The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x 10¹⁷ nms^-1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 10¹⁵ s^-1?

• 10

• 25

• 50

• 75

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, l = 1 and m =-1.

• 10

• 6

• 4

• 2

Based on equation $\mathrm{E} = -2.178 \times {10}^{-18} \mathrm{J} \left(\frac{{\mathrm{Z}}^2}{{\mathrm{n}}^2}\right)$ certain conclusions are written. Which of them is not correct?

• The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.

• Larger the value of n, the larger is the orbit radius

• Equation can be used to calculate the change in energy when the electron changes orbit.

• For n = 1 the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0M HNO₃ ? The concentrated acid is 70% HNO₃.

• 45.0 g conc. HNO₃

• 90.0 g con. HNO₃

• 70.0 g conc. HNO₃

• 54.0 g conc. HNO₃

Maximum deviation from ideal gas is expected from

• H₂(g)

• N₂(g)

• CH₄(g)

• NH₃(g)

Dipole-induced dipole interactions are present in which of the following pairs?

• H₂O and alcohol

• Cl₂ and CCl₄

• HCl and He atoms

• SiF₄ and He atoms

Which of  the following structure is similar to graphite?

• CO

• O₂^-

• CN^-

• NO⁺

8.

XeF₂ is isostructural with

• TeF₂

• ICl₂^-

• SbCl₃

• BaCl₂

An excess of AgNO₃ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

• 0.001

• 0.002

• 0.003

• 0.01

Which ofthese is least likely to act as a Lewis base?

• CO

• F^-

• BF₃

• PF₃