Charge and Current

Q. During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is approximately:

1. 220 minutes
2. 330 minutes
3. 55 minutes
4. 110 minutes

Q. during the electrolysis of molten sodium chloride the time required to produce 0.10 mol of chlorine gas using a current of 3 ampere is- 1) 55 min. 2) 110 min. 3) 220 min. 4) 330 min.

Q. 37. The ionic conductance of Ba2+ and Cl- are respectively 127 and 76 ohm-1 sq.cm at infinite dilution. The equivalent conductance of Bacl2 at infinite dilution will be (in ohm-1 sq.cm)

Q. Degree of dissociation of 3 binary electrolytes are 0.6 , 0.2 , 1.0 in a solution having same mole fraction of water. The ratio of lowering in vapor pressure of their solution is: 1) 0.8:0.6:1 2) 0.3:0.5:0.2 3) 0.2:0.4:0.1 4) 1:2:0.5

Q.

The work function of a metal is

Q. A $5ampere$ current is passed through a solution of zinc sulphate for $40minutes$. The amount of zinc deposited at the cathode is:

1. $0.4065g$
2. $65.04g$
3. $40.65g$
4. $4.065g$

Q.

What voltage will electrolysis remove rust?

Q. How much quantity of electricity has to be passed through 200 ml of 0.5M $CuS{O}_4$ solution to completely deposit copper?

1. $9.65\times {10}^{4}C$
2. $1.93\times {10}^4$
3. $3.86\times {10}^{5}C$
4. $2.895\times {10}^{5}C$

Q. The electrochemical equivalent of silver 0.0011180 g. When an electric current of0.5 ampere is passed through an aqueous silver nitrate solution for 200 sec., the amount of silver deposited is(1) 1.1180 g(3) 5.590g) 0.11180 g(4) 0.5590 g

Q.

If a coil of metal wire is kept stationary in a non-uniform magnetic field, then

1. An e.m.f. is induced in the coil

2. A current is induced in the coil

3. Neither e.m.f. nor current is induced

4. Both e.m.f. and current is induced

Q. ntA certain quantity of electricity is passed through an aqueous solutions of AgNO3 and CuSO4 connected in series. IF the mass of Ag deposited is 1.08 g , the mass of Cu deposited will be ?n

Q.

How is the band gap formed?

Q. Calculate the charge of $6.24\times {10}^{18}$ electrons (in coulomb).

Q.

State two characteristics of a good thermion emitter.

Q. 45. How much silver will be obtained by the quantity of the current which displaces 5.6loyres of H2? 54g 108g 13.5g 20g

Q.

State Faradays Laws of Electromagnetic Induction.

Q. 26.Electrochemical equivalent of a substance is 0.0006735 its equivalent weight is (a) 65 (b) 67.35 (c) 130 (d) cannot be calculated.

Q.

how did we found out the mass of positive particles in canal rays experiment with discharge tube

Q.

$0.05F$ charge is passed through a lead storage battery. In the anodic reaction, what is the amount of ${\mathrm{PbSO}}_4$ precipitated (Molar mass of${\mathrm{PbSO}}_4$ is $303g/mol$) ?

1. $30.3g$

2. $15.5g$

3. $7.6g$

4. $60.6g$

Q.

What is a proton? State the charge on a proton in coulombs and mass in grams.

Q. How many faradays are required to reduce 1 mol of $C{r}_2{O}_7^{2-}$ to $C{r}^{3+}$ in acidic medium?

1. 6
2. 2
3. 3
4. 5

Q. Why we use noble gas atmosphere in zone refinig process?

Q. The charge required to convert three moles of $M{n}_3{O}_4$ to $Mn{O}_4^2{}^{-}$ in alkaline medium is ______.

1. 10F
2. 20F
3. 30F
4. 40F

Q. 28. During the electrolysis of molten NaCl, the time required to produce 0.10mole of chlorine gas using a current of 3 amperes is?

Q.

The minimum frequency ${\varsigma }_{min}$ of continuous $X$-rays is related to the applied pot. diff. $V$ as

1. $V_{min}\propto V$

2. $V_{min}\propto V^{1/2}$

3. $V_{min}\propto V^{-3}$

4. $V_{min}\propto V^4$

Q.

10800C ofelectricity through the electrolyte deposited 2. 977 gram of metal with atomic mass of 106.4 gram per mole find the charge on the metal cations

Q.

How many moles of water are required to be dissociated to produce oxygen which is just sufficient to form 800 g of magnesium oxide by burning magnesium? (atomic weight of Mg is 24)

Q.

How will you determine the charge and mass of an electron?

Q.

Explain how electrolysis is an example of a redox reaction.

Q.

An apparatus used for the measurement of quantity of electricity is known as a

[BHU 1979]

1. Calorimeter

2. Cathetometer

3. Coulometer

4. Colorimeter