Which one ofthe following is a correct set?

• H₂O, sp³, angular

• H₂O, sp², linear

• NH₄⁺, dsp²,square planar

• CH₄, dsp², tetrahedral

Which one of the following represents the graph between log p (on Y-axis) and 1/T  on X-axis)? (p = vapour pressure of a liquid, T = absolute temperature).

What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulphur into sulphur dioxide?

• 11.2

• 22.4

• 33.6

• 44.8

If a gas contains only three molecules that move with velocities of 100, 200, 500 ms^-1. What is the rms velocity of that gas in ms^-1?

• 100$\frac{\sqrt{8}}{3}$

• 100√30

• 100√10

• 800/3

When 10 g of methane is completely burnt in oxygen, the heat evolved is 560 kJ. What is the heat of combustion (in kJ mol^-1) of methane?

• -1120

• -968

• -896

• -560

If the ionic product of water (K_w) is 1.96 x 10^-14 at 35°C, what is its value at 10°C?

• 1.96 × 10^-14

• 3.92 × 10^-14

• 2.95  × 10^-14

• 1.96 × 10^-13

If the electron of a hydrogen atom is present in the first orbit, the total energy of the electron is

• $\frac{-{\mathrm{e}}^2}{\mathrm{r}}$

• $\frac{-{\mathrm{e}}^2}{{\mathrm{r}}^2}$

• $\frac{-{\mathrm{e}}^2}{2\mathrm{r}}$

• $\frac{-{\mathrm{e}}^2}{2{\mathrm{r}}^2}$

If the wavelength of an electromagnetic radiation is 2000 Å, what is its energy in ergs?

• 9.94 × 10^-12

• 9.94 × 10^-19

• 4.97 × 10^-12

• 4.97 × 10^-19

If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the percent ionic character of the bond ?

• 10.66

• 12.33

• 16.66

• 19.33

Which one of the following reactions occur at the anode, in the Castner process of extracting sodium metal ?

• H₂ → 2H⁺ + 2e^-

• 2Cl^- → Cl₂ + 2e^-

• 4OH^- → 2H₂O + O₂ + 4e^-

• Na⁺ + e^- → Na