{-5}\). If \(5 \mathrm{~mL}\) of acetic acid is dissolved in \(1\) litre water, the solution will freeze at \(-\mathrm{x} \times 10^{-2}{ }^{\circ} \mathrm{C}\), provided pure water freezes at \(0^{\circ} \mathrm{C}\). \(\mathrm{x}=\) _______ (Nearest integer) Given : \(\left(\mathrm{K}_{\mathrm{r}}\right)_{\text {water }}=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\). density of acetic acid is \(1.2 \mathrm{~g} \mathrm{~mol}^{-1}\) molar mass of water \(=18 \mathrm{~g} \mathrm{~mol}^{-1}\). molar mass of acetic acid \(=60 \mathrm{~g} \mathrm{~mol}^{-1}\). density of water \(=1 \mathrm{~g} \mathrm{~cm}^{-3}\) Acetic acid dissociates as \(\mathrm{CH}_3 \mathrm{COOH} \rightleftharpoons \mathrm{CH}_3 \mathrm{COO}^{\oplus}+\mathrm{H}^{\oplus}\)

The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is _______.

Which one of the following molecules does not show stereo isomerism?

The area (in sq. units) of an equilateral triangle inscribed in the parabola \(\mathrm{y}^{2}=8 \mathrm{x},\) with one of its vertices on the vertex of this parabola, is 

Which intermolecular force is most responsible in allowing xenon gas to liquefy?