Question 25

Define fuel cell and write its two advantages.

Answer

Experts are working on it..

- Q:-
Give simple chemical tests to distinguish between the following pairs of compounds.

(i) Propanal and Propanone

(ii) Acetophenone and Benzophenone

(iii) Phenol and Benzoic acid

(iv) Benzoic acid and Ethyl benzoate

(v) Pentan-2-one and Pentan-3-one

(vi) Benzaldehyde and Acetophenone

(vii) Ethanal and Propanal

- Q:- Henry's law constant for CO
_{2}in water is 1.67 x 10^{8}Pa at 298 K. Calculate the quantity of CO_{2}in 500 mL of soda water when packed under 2.5 atm CO_{2 }pressure at 298 K.">Henry's law constant for CO

_{2}in water is 1.67 x 10^{8}Pa at 298 K. Calculate the quantity of CO_{2}in 500 mL of soda water when packed under 2.5 atm CO_{2 }pressure at 298 K. - Q:- H
_{2}S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H_{2}S in water at STP is 0.195 m, calculate Henry's law constant.">H

_{2}S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H_{2}S in water at STP is 0.195 m, calculate Henry's law constant. - Q:-
How the following conversions can be carried out?

(i) Propene to propan-1-ol

(ii) Ethanol to but-1-yne

(iii) 1-Bromopropane to 2-bromopropane

(iv) Toluene to benzyl alcohol

(v) Benzene to 4-bromonitrobenzene

(vi) Benzyl alcohol to 2-phenylethanoic acid

(vii) Ethanol to propanenitrile

(viii) Aniline to chlorobenzene

(ix) 2-Chlorobutane to 3, 4-dimethylhexane

(x) 2-Methyl-1-propene to 2-chloro-2-methylpropane

(xi) Ethyl chloride to propanoic acid

(xii) But-1-ene to n-butyliodide

(xiii) 2-Chloropropane to 1-propanol

(xiv) Isopropyl alcohol to iodoform

(xv) Chlorobenzene to p-nitrophenol

(xvi) 2-Bromopropane to 1-bromopropane

(xvii) Chloroethane to butane

(xviii) Benzene to diphenyl

(xix) tert-Butyl bromide to isobutyl bromide

(xx) Aniline to phenylisocyanide

- Q:-
Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

- Q:- The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.">
The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

- Q:- A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL
^{-1}, then what shall be the molarity of the solution?">A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL

^{-1}, then what shall be the molarity of the solution? - Q:-
Calculate the mass of urea (NH

_{2}CONH_{2}) required in making 2.5 kg of 0.25 molal aqueous solution. - Q:- A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K.">
A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of 5% glucose in water if freezing point of pure water is 273.15 K.

- Q:- Calculate the mass of a non-volatile solute (molar mass 40 g mol
^{-1}) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.">Calculate the mass of a non-volatile solute (molar mass 40 g mol

^{-1}) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.

- Q:-
How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na

_{2}CO_{3}and NaHCO_{3}containing equimolar amounts of both? - Q:- The resistance of a conductivity cell containing 0.001M KCl solution at 298 K is 1500 Ω. What is the cell constant if conductivity of 0.001M KCl solution at 298 K is 0.146 x 10
^{-3 }S cm^{-1}.">The resistance of a conductivity cell containing 0.001M KCl solution at 298 K is 1500 Ω. What is the cell constant if conductivity of 0.001M KCl solution at 298 K is 0.146 x 10

^{-3 }S cm^{-1}. - Q:-
Why is BiH3 the strongest reducing agent amongst all the hydrides of Group 15 elements?

- Q:- Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.">
Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

- Q:- An antifreeze solution is prepared from 222.6 g of ethylene glycol (C
_{2}H_{6}O_{2}) and 200 g of water. Calculate the molality of the solution. If the density of the solution is 1.072 g mL^{-1}, then what shall be the molarity of the solution?">An antifreeze solution is prepared from 222.6 g of ethylene glycol (C

_{2}H_{6}O_{2}) and 200 g of water. Calculate the molality of the solution. If the density of the solution is 1.072 g mL^{-1}, then what shall be the molarity of the solution? - Q:-

0 20 40 60 80*T*/°C

0.0787 1.70 25.7 178 2140*10*^{5}X K /S^{-1}Draw a graph between ln

*k*and 1/*T*and calculate the values of*A*and*E*_{a}.Predict the rate constant at 30 º and 50 ºC.

The rate constant for the decomposition of N

_{2}O_{5}at various temperatures is given below:*T*/°C0 20 40 60 80 *10*^{5}X K /S^{-1}0.0787 1.70 25.7 178 2140 Draw a graph between ln

*k*and 1/*T*and calculate the values of*A*and*E*_{a}.Predict the rate constant at 30 º and 50 ºC.

- Q:- The following data were obtained during the first order thermal decomposition of SO
_{2}Cl_{2}at a constant volume.SO

_{2}Cl_{2(}g) → SO_{2(}g) + Cl_{2}(g)Experiment Time/s

^{ - 1}Total pressure/atm 1 0 0.5 2 100 0.6 Calculate the rate of the reaction when total pressure is 0.65 atm

">**.**The following data were obtained during the first order thermal decomposition of SO

_{2}Cl_{2}at a constant volume.SO

_{2}Cl_{2(}g) → SO_{2(}g) + Cl_{2}(g)Experiment Time/s

^{ - 1}Total pressure/atm 1 0 0.5 2 100 0.6 Calculate the rate of the reaction when total pressure is 0.65 atm

**.** - Q:-
Give two examples to show the anomalous behaviour of fluorine.

- Q:- Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.
(i)Ethanal, Propanal, Propanone, Butanone.

(ii)Benzaldehyde,

*p*-Tolualdehyde,*p*-Nitrobenzaldehyde, Acetophenone.

">*Hint*:Consider steric effect and electronic effect.Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions.

(i)Ethanal, Propanal, Propanone, Butanone.

(ii)Benzaldehyde,

*p*-Tolualdehyde,*p*-Nitrobenzaldehyde, Acetophenone.*Hint*:Consider steric effect and electronic effect. - Q:- Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.">
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Copyright © 2020 saralstudy.com. All Rights Reserved.