Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

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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12.

In an adiabatic process which of the following is true?

  • q = +W

  • q = 0

  • E = q

  • pV = 0


13.

Zwitter ion is

  • a dipolar ion

  • ion formed from amino acid

  • internal salt

  • All of the above


14.

Equation log K2K1 = H2.303 R T2 -T1T1 . T2, n is

  • van der Waals' equation

  • Kirchoffs equation

  • Gas equation

  • van't Hoff equation


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15.

Number of α and β emitted in the reaction, 92U238 → 82Pb206 are

  • 6α and 8β

  • 8α and 6β

  • 6α and 4β

  • 4α and 6β


16.

According to MOT which of the following is correct for potassium hexa cyano ferrate (III)?

  • It is octahedral complex.

  • t2g orbital contains the e- of metal.

  • For iron, overlapping between empty orbitals and ligand orbitals takes place.

  • All of the above


17.

Solubility product of pure PbCl2 will be

  • Ksp = S2

  • Ksp = 4S3

  • Ksp = 108 S5

  • Ksp = S


18.

Which of the following statement is correct?

  • Basic nature increases on increasing pH

  • Basic nature decreases on increasing pH

  • Acidic nature increases on increasing pH

  • None of the above


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19.

The required condition for an ideal solution is

  • Hmix = 0

  • Vmix ≠ 0

  • pA ≠ p°A XA

  • Hmix > 1


20.

Which of the following is an electron deficient compound?

  • B2H6

  • NH3

  • C2H6

  • CCl4


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