Which one of the following species is diamagnetic in nature?

• He₂⁺

• H₂

• H₂⁺

• H₂⁺

For a spontaneous reaction the ∆G, equilibrium constant (K) and E^o_cell will be respectively 

• -ve, >1, +ve

• +ve, >1, -ve

• -ve, <1, -ve

• -ve, <1, -ve

Consider the reaction: N₂ +3H₂ → 2NH₃ carried out at constant temperature and pressure. If ∆H and ∆U are the enthalpy and internal energy changes for the reaction, which of the following expressions is true? 

• ∆H = 0

• ∆H = ∆U

• ∆H < ∆U

• ∆H < ∆U

4.

Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

• The most probable speed increases

• The fraction of the molecules with the most probable speed increases

• The distribution becomes broader

• The distribution becomes broader

The exothermic formation of ClF₃ is represented by the equation


Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃?

• Increasing the temperature

• Removing Cl₂

• Increasing the volume of the container

• Increasing the volume of the container

For the reaction



When K_p and K_c are compared at 184^oC, it is found that

• K_p is greater than K_c

• K_p is less than K_c

• K_p = K_c

• K_p = K_c

Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be

• 3.98 x 10⁸

• 3.88 x 10⁶

• 3.68 x 10^-6

• 3.68 x 10^-6

If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will 

• Decrease twice

• Increase two fold

• Remain unchanged

• Remain unchanged

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic acid and electric fields?

(a) n = 1, l = 0, m = 0
(b) n = 2, l = 0, m = 0
(c) n = 2, l = 1, m = 1
(d) n = 3, l = 2, m = 1
(e) n = 3, l = 2, m = 0

• (a) and (b)

• (b) and (c)

• (c) and (d)

• (c) and (d)

The number and type of bonds between two carbon atoms in calcium carbide are

• One sigma, one pi

•  One sigma, two pi

• Two sigma, one pi

• Two sigma, one pi