The correct order of the acidity of following acids is-CH3COOH, H

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 Multiple Choice QuestionsMultiple Choice Questions

231.

A chemical reaction is in equilibrium when

  • the reactants are completely transformed into products

  • the rate of forward reaction is equal to the rate of backward reaction

  • the formation of products is minimised

  • equal amount of reactants and products are present


232.

For the following gaseous reaction, H2 + I2HI, the equilibrium constant

  • Kp > Kc

  • Kp< Kc

  • Kp= Kc

  • Kp= 1/Kc


233.

According to Le-Chatelier's principle which of the following factors influence a chemical system?

  • Concentration only

  • Pressure only

  • Temperature only

  • Concentration, pressure and temperature


234.

The pH of water decreases with?

  • increase in temperature

  • increase in pressure

  • decrease in temperature

  • decrease in pressure


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235.

The aqueous solution of which one of the following is basic?

  • HOCl

  • NaHSO4

  • NH4NO3

  • NaOCl


236.

The pH of 10-7 M NaOH is

  • 7.01

  • between 7 and 8

  • between 9 and 10

  • greater than 10


237.

If H+ concentration of fruit juice is 3.3 × 10-2, then its pH will be

  • 4.8 basic

  • 4.8 neutral

  • 4.8 acidic

  • 1.6 acidic


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238.

The correct order of the acidity of following acids is-

CH3COOH, HCOOH, Cl-CH2COOH, F-CH2COOH, (Cl2)CHCOOH

  • Cl2CHCOOH > F-CH2COOH > Cl-CH2COOH > HCOOH > CH3COOH

  • F-CH2COOH > Cl-CH2COOH > Cl2CHCOOH > HCOOH > CH3COOH

  • HCOOH > CH3COOH > Cl-CH2COOH > Cl2CHCOOH > F-CH2COOH

  • None of the above


A.

Cl2CHCOOH > F-CH2COOH > Cl-CH2COOH > HCOOH > CH3COOH

Group or atom attached with -COOH group shows positive inductive effect increases electron density on oxygen atom, which suppress the ionisation of H+, hence, acidic strength decreases.

Group or atom attached with -COOH group shows negative inductive effect decreases electron density on oxygen atom, which facilitate the ionisation of H+, hence acidic strength increases.

Sequence of group shows negative inductive effect-

-CHCl2 > -CH2F > -CH2Cl

-CH3 group shows positive inductive effect and -H does not show any effect.

Therefore, the correct order is-

Cl2CHCOOH > F-CH2COOH > Cl-CH2COOH > HCOOH > CH3COOH


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239.

Zwitter ion is

  • a dipolar ion

  • ion formed from amino acid

  • internal salt

  • All of the above


240.

Solubility product of pure PbCl2 will be

  • Ksp = S2

  • Ksp = 4S3

  • Ksp = 108 S5

  • Ksp = S


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