At 30°C the solubility of Ag2CO3 (Ksp=8 x 10-12) would be gre

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711.

At 30°C the solubility of Ag2CO3 (Ksp=8 x 10-12) would be greatest in one litre of 

  • 0.05 M Na2CO3

  • 0.05 M AgNO3

  • pure water

  • 0.05 N NH3


D.

0.05 N NH3

Ag2CO3  2Ag++CO32-

Due to the common ion effect, the solubility decreases, so the solubility of Ag2CO3 would be greatest in 1 L of 0.05 M NH3 due to the absence of common ion either Ag+ or CO32-.

 Ag+ from complex with NH3                      Ag++2NH3[Ag(NH3)2]+


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712.

Which of the following can behave as an acid as well as base ?

  • HCl

  • H2SO4

  • H2O

  • NH3


713.

Ammonium ion is

  • a conjugate acid

  • a conjugate base

  • neither acid nor a base

  • both an acid and a base


714.

Which of the following oxide does not form acidic aqueous solution?

  • N2O3

  • NO2

  • N2O5

  • NO


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715.

Which of the following salt does not get hydrolysed in water?

  • KClO4

  • NH4Cl

  • CH3COONa

  • None of these


716.

In the reaction: H2 + I2 → HI

In a 2L flask 0.4 moles of each H2 and I2 are taken. At equilibrium 0.5 moles of HI are formed. What will be the value of equilibrium constant Kc?

  • 20.2

  • 25.4

  • 0.284

  • 11.1


717.

Which of the following is a Lewis base ?

  • NaOH

  • NH3

  • BCl3

  • All of these


718.

Which of the following dissolves in hot conc. NaOH solution?

  • Fe

  • Zn

  • Cn

  • Ag


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719.

Which will make basic buffer?

  • 100mL of 0.1 M CH3COOH + 100mL of 0.1M NaOh

  • 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH

  • 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

  • 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH


720.

Conjugate base for BrÖnsted acids H2O and HF are :

  • H3O+ and F-, respectively

  • OH- and F-, respectively

  • H3O+ and  H2F+, respectively

  • OH- and H2F+, respectively


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