What is the maximum number of orbitals that can be identified with the following quantum numbers?

n=3, l =1, m₁ = 0

• 1

• 2

• 3

• 3

Calculate the energy in joule corresponding to light of wavelength 45mm: (Planck's constant h=6.63 x10^-34)Js; speed of light c= 3 x 10⁸ ms^-1)

• 6.67 x 10¹⁵

• 6.67 x 10¹¹

• 4.42 x 10^-15

• 4.42 x 10^-15

3.

Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27⁰ C in identical conditions. The ratio of the volumes of gases H₂ : O₂: CH₄ would be 

• 8:16:1

• 16:8:1

• 16:1:2

• 16:1:2

Which of the following salts will give highest pH in water?

• KCl

• NaCl

• Na₂CO₃

• Na₂CO₃

When 22.4 L of H₂ (g) is mixed with 11.2 L of Cl₂ (g), each of at STP, the moles of HCl (g) formed is equal to

• 1 mole of HCl (g)

• 2 moles of HCl (g)

• 0.5 mole of (g) 

• 0.5 mole of (g) 

Which of the following statement is correct for the spontaneous absorption of a gas?

• ΔS is negative and therefore, ΔH should be highly positive
  
• ΔS is negative and therefore, ΔH should be highly negative
• ΔS is positive and therefore, ΔH should be negative
• ΔS is positive and therefore, ΔH should be negative

For the reversible reaction,


the equilibrium shifts in the forward direction

• by increasing the concentration of NH₃ (g)

• by decreasing the pressure

• by decreasing the concentrations of N₂ (g)  and H₂(g)

• by decreasing the concentrations of N₂ (g)  and H₂(g)

For the reaction X₂O₄ (l) -->  2XO₂ (g) ΔU = 2.1 kcal, ΔS = 20 cal K^-1 at 300 K hence ΔG is

• 2.7 kcal

• -2.7kcal

• 9.3 kcal 

• 9.3 kcal 

For a given exothermic reaction K_p and K_p' are the equilibrium constant at temperatures T₁ and T₂ respectively. Assuming that heat of reaction si constant in temperature range between T₁ and T₂ it is readily observed that

• K_p> K_p'

• K_p< K_p'

• K_p = K_p'

• K_p = K_p'

which of the following orders of ionic radii is correctly represented?

• H^- > H >H⁺

• Na⁺ >F^- >O^2-

• F^- > O^2->Na⁺

• F^- > O^2->Na⁺