At 30$°$C the solubility of Ag₂CO₃ (K_sp=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

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

• HCl

• H₂SO₄

• H₂O

• NH₃

Ammonium ion is

• a conjugate acid

• a conjugate base

• neither acid nor a base

• both an acid and a base

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

• N₂O₃

• NO₂

• N₂O₅

• NO

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

• KClO₄

• NH₄Cl

• CH₃COONa

• None of these

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 K_c?

• 20.2

• 25.4

• 0.284

• 11.1

Which of the following is a Lewis base ?

• NaOH

• NH₃

• BCl₃

• All of these

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

• Fe

• Zn

• Cn

• Ag

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

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