You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Faraday's Second Law

Zn amalgam is...

Question

$Z n$ amalgam is prepared by the electrolysis of aqueous $Z n C l_{2}$ using $H g$ cathode (9g). How much current is to be passed through $Z n C l_{2}$ solution for 1000 seconds to prepare a $Z n$ amalgam with 25% $Z n$ by weight? ( $Z n =$ 65.4)

5.6 amp

No worries! We‘ve got your back. Try BYJU‘S free classes today!

7.2 amp

No worries! We‘ve got your back. Try BYJU‘S free classes today!

8.85 amp

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

11.2 amp

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C 8.85 amp
Let x gm of $Z n$ deposit on 9 gm of Hg
% of $Z n$ in Amalgam $= \frac{m_{Z n} \times 100}{m_{Z n} + m_{H g}} = \frac{x}{9 + x} \times 100 = 25$
$∴ x = 3 g m$
$E q u i v a l e n c e o f Z n = \frac{3 \times 2}{65. 4}$
$\frac{Q}{2 F} = \frac{i t}{2 F}$
$C u r r e n t, i = E_{e q} \times \frac{F}{t} = \frac{6}{65.4} \times \frac{96500}{1000} = 8.85$ amp

Suggest Corrections

Similar questions

Z n

Amalgam is prepared by the electrolysis of aqueous

Z n C l_{2}

using

H g

cathode (9 gm). How much current should be passed through

Z n C l_{2}

solution for 1000 seconds to prepare a

Z n

amalgam with 25%

Z n

by weight ?

(Z n

atomic weight

= 65.4)

Q. Cd amalgam is prepared by electrolysis of a solution of

C d C l_{2}

using a mercury cathode. Find how long (in minutes) should a current of 5 ampere is passed in order to prepare 12%

C d - H g

amalgam on a cathode of 2.56 g mercury? At. wt. of Cd = 112.40.

Q. Cadmium amalgam is prepared by electrolysis of the solution of

{C d C l}_{2}

using a mercury cathode. How long should a current of

4 A

be passed in order to prepare

10

by mass Cd in Cd Hg amalgam on the cathode of 4.5 g Hg? (atomic mass of Cd = 112)

Q. Cadmium amalgam is prepared by electrolysis of a solution of

C d C l_{2}

using a mercury cathode. Find how long a current of

5

ampere should be passed in order to prepare

12

C d - H g

amalgam on a cathode of

2 g

mercury. At. mass of

C d = 112.40

C d

amalgam is prepared by electrolysis of a solution

C a C l_{2}

using a mercury cathode. The time (in a sec) for which a current of

5 A

should be passed in order to prepare

12

C d - H g

amalgam on a cathode of

2 g H g

is ______

Atomic weight of

C d = 112.4

. (write the value to the nearest integer)

Join BYJU'S Learning Program

Zn amalgam is prepared by the electrolysis of aqueous ZnCl2 using Hg cathode (9g). How much current is to be passed through ZnCl2 solution for 1000 seconds to prepare a Zn amalgam with 25% Zn by weight? (Zn= 65.4)

The correct option is C 8.85 ampLet x gm of Zn deposit on 9 gm of Hg% of Zn in Amalgam =mZn×100mZn+mHg=x9+x×100=25∴x=3gmEquivalence of Zn=3×265.4 Q2F=it2FCurrent, i=Eeq×Ft=665.4×965001000=8.85 amp

$Z n$ amalgam is prepared by the electrolysis of aqueous $Z n C l_{2}$ using $H g$ cathode (9g). How much current is to be passed through $Z n C l_{2}$ solution for 1000 seconds to prepare a $Z n$ amalgam with 25% $Z n$ by weight? ( $Z n =$ 65.4)