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

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 Multiple Choice QuestionsMultiple Choice Questions

31.

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

32.

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


33.

Which of the following are Lewis acids?

  • BCl3 and AlCl3

  • PH3 and BCl3

  • AlCl3 and SiCl4

  • PH3 and SiCl4


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34.

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

  • pH < 7

  • pH = 7

  • pOH = 7

  • pH > 7


D.

pH > 7

Since, on dissolving NaCN in de-ionised water, following reaction takes place.

CN- + H2 HCN + OH-

 CN- ions come from the salt of strong base and weak acid.

 The solution becomes basic and pH > 7.


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35.

PbCl2 is insoluble in cold water. Addition of HCl increases its solubility due to

  • formation of soluble complex anions like [PbCl3]-

  • oxidation of Pb(II) to PB(IV)

  • formation of [Pb(H2O)6]2+

  • formation of polymeric lead complexes


36.

Of the following compounds, which one is the strongest Bronsted acid in a aqueous solution?

  • HClO3

  • HClO2

  • HOCl

  • HOBr


37.

The yield of acetanilide in the reaction (100% conversion) of 2 moles of aniline with 1 mole of acetic anhydride is

  • 270 gm

  • 135 gm

  • 67.5 gm

  • 177 gm


38.

Equilibrium constants for the following reactions at 1200 K are given

2H2O (g)  2H2 (g) + O2 (g)    [K1 = 6.8 × 10-8]

2CO2 (g)  2CO (g) + O2 (g)    [K2 = 1.6 × 10-6]

The equilibrium constant for the reaction?

H2(g) + CO2(g)  CO (g) + H2O (g)

at 1200 K will be

  • 0.05

  • 20

  • 0.2

  • 5.0


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39.

Which of the following solutions will turn violet when a drop of lime juice is added to it?

  • A solution of NaI

  • A solution mixture of KI and NaIO3

  • A solution mixture of NaI and KI

  • A solution mixture of KIO3 and NaIO3


40.

The molar solubility (in mol L-1) of a sparingly soluble salt MX4 is 'S'. The corresponding solubility product is Ksp in terms of 'Ksp' is given by the relation

  • S=Ksp1281/4

  • S=Ksp2561/5

  • S=(256 Ksp)1/5

  • S=(128 Ksp)1/4


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