pH of a solution of 10 mL 1N sodium acetate and 50 mL 2

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

How many neutrons are there in nucleus 'X', if it gives 7N14 after two successive β - particle emissions ?

  • 7

  • 10

  • 14

  • 09


2.

2.0 molar solution is obtained, when 0.5 mole solute is dissolved in :

  • 250 ml solvent

  • 250 g solvent

  • 250 ml solution

  • 1000 ml solvent


3.

The energy equivalent to 1 amu., is :

  • 931.1 MeV

  • 1.492 x 1013 erg

  • 1000 J

  • 107 erg


4.

Which particle can be used to change 13Al27 into 15P30 ?

  • Neutron

  • α - particle

  • Proton

  • Deuteron


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5.

What will be the normality of a solution, containing 4.9 g. H3PO4 dissolved in 500 ml water ?

  • 0.3

  • 1.0

  • 3.0

  • 0.1


6.

The solution obtained by adding water to alcohol, shows :

  • +ve deviation from Raoult's law

  • ideal behaviour

  • -ve deviation from Raoult's law

  • application of Henry's law


7.

According to Bohr, the angular momentum of an electron, in any orbit, should be :

  • h/2π

  • nh/2π

  • h/mv

  • 2π/nh


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8.

pH of a solution of 10 mL 1N sodium acetate and 50 mL 2N acetic acid (Ka = 1.8 x 10-5), is approximately :

  • 4

  • 5

  • 6

  • 7


A.

4

Given, Ka = 1.8 x 10-5

[salt] = 1 x 10 = 10 millimol

[Acid] = 2 x 50 = 100 millimol

From Henderson's equation,

pH = pKa + log [salt][acid]

= - log (1.8 x 10-5) + log 10100

= - log 1.8 + 5 + log 10-1

= - 0.2553 + 5 - 1 = 3.7447

= 4


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9.

The pH is less than 7, of the solution of :

  • FeCl3

  • NaCN

  • NaOH

  • NaCl


10.

The values of Ksp for CuS, Ag2S and HgS are 10-31, 1042, 10-54 respectively. The correct order of their solubility in water is :

  • AgS > HgS > CuS

  • HgS > Cus > Ag2S

  • HgS > Ag2S > Cus

  • Ag2S > CuS > HgS


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