A solution contains 10 mL of 0.1 N NaOH and 10mL of 0.05 NH2SO4.p

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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


C.

greater than 7

Number of milliequivalents of NaOH = 0.1 x 10 = 1

Number of milliequivalents of H2SO4
= 10 x 0.05 = 0.5

Milliequivalent of H2SO4 will neutralise NaOH so that (1-0.5) = 0.5 milliequivalent of NaOH is left unneutralised.

Therefore, pH of the resulting solution will be greater than seven i.e., pH > 7,


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532.

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


533.

Which of the following acids is monobasic?

  • H3PO3

  • H3PO2

  • H2SO3

  • H3PO4


534.

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 (Ksp = 1.6 x 10-16)

Mn(OH)2 (Ksp = 2 x 10-13

Fe(OH)2 (Ksp = 8 x 10-16)

  • I and IV

  • III and IV

  • II and IV

  • II , III and IV


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535.

The pH of 10-8M NaOH is

  • 8.0

  • 6.0

  • 6.96

  • 7.04


536.

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

NO + 12O2 NO2

  • K

  • 1K

  • 1K

  • 1K2


537.

For a chemical reaction, temperature is raised from 25° C to 35° C. The value of equilibrium constant, Kp is doubled . The heat of reaction (ΔH) for the reaction will be :

  • 13.834 kcal

  • 11.714 kcal

  • 10.726 kcal

  • 4.312 kcal


538.

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


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539.

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


540.

If Kb of HCN is 4.0 × 10-10, then the pH of 2.5 × 10-1 molar aqueous HCN is

  • 2.0

  • 4.7

  • 5.0

  • 2 x 10-5


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