Related InterviewSolutions

• If pKb for fluoride at 25°c is 10.83, the ionization constant of hydrofluoric acid in water at this temperature is?(a) 3.52×10^-3(b) 6.75×10^-4(c) 5.38×10^-2(d) 1.74×10^-5The question was asked in an international level competition.Query is from Ionization of Water, Weak acids and Weak Bases in chapter Water Basics of Biochemistry
• What makes water a liquid at room temperature?(a) Hydrogen bonds between water molecules(b) Covalent bonding(c) Noncovalent interactions(d) Van der Waals forces of attractionI had been asked this question in examination.This intriguing question originated from Weak Interactions in Aqueous Systems in division Water Basics of Biochemistry
• Which of the following is a hypotonic solution?(a) 10% dextrose in water(b) 0.45% sodium chloride(c) 5% dextrose in 0.9% sodium chloride(d) OceansThis question was addressed to me during an interview for a job.Enquiry is from Weak Interactions in Aqueous Systems topic in division Water Basics of Biochemistry
• Which of the following mixture in aqueous solution of equimolar concentration acts as a buffer solution?(a) HNO3 + NaOH(b) H2 SO4 + KOH(c) NH4 OH(excess) + HCl(d) CH3 COOH + NaOH(excess)I have been asked this question in class test.My question is taken from Buffering against pH changes in Biological Systems in section Water Basics of Biochemistry
• Which of the following is an isotonic solution?(a) 0.9% sodium chloride(b) 0.45% sodium chloride(c) Oceans(d) 10% dextrose in waterI had been asked this question during an interview.The question is from Weak Interactions in Aqueous Systems topic in portion Water Basics of Biochemistry
• Buffer capacity is maximum when __________(a) One mole of NH4Cl is added to two moles of NH4OH(b) One mole of NH4Cl is added to one moles of NH4OH(c) One mole of NH4Cl is added to one mole of NaOH(d) One mole of NaCl is added to one mole of NaOHThis question was addressed to me during an online exam.My question is from Buffering against pH changes in Biological Systems in chapter Water Basics of Biochemistry
• The buffer capacity is equal to __________(a) Δn / ΔpH(b) pH / Δn(c) ± 1pKa(d) ± 2pKaThe question was posed to me during an online exam.My doubt stems from Buffering against pH changes in Biological Systems topic in portion Water Basics of Biochemistry
• The bond dissociation energy of O-H bond in a water molecule is _____________(a) 23 kJ/mole(b) 470 kJ/mole(c) 470 J/mole(d) 23 J/moleThis question was posed to me by my school teacher while I was bunking the class.Asked question is from Weak Interactions in Aqueous Systems topic in portion Water Basics of Biochemistry
• Calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30.(a) 3.2(b) 3.3(c) 3.4(d) 3.5I have been asked this question during an interview.This interesting question is from Buffering against pH changes in Biological Systems topic in chapter Water Basics of Biochemistry
• What is the factor that is responsible for salts like NaCl to dissolve in water easily?(a) Decrease in entropy(b) Increase in entropy(c) Increase in enthalpy(d) Decrease in enthalpyThe question was posed to me in quiz.My question is based upon Weak Interactions in Aqueous Systems topic in portion Water Basics of Biochemistry