Faraday's First Law

Q. The number of Faradays ($F$) required to produce $20g$ of calcium from molten $CaC{l}_2$ (Atomic mass of $Ca=40gmo{l}^{–1}$) is:

1. $3$
2. $2$
3. $1$
4. $4$

Q.

If NaCl is doped with 10^-4 mole of SrCl₂ the concentration of cationic vacancies will be

Q.

What weights of ${\mathrm{P}}_4{\mathrm{O}}_6$ and ${\mathrm{P}}_4{\mathrm{O}}_{10}$ will be produced by the combustion of $31\mathrm{g}$ of ${\mathrm{P}}_4$ in $32\mathrm{g}$ of oxygen leaving no ${\mathrm{P}}_4$ and no ${\mathrm{O}}_2$?

1. $55\mathrm{g}$ and $71\mathrm{g}$

2. $17.5\mathrm{g}$ and $19.5\mathrm{g}$

3. $2.75\mathrm{g}$ and $35.5\mathrm{g}$

4. $2.75\mathrm{g}$ and $29.5\mathrm{g}$

Q.

KClO3 on heating decomposes to give KCl and Oxygen. What is the volume of oxygen liberated at NTP by 0.1mol of KClO3?

Q.

What is the structure of Water in the VSEPR Theory?

Q. The reduction potential of hydrogen electrode having pH = 10 is

1. 0.59V
2. −0.59V
3. Zero Volt
4. – 0.059V

Q.

How much electricity is required in coulomb for the oxidation of ?

(i) 1 mole of $H_{2}Oto{O}_2$ ?

(ii) 1 mole of $FeOtoF{e}_2{O}_3$ ?

Q.

80% purity of 200 g caco3 decomposes to produce the CO2, FIND the volume of co2 gas at Stp(approximately)

Q. $A{l}_2{O}_3$ is reduced by electrolysis at low potentials and high currents. If $4.0\times {10}^{4}amperes$ ofcurrent is passed through molten $A{l}_2{O}_3$ for $6hours$, what mass of aluminium is produced? (Assume $100\%$ current efficiency, at. mass of $Al=27gmo{l}^{–1}$)

1. $8.1\times {10}^{4}g$
2. $2.4\times {10}^{5}g$
3. $1.3\times {10}^{4}g$
4. $9.0\times {10}^{3}g$

Q.

For the following reaction, the mass of water produced from $445\mathrm{g}$ of ${\mathrm{C}}_{57}{\mathrm{H}}_{110}{\mathrm{O}}_6$ is:

$\underset{\mathrm{Stearin}}{\underbrace{2{\mathrm{C}}_{57}{\mathrm{H}}_{110}{\mathrm{O}}_6\left(\mathrm{s}\right)}}+\underset{\mathrm{Oxygen}}{\underbrace{163{\mathrm{O}}_2\left(\mathrm{g}\right)}}\to \underset{\mathrm{Carbondioxide}}{\underbrace{114{\mathrm{CO}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{water}}{\underbrace{110{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}}$

Q.

How much charge is required for the following reductions :

(i) 1 mole of $A{l}^{3+}$ to Al ?

(ii) 1 mole of $C{u}^{2+}$ to Cu ?

(iii) 1 mole of $Mn{O}_4^{-}toM{n}^{2+}$ ?

Q.

A solution of Ni(NO₃)₂ is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?

Q.

What Is ${\mathrm{C}}_2{\mathrm{H}}_2$ Hybridization?

Q.

Which of the following is DDT?

1. Fertilizers

2. Greenhouse Gas

3. Biodegradable Pollutant

4. Non-biodegradable Pollutant

Q.

Describe the trend of metallic and non-metallic character of the elements of a period.

Q.

A solution of $Ni(N{O}_3{)}_2$ is electrolysed between platinum electrodes using a current of 5 amperes for 20 min. What mass of Ni is deposited at the cathode ? (Atomic mass of Ni = 58.7)

Q.

(i) How much electricity in terms of Faraday required to produce.

20.0 g of Ca from molten $CaC{l}_{2}P$

(ii) How much electricity in terms of Faraday required to produce.

Q. The pH of 0.5 L of a 1.0 M $NaCl$ solution after electrolysis for 965 seconds using 5.0 A current (100% efficiency) is:

Q. 1 mole electron are passed through CuSO_​​​4 , AgNO_​​​3 , and AlCl_​​​3, . What will be the mole ratio of Cu, Ag, Al collected at the electrodes?

Q. When electricity is passed through a solution of $AlC{l}_3$, 13.5 g of Al is deposited. The number of Faradays (charge) must be:

1. 0.5
2. 1
3. 1.5
4. 2

Q. 45. How long a current of 2A has to be passed through a solution of AgNO3 to coat a metal surface of 80cm2 with 5 micrometer thick layer

Q.

${\mathrm{Fex}}_2$and${\mathrm{Fey}}_3$ are known when $\mathrm{x}$ and $\mathrm{y}$ are:

1. $\mathrm{x}=\mathrm{Cl},\mathrm{Br},\mathrm{I}\mathrm{and}\mathrm{y}=\mathrm{F},\mathrm{Cl},\mathrm{Br},\mathrm{I}$

2. $\mathrm{x}=\mathrm{F},\mathrm{Cl},\mathrm{Br},\mathrm{I}\mathrm{and}\mathrm{y}=\mathrm{F},\mathrm{Cl},\mathrm{Br}$

3. $\mathrm{x}=\mathrm{F},\mathrm{Cl},\mathrm{Br},\mathrm{I}\mathrm{and}\mathrm{y}=\mathrm{F},\mathrm{Cl},\mathrm{Br},\mathrm{I}$

4. $\mathrm{x}=\mathrm{F},\mathrm{Cl},\mathrm{Br}\mathrm{and}\mathrm{y}=\mathrm{F},\mathrm{Cl},\mathrm{Br},\mathrm{I}$

Q. Which of the following expression(s) is/are correct at equilibrium condition of Daniell cell at ${25}^{\circ }C?$
For Daniel cell, $E_{cell}^0=1.1V$

1. $\frac{2.303RT}{F}log{K}_{eq}=0.55$
2. $\frac{2.303RT}{2F}log{K}_{eq}=1.1$
3. $log{K}_{eq}=\frac{2.2}{0.059}$
4. $log{K}_{eq}=\frac{0.55}{0.059}$

Q.

What is the molar ratio of ${\mathrm{H}}_2$ and ${\mathrm{O}}_2$ in the electrolysis of water?

Q. The pH of 1.0 L of 1.0 M NaCl after the electrolysis for 965 s using 5.0 A current (100% efficiency;log2 = 0.3), is

Q.

The charge used for the oxidation of one mole ${\mathrm{Mn}}_3{\mathrm{O}}_4$ into ${{\mathrm{MnO}}_4}^{2-}$ in presence of alkaline medium is

Q. On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer in stratosphere.

Q.

Deuterium is an isotope of hydrogen. Calculate the specific charge of deuteron (charge of electron $=1.6\times {10}^{-19}\mathrm{C}$; mass of proton $=1.67\times {10}^{-27}\mathrm{Kg}$; mass of neutron =$=1.72\times {10}^{-27}\mathrm{Kg}$.

1. $2.3\times {10}^7\mathrm{C}/\mathrm{kg}$

2. $1.15\times {10}^7\mathrm{C}/\mathrm{kg}$

3. $0.575\times {10}^8\mathrm{C}/\mathrm{kg}$

4. $3.45\times {10}^8\mathrm{C}/\mathrm{kg}$

Q. The Ostwald dilution law

1. is valid for weak electrolyte dissociation
2. is useful in calculating ionisation constant of acids or bases
3. fails completely when applied to strong electrolytes
4. none of the above

Q. Electrolysis of dilute aqueous $NaCl$ solution was carried out by passing $10mA$ current. The time required to liberate $0.01mole$ of $H_2$ gas at the cathode is ($1F=96500Cmo{l}^{-1})$:

1. $9.65\times {10}^{4}s$
2. $19.3\times {10}^{4}s$
3. $28.95\times {10}^{4}s$
4. $38.6\times {10}^{4}s$