Which of the following sets of quantum numbers is correct for an electron in 3d-orbital?

• n = 3; l = 2; m = -3; s = +$\frac{1}{2}$

• n = 3; l = 3; m = +3; s = -$\frac{1}{2}$

• n = 3; l = 2; m = -2; s = +$\frac{1}{2}$

• n = 3; l = 2; m = -3; s = -$\frac{1}{2}$

If the kinetic energy of a particle is reduced to half, de-Broglie wavelength becomes

• 2 times

• $\frac{1}{\sqrt{2}}$ times

• 4 times

• $\sqrt{2}$ times

Identify the most acidic oxide among the following oxides based on their reaction.

• SO₃

• P₄O₁₀

• Cl₂O₇

• N₂O₅

Match the following:

• A - 4; B - 3; C - 2; D - 1

• A - 3; B - 4; C - 1; D - 2

• A - 2; B - 1; C - 4; D - 3

• A - 4; B - 3; C - 1; D - 2

Which of the following does not have triple bond between the atoms?

• N₂

• CO

• NO

• C${}_2^{2-}$

In which one of the following pairs the two species have identical shape, but differ in hybridisation?

• I${}_3^{-}$, BeCl₂

• NH₃, BF₃

• XeF₂, I${}_3^{-}$

• NH${}_4^{+}$, SF₄

Which one of the following is the wrong statement about the liquid?

• It has intermolecular force of attraction.

• Evaporation of liquids increase with the decrease of surface area.

• It resembles a gas near the cnt1cal temperature.

• lt is an intermediate state between gaseous and solid state.

A carbon compound contains 12.8% of carbon, 21.% of hydrogen and 85.1% of bromine. The molecular weight of the compound is 187.9. Calculate the molecular formula of the compound.

(Atomic weight : H = 1.008; C = 12.0; Br = 79.9)

• CH₃Br

• CH₂Br₂I

• C₂H₄Br₂

• C₂H₃Br₃

3.011 × 10²² atoms of an element weight 1.15 gm. The atomic mass of the element is

• 23

• 10

• 16

• 35.5

Which one of the following is applicable for an adiabatic expansion of an ideal gas?

• $∆$E = 0

• $∆\mathrm{W} = ∆\mathrm{E}$

• $∆\mathrm{W} = -∆\mathrm{E}$

• $∆\mathrm{W} = 0$