Points I, II and III in the following plot respectively correspond to (V_mp: most probale velocity) 

• V_mp of N₂ (300K); V_mp of O₂(400K); V_mp of H₂ (300K)

• V_mp of N₂ (300K); V_mp of H₂(300K); V_mp of O₂ (400K)

• V_mp of H₂ (300K); V_mp of N₂(300K); V_mp of O₂ (400K)

• V_mp of O₂ (400K); V_mp of N₂(400K); V_mp of H₂ (300K)

The pH of a 0.02 M NH₄Cl solution will be: [ given K_b(NH₄OH) = 10^-5 and log 2= 0.301]

• 5.35

• 2.65

• 4.65

• 4.35

For the reaction, 2SO₂(g) + O₂(g) $\rightleftharpoons$2SO₃(g), ΔH= -57. 2kJ mol^-1 and K_c = 1.7 × 10⁶. Which of the following statement is INCORRECT ?

• The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required

• The equilibrium constant decreases as the temperature increases.

• The equilibrium will shift in forward direction as the pressure increase

• Volume will not affect the equilibrium constant

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are:

• Paschen and Pfund

• Lyman and Paschen

• Brackett and Pfund

• Balmer and Brackett

The difference between ΔH and ΔU ( ΔH- ΔU), when the combustion of one mole heptane(I) is carried out a temperature T, is equal to:

• -3RT

• -4RT

• 3RT

• 4R

The major product obtained in the given reaction is:

The major product obtained in the given reaction is:

Which of the these factors does not govern the stability of a conformation in acyclic compounds:

• Torsional strain

• Steric interaction

• Electrostatic forces of interaction

• Angle strain

Air pollution that occurs in sunlight is :

• Oxidising smog

• Reducing smog

• Fog

• Acid rain

The noble gas that does NOT occur in the atmosphere is :

• Ne

• He

• Kr

• Ra