531.

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

• $\sqrt{\mathrm{K}}$

• $\frac{1}{\mathrm{K}}$

• $\sqrt{\frac{1}{\mathrm{K}}}$

• $\frac{1}{{\mathrm{K}}^2}$

For a chemical reaction, temperature is raised from 25° C to 35° C. The value of equilibrium constant, K_p is doubled . The heat of reaction ($\mathrm{\Delta }$H) for the reaction will be :

• 13.834 kcal

• 11.714 kcal

• 10.726 kcal

• 4.312 kcal

4.0 g molecular PCl₅ were heated in a vessel of 6 L volume. At equilibrium state , 50% of PCl₅ is dissociated. The equilibrium constant for the reaction is :

• 0.66 mol L^-1

• 0.33 mol L^-1

• 0.44 mol L^-1

• 0.88 mol L^-1

The pH of blood is :

• greater than 10

• less than 6

• greater than 7 and less than 8

• greater than 8 and less than 9

If K_b of HCN is 4.0 $\times$ 10^-10, then the pH of 2.5 $\times$ 10^-1 molar aqueous HCN is

• 2.0

• 4.7

• 5.0

• 2 x 10^-5