Entry Test MCQ :: Chemical Equilibrium

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Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

[A].	0.0002M HCI	[B].	0.2 mole of NaCI with 0.2 mole of HNO3
[C].	0.4 mole of CH3COOH with 0.4 mole of NaOH	[D].	0.4 mole of NH3 with 0.2 mole of HCI

Answer: Option D