Equilibrium

The pH of a 10^-10M - NaOH solution is

• 10

• 7.01

• 6.99

• 4

Which has minimum solubility?

• Bi₂S₃

• Ag₂S

• CoS

• PbS

NaOH(aq), HCl(aq), and NaCl(aq) concentration of each is 10^-3 M. Their pH will be respectively

• 10, 6, 2

• 11, 3, 7

• 10, 3, 7

• 10, 4, 7

On adding A to the reaction at equilibrium, AB (s) $\rightleftharpoons$ A(g) + B(g) the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

• 1/2 of its original value

• 1/4 of its original value

• 1/8 of its original value

• Twice its original value

A solution contains 10 mL of 0.1 N NaOH and 10mL of 0.05 NH₂SO₄.pH of this solution is:

• zero

• less than 7

• greater than 7

• 7

Fear or excitement, generally cause one to breathe rapidly and it results in the decrease of concentration of CO₂ in blood. In what way it will change pH of blood?

• pH will increase

• pH will decrease

• No change

• pH will be 7

Which of the following acids is monobasic?

• H₃PO₃

• H₃PO₂

• H₂SO₃

• H₃PO₄

A litre solution containing NH₄Cl and NH₄OH has hydroxide ion concentration of 10^-6 mol L^-1. Which of the following hydroxide could be precipitated when the solution is added to 1L solution of 0.1M metal ions?

Ba(OH)₂ (Ksp = 5 x 10^-3)

Ni(OH)₂ (K_sp = 1.6 x 10^-16)

Mn(OH)₂ (K_sp = 2 x 10^-13) 

Fe(OH)₂ (K_sp = 8 x 10^-16)

• I and IV

• III and IV

• II and IV

• II , III and IV

The pH of 10^-8M NaOH is

• 8.0

• 6.0

• 6.96

• 7.04

For the reaction, 2NO₂ 2NO + O₂, the value of K_p is equal to K. What will the value of K_p for reaction,

NO + $\frac{1}{2}$O₂ $\to$NO₂

• $\sqrt{\mathrm{K}}$

• $\frac{1}{\mathrm{K}}$

• $\sqrt{\frac{1}{\mathrm{K}}}$

• $\frac{1}{{\mathrm{K}}^2}$