Which of the following equations represent de-Broglie relation?

• $\frac{\mathrm{h}}{\mathrm{mv}}=\mathrm{p}$

• $\mathrm{\lambda m} =\frac{\mathrm{v}}{\mathrm{p}}$

• $\mathrm{\lambda }=\frac{\mathrm{h}}{\mathrm{mp}}$

• $\mathrm{\lambda }=\frac{\mathrm{h}}{\mathrm{mv}}$

Which of the following sequences of the energy levels of the subshells related to principal quantum number four (n = 4)?

• s< p< d< f

• s< d< p< f

• s< f< p< d

• p< s< d< f

The correct electronic configuration of iron is

• 1s², 2s² 2p⁶,3s² 3p⁶, 4s², 3d⁶

• 1s², 2s² 2p⁶,3s² 3p⁶, 4s², 3d⁵

• 1s², 2s² 2p⁶,3s² 3p⁶, 4s², 3d⁷

• 1s², 2s² 2p⁶,3s² 3p⁶, 4s², 3d⁵

Which of the electronic shell of the following elements is not rounded?

• He

• Be

• B

• Li

The shape of water molecule according to VSEPR theory, is

• octahedral

• distorted tetrahedral

• trigonal planar

• trigonal bipyramidal

In a radioactive change $\mathrm{R} \stackrel{-\mathrm{\alpha }}{\to } \mathrm{X} \stackrel{-\mathrm{\beta }}{\to } \mathrm{Y} \stackrel{-\mathrm{\beta }}{\to } \mathrm{Z}$. R and Z.

• isotopes

• isobars

• isomers

• isotones

Which one of the following elements belongs to s-block?

• Aluminium

• Chromium

• Carbon

• Potassium

Which one is the correct decreasing order of the ionic radii of the ions?

• N^3- > O^2-> F^- > Na⁺

• N^3-> Na⁺> O^2- > F^-

• Na⁺ >O^2-> N^3-> F^-

• Na⁺> F^-> O^2->N^3-

The chemical decomposition of XY₂ occurs as ${\mathrm{XY}}_2\left(\mathrm{g}\right) \rightleftharpoons \mathrm{XY} \left(\mathrm{g}\right) + \mathrm{Y}\left(\mathrm{g}\right)$. The initial vapour pressure of XY₂ is 600 mm of mercury and at equilibrium it is 800 mm of mercury. Find out the value of K for this reaction when the volume of the system remains constant.

• 50

• 100

• 166.6

• 150

The degree of ionisation of decinormal solution of CH₃COOH is 1.3%. If the log of 1.3 is 0.11, the pH of this solution is

• 2.89

• 3.89

• 4.89

• 0.89