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Recent questions tagged medium

A gas X at 1 atm is bubbled through a solution containing a mixture of 1M Y and 1M Z at $25^{\large\circ}C$.If the reduction potential of $Z > Y > X$,then

asked Jul 22, 2014 by sreemathi.v

1 answer

The standard reduction potential values of three metallic cations,X,Y,Z are 0.52,-3.03 and -1.18V,respectively.The order of reducing power of the corresponding metals is

asked Jul 22, 2014 by sreemathi.v

1 answer

Find the equations of the hyperbola satisfying the given conditions : vertices $(\pm 7,0 ) , e = \large\frac{4}{3}$

asked Jul 21, 2014 by thanvigandhi_1

1 answer

Find the equations of the hyperbola satisfying the given conditions : Foci $(\pm 4, 0)$, the latus rectum is of length $12$

asked Jul 21, 2014 by thanvigandhi_1

1 answer

Find the equations of the hyperbola satisfying the given conditions : Foci $(\pm 3\sqrt 5 , 0)$, the latus rectum is of length $8$

asked Jul 21, 2014 by thanvigandhi_1

1 answer

The current of 9.65A is drawn from a Daniell cell for exactly 1h.If molar masses of Cu and Zn are $63.5gmol^{-1}$ and $6.54gmol^{-1}$,respectively,the loss in mass at anode and gain in mass at cathode,respectively,are

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Cr^{3+}]$ to 0.50M,keeping all other concentrations at unity,the emf of the cell would be changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.If $[Cr_2O_7^{2-}]=1.0M,[Cr^{3+}]=0.5M,[Fe^{2+}]=0.5M,[Fe^{3+}]=2.0M$ and $[H_3O^+]=2.0M$,then the cell emf at 298K would be

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[H_3O^{+}]$ to 2.0M, keeping all other concentrations at unity,will change the cell emf by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Increasing $[Fe^{3+}]$ to 2.0M keeping all other concentrations at unity,the emf of the cell is changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

A galvanic cell which makes use of the following reaction at 298K. $Cr_2O_7^{2-}+14H^++6Fe^{2+}\rightarrow 2Cr^{3+}+6Fe^{3+}+7H_2O$.Given : $E^{\large\circ}(Cr_2O_7^{2-},H^+,Cr^{3+}|Pt)=1.33V;E^{\large\circ}(Fe^{3+},Fe^{2+}|Pt)=0.77V$.Reducing $[Fe^{3+}]$ to 0.50M keeping all other concentrations at unity,the emf of the cell will be changed by

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E^{\large\circ}_{Fe^{3+}|Fe}$ and $E^{\large\circ}_{Fe^{2+}|Fe}$ are -0.36V and -0.439V,respectively.The value of $E^{\large\circ}_{Fe^{3+},Fe^{2+}|Pt}$ would be

asked Jul 21, 2014 by sreemathi.v

1 answer

The value of $E_{H_2O|H_2(1\;bar)|Pt}$ at 298K would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E_{H_2O|H_2(1\;bar)|Pt}=0$ at 298K.The pressure of $H_2$ gas would be

asked Jul 21, 2014 by sreemathi.v

1 answer

Given that $E^{\large\circ}$ values of $Ag^+|Ag,K^+|K,Mg^{2+}|Mg$ and $Cr^{3+}|Cr$ are 0.80V,-2.93V,-2.37V,and -0.74V,respectively.Which of the following orders regarding the reducing power of metals is correct?

asked Jul 21, 2014 by sreemathi.v

1 answer

By how much will the potential of half-cell $Cu^{2+}|Cu$ change if the solution is diluted to 100 times at 298K?

asked Jul 21, 2014 by sreemathi.v

1 answer

The reduction potential of hydrogen half-cell will be negative if

asked Jul 21, 2014 by sreemathi.v

1 answer

Find the coordinates of the foci and the vertices, the eccentricity and the length of the latus rectum of the hyperbolas : $49y^2 – 16x^2 = 784$

asked Jul 19, 2014 by thanvigandhi_1

1 answer

Find the coordinates of the foci and the vertices, the eccentricity and the length of the latus rectum of the hyperbolas : $5y^2-9x^2=36$

asked Jul 19, 2014 by thanvigandhi_1

1 answer

Find the equation for the ellipse that satisfies the given conditions : Major axis on the x-axis and passes through the points $(4,3)$ and $(6,2)$.

asked Jul 18, 2014 by thanvigandhi_1

1 answer

Find the equation for the ellipse that satisfies the given conditions : Centre at $(0,0),$ major axis on the y-axis and passes through the points $(3, 2)$ and $(1, 6)$

asked Jul 18, 2014 by thanvigandhi_1

1 answer

Find the equation for the ellipse that satisfies the given conditions : Foci $(\pm 3, 0), a = 4$

asked Jul 18, 2014 by thanvigandhi_1

1 answer

Find the equation for the ellipse that satisfies the given conditions : Length of minor axis $16$, foci $(0, \pm 6).$

asked Jul 18, 2014 by thanvigandhi_1

1 answer

Find the equation for the ellipse that satisfies the given conditions : Length of major axis $26,$ foci $(\pm 5, 0)$

asked Jul 18, 2014 by thanvigandhi_1

1 answer

A body travels 2 m in the first two seconds and $2.2 \;m$ in the next four seconds. What will be its velocity at the end of the seventh second from the start, if acceleration is constant .

asked Jul 18, 2014 by meena.p

1 answer

A Car is able to stop with a uniform retardation of $8 ms^{-2} $ and the driver of the car can react to an emergency in 0.6 s. Calculate overall stopping distance of the car if the speed of car is $72 \;km\;h^{-1}$

asked Jul 18, 2014 by meena.p

1 answer

Equivalent conductivity of $Fe_2(SO_4)_3$ is related to molar conductivity by the expression

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following expressions is correct?

asked Jul 18, 2014 by sreemathi.v

1 answer

Molar conductivity of $Fe_2(SO_4)_3$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

Equivalent conductivity of $Fe_2(SO_4)_3$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

The equilibrium constant of acetic acid in an aqueous solution of concentration $c$ is given by

asked Jul 18, 2014 by sreemathi.v

1 answer

The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to

asked Jul 18, 2014 by sreemathi.v

1 answer

The degree of dissociation $(\alpha)$ of a weak electrolyte $A_xB_x$ is related to Van't hoff factor (i) by the experiment

asked Jul 18, 2014 by sreemathi.v

1 answer

A solution contains 0.1 mol of acetamide in 1 L of glacial acetic acid.When the solution is cooled the first crystals that appeared at the freezing point contain the molecules of

asked Jul 18, 2014 by sreemathi.v

1 answer

Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision?

asked Jul 18, 2014 by sreemathi.v

1 answer

A semipermeable membrane used in the measurement of osmotic pressure of a solution allows the passage of

asked Jul 18, 2014 by sreemathi.v

1 answer

Raoult's law is obeyed by each constituent of a binary liquid solution when

asked Jul 18, 2014 by sreemathi.v

1 answer

A stone is thrown vertically up from the top of a tower with some initial velocity and it arrives on the ground after $t_1$ seconds. Now if the same the stone is thrown vertically down from the top of the same tower with the same initial velocity, it arrives on ground after $t_2$ seconds. In how much time will the stone take to reach the ground if it is dropped from the same tower?

asked Jul 17, 2014 by meena.p

1 answer

A binary liquid solution of chloroform and acetone is prepared.Which of the following statements correctly represents the behaviour of this liquid solution?

asked Jul 17, 2014 by sreemathi.v

1 answer

A binary liquid solution of n-heptane and ethyl alcohol is prepared.Which of the following statements correctly represents the behaviour of this liquid solution?

asked Jul 17, 2014 by sreemathi.v

1 answer

For a dilute solution containing a nonvolatile solute,the molar mass of solute evaluated from the osmotic pressure measurement is given as

asked Jul 17, 2014 by sreemathi.v

1 answer

A metal crystallises into two cubic phases,face centred cubic (FCC) and body centred cubic (BCC),whose unit cell length are 3.5 and $3.0A^{\large\circ}$,respectively.Calculate the ratio of densities of FCC and BCC.

asked Jul 17, 2014 by sreemathi.v

1 answer

Chromium metal crystallises witha body-centred cubic lattice.The length of the unit cell edge is found to be 287pm.Calculate the atomic radius.What would be the density of chromium in $g/cm^3$?

asked Jul 17, 2014 by sreemathi.v

1 answer

A unit cell of sodium chloride has four formula units.The edge length of the unit cell is 0.564nm.What is the density of sodium chloride?

asked Jul 17, 2014 by sreemathi.v

1 answer

The atomic radius of strontium is 215pm and it crystallizes with a cubical closest-packed structure.Calculate the density of strontium.The molar mass of strontium is $87.6gmol^{-1}$.

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the ionic radius of $Cs^+$ if the ionic radius of $Cl^-$ is 181pm.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals.The edge length of unit cell is 412pm.Determine the density of CsCl.Given :M(Cs)=$133gmol^{-1}$

asked Jul 16, 2014 by sreemathi.v

1 answer

The edge length of a cubic unit cell of metallic calcium is 556pm.If the density of calcium is $1.54gcm^{-3}$ and its molar mass is $40.08gmol^{-1}$,calculate the radius of calcium atom

asked Jul 16, 2014 by sreemathi.v

1 answer

Calculate the radius of molybdenum atom if the element crystallizes as body-centred cubic crystals.Given : Density of $Mo=10.3gcm^{-3}$ and molar mass of $Mo=95.94gmol^{-1}$ .

asked Jul 16, 2014 by sreemathi.v

1 answer

The equation of trajectory of a projectile is given by $y=x -\large\frac{x^2}{100}$ Find velocity of projection .

asked Jul 15, 2014 by meena.p

1 answer

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