Gaseous Nitrous oxide decomposes at \(298 \mathrm{~K}\) to form Nitrogen gas and Oxygen gas. The \(\Delta \mathbf{H}\) for the reaction at \(1.0 \mathrm{~atm}\) pressure and \(298 \mathrm{~K}\) is \(\mathbf{- 1 6 3 . 1 5} \mathbf{~ k J}\). Calculate Internal energy change for the decomposition of \(100 \mathrm{~g}\) of Nitrous oxide gas under the same conditions of temperature and pressure.

The reagent used to convert an alkyne to alkene is

When \(\mathrm{KBr}\) is dissolved in water, \(\mathrm{K}^{+}\)ions are

Which of the following compound cannot be prepared by Williamson's synthesis?

Semiconductors of very high purity are obtained by

\(\mathrm{Ti}^{2+}\) is purple while \(\mathrm{Ti}^{4+}\) is colourless because

Given below are 4 statements. Two of these are correct statements. Identify them.
A. \(\mathrm{Co}^{2+}\) is easily oxidised to \(\mathrm{Co}^{3+}\) in the presence of a strong ligand like \(\mathrm{CN}^{-}\)
B. \([\mathrm{Fe}(\mathrm{CN})_6]^{4-}\) is an octahedral complex ion which is paramagnetic in nature.
C. Removal of \(\mathrm{H}_2 \mathrm{O}\) molecules from \([\mathrm{Ti}(\mathrm{H}_2 \mathrm{O})_6] \mathrm{Cl}_3\) on strong heating converts it to a colourless compound.
D. Crystal Field splitting in Octahedral and Tetrahedral complexes is given by the equation \(\Delta_0=4 / 9 \Delta_t\)

Choose the correct metal/ ion from the brackets which ..........
A. has chemical reactivity similar to that of the first few members of the Lanthanoids \((\mathrm{Zn}, \mathrm{Ca}, \mathrm{Fe}, \mathrm{Cu})\).
B. has stable \(4 \mathrm{f}^7\) electronic configuration, but acts as a strong reducing agent and converts to \(\mathrm{M}^{3+}\) state. \(\left(\mathrm{Eu}^{2+}, \mathrm{Ce}^{2+}, \mathrm{Pr}^{2+}, \mathrm{Dy}^{2+}\right)\)
C. is a colorless ion \(\left(\mathrm{Tm}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Gd}^{3+}, \mathrm{Sm}^{3+}\right)\).
D. shows stable +2 oxidation state and is diamagnetic \((\mathrm{Ce}, \mathrm{Sm}, \mathrm{Ho}, \mathrm{Yb})\)

What is the frequency of the electron in the first orbit of hydrogen atom of orbital radius \(0.5 \times 10^{-10}\)m, if its orbital velocity in that orbit is \(2.2 \times 10^6\ ms^{-1}\).

\(\text { If a compound } \mathrm{X}_3 \mathrm{Y} \text { is } 60 \% \text { ionised in aqueous medium, what is its van't Hoff factor value? }\)

A current flows in a conductor from East to West. The direction of the magnetic field at a point above the conductor is

Pure water is neutral because

If \(A=\left[\begin{array}{cc}k+1 & 2 \\ 4 & k-1\end{array}\right]\) is a singular matrix, then possible values of \(\mathrm{k}\) are