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Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
(i) 1.2% sodium chloride solution?
(ii) 0.4% sodium chloride solution?
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure
3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).
(Given : Molar mass of benzoic acid = 122 g mol−1, Kf for benzene = 4.9 K kg mol−1)
Concept: Abnormal Molar Masses
Define the following terms : Molarity
Concept: Solubility > Solubility of a Solid in a Liquid
A solution of glucose (molar mass = 180 g mol–1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution ? (Density of solution = 1.2 g mL–1)
Concept: Colligative Properties and Determination of Molar Mass - Introduction
Define Molality.
Concept: Expressing Concentration of Solutions
Define reverse osmosis.
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure
Define reverse osmosis.
Concept: Colligative Properties and Determination of Molar Mass > Osmosis and Osmotic Pressure
Write mathematical equation of first law of thermodynamics for Isochoric process.
Concept: Chemical Thermodynamics and Energetic > First Law of Thermodynamics
Define the Enthalpy of atomization
Concept: Chemical Thermodynamics and Energetic > Internal Energy and Enthalpy
State Third law of thermodynamics. Give ‘two’ uses.
Concept: Chemical Thermodynamics and Energetic > Second and Third Law of Thermodynamics
Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.
Concept: Chemical Thermodynamics and Energetic > First Law of Thermodynamics
Define molar solubility. Write it’s unit.
Concept: Solubility Product > Solubility product
From the given cells:
Lead storage cell, Mercury cell, Fuel cell and Dry cell
Answer the following:
(i) Which cell is used in hearing aids?
(ii) Which cell was used in Apollo Space Programme?
(iii) Which cell is used in automobiles and inverters?
(iv) Which cell does not have long life?
Concept: Batteries > Primary Batteries
Calculate e.m.f of the following cell at 298 K:
2Cr(s) + 3Fe2+ (0.1M) → 2Cr3+ (0.01M) + 3 Fe(s)
Given: E°(Cr3+ | Cr) = – 0.74 VE° (Fe2+ | Fe) = – 0.44 V
Concept: Galvanic or Voltaic Cells - Introduction
Following reactions occur at cathode during the electrolysis of aqueous silver chloride solution :
`Ag^+(aq)+e^(-)rarrAg(s)" "" "" "E^@=+0.80V`
`H^+(aq)+e^(-)rarr1/2H_2(g)" "" "" " E^@=0.00V`
On the basis of their standard reduction electrode potential (E°) values, which reaction is feasible at the cathode and why ?
Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Why conductivity of an electrolyte solution decreases with the decrease in concentration ?
Concept: Conductance of Electrolytic Solutions > Variation of Conductivity and Molar Conductivity with Concentration
Calculate emf of the following cell at 25 °C :
Fe|Fe2+(0.001 M)| |H+(0.01 M)|H2(g) (1 bar)|Pt (s)
E°(Fe2+| Fe)= −0.44 V E°(H+ | H2) = 0.00 V
Concept: Galvanic or Voltaic Cells - Introduction
Calculate ΔrG° for the reaction
Mg (s) + Cu2+ (aq) → Mg2+ (aq) + Cu (s)
Given : E°cell = + 2.71 V, 1 F = 96500 C mol–1
Concept: Relation Between Gibbs Energy Change and Emf of a Cell
Three moles of an ideal gas are expanded isothermally from 15 dm3 to 20 dm3 at a constant external pressure of 1.2 bar, calculate the amount of work in Joules.
Concept: Expression for Pressure-volume (PV) Work
Define “zero order reaction”.
Concept: Factors Influencing Rate of a Reaction
