What is the conjugate base of OH^-?

• O₂

• H₂O

• O^-

• O^-

Among the following acids which has the lowest p_Ka value?

• CH₃COOH

• HCOOH

• (CH₃)₂COOH

• (CH₃)₂COOH

363.

The conjugate base of H₂PO₄^- is

• PO₄^3-

• HPO₄^2-

• H₃PO₄

• H₃PO₄

What is the equilibrium expression for the reaction P₄(s) +5O₂(g)⇌ P₄O₁₀(s)? 

• Kc = [P₄O₁₀] / P₄] [O₂]⁵

• K_c = 1/[O2]⁵

• K_c = [O2] 5

• K_c = [O2] 5

For the reaction, CO(g) + Cl2(g) ⇌ COCl₂(g) the K_p/K_c is equal to

• 1/RT

• 1.0

• √RT

• √RT

The equilibrium constant for the reaction N₂(g) + O₂(g) ⇌ 2NO(g) at temperature T is 4×10^-4. The value of K_c for the reaction NO(g) ⇌ 1/2N₂(g) + 1/2O₂(g) at the same temperature.

• 2.5×10²

• 0.02

• 4 x 10^-4

• 4 x 10^-4

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

• Base	Acid	End Point
  Strong	Strong	Pink to colourless

• Base	Acid	End Point
  Weak	Strong	Colourless to pink

• Base	Acid	End Point
  Strong	Strong	Pinkish Red to Yellow

• Base	Acid	End Point
  Weak	Strong	Yellow to Pinkish Red

The predominant form of histamine present in human blood is (pKa, Histidine = 6.0)

Which of the following are Lewis acids?

• BCl₃ and AlCl₃

• PH₃ and BCl₃

• AlCl₃ and SiCl₄

• PH₃ and SiCl₄

Dissolving NaCN in de-ionised water will result in a solution having

• pH < 7

• pH = 7

• pOH = 7

• pH > 7