NEET Chemistry Chapter Wise Mock Test – Electrochemistry

NEET Chemistry Chapter Wise Mock Test – Electrochemistry

Question 1:
Which of the following statements about solutions of electrolytes is not correct?
(a) Conductivity of solution depends upon size of ions
(b) Conductivity depends upon viscosity of solution
(c) Conductivity does not depend upon solvation of ions present in solution .
(d) Conductivity of solution increases with temperature

Question 2:
Which of the following electrolytic solutions has the least specific conductance?
(a) 0.02 N
(b) 0.2 N
(c) 2 N
(d) 0.002 N

Question 3:

Question 4:

Question 5:
What amount of Cl₂ gas is liberated at anode, if 1A current is passed for 30 min in NaCI solution?
(a) 0.66 mole
(b)0.33 mole
(c)0.66g
(d) 0.33 g

Question 6:

Question 7:
9.65 C of electric current is passed through fused anhydrous MgCI₂. The magnesium . metal thus obtained is completely converted into a Grignard reagent. The number of moles of Grignard reagent obtained is
(a) 5 x 10-4
(b) 1×10-4
(c) 5 x 10-5
(d) 1 x 1-5

Question 8:
What is the current efficiency of an electrode deposition of Cu metal from CuS04 solution in which 9.80 g copper is deposited by the passage of 5A current for 2 h?
(a) 41.4%
(b) 50%
(c) 75%
(d) 82.8%

Question 9:
A current of 12 A is passed through an electrolytic cell containing aqueous NiS04 solution. Both Ni and H2 gas are formed at the cathode. The current efficiency is 60%. What is the mass of nickel deposited on the cathode per hour?
(a) 7.883 g
(b) 3.941 g
(c) 5.91 g
(d) 2.645 g

Question 10:

Question 11:
Time required to deposit one millimole of aluminium metal by the . passage ^^65 A through molten electrolyte containing aluminium ion is
(a) 30 s
(b) 10 s
(c) 30000 s
(d) 10000 s

Question 12:
A solution of Ni(N03)2 is electrolysed between platinum electrodes using a current of 5 A for 20 min. What mass of Ni is deposited at the cathode?
(Atomic mass of Ni = 58.7)
(a) 5.87 g
(b)1.82g
(c) 3.97 g
(d)2.22g

Question 13:
In electrolysis of dil. HgSO^ what is liberated at anode?
(a) H₂
(b) SO₂
(c) S0₂
(d) 0₂

Question 14:
What is the cell reaction occurring in Daniell cell (Galvanic cell)?
(a) Cu(s) + ZnS04(aqf) > CuS04(aq) + Zn(s)
(b) Zn(s) + CuS04 (aq) >Cu(s) + ZnS04 (aq)
(c) Ni(s) + ZnS04 (aq) >NiS04 (aq) + Zn(s)
(d) 2Na(s) + CdS04 (aq) >Na2S04 (aq) + Cd(s)

Question 15:
Arrange the following metals in the order in which they ‘ displace each other from the solution of their salts. Al, Cu, Fe, Mg and Zn.
(a) Mg > Zn > Al > Fe > Cu
(b) Mg > Fe > Al > Zn > Cu
(c) Mg > Al > Zn > Fe > Cu
(d) Mg > Al > Fe > Zn > Cu

Question 16:

Question 17:

Question 18:
The reduction potential of hydrogen half-cell will negative if
(a) p(H₂) = 1 atm and [H+] = 2.0 M
(b) p(H₂) = 1 atm and [H+] = 1.0 M
(c) p(H₂) = 2 atm and [H+] = 1.0 M
(d) p(H₂) = 2 atm and [H+] = 2.0 M

Question 19:

Question 20:
E1, E2 and E3 are the emfs of the following three galvanic cells respectively
(i) Zn(s)|Zn2+(0.1 M)||Cu2+(1 M)|Cu(s)
(ilj Zn(s)|Zn2+(1 M)||Cu2+(1M)|Cu(s)
(ii) Zn(s)|Zn2+(1 M)||Cu2+(0.1 M)|Cu(s)
Which one of the following is true?
(a) E2 >E1 >E3
(b) E1>E2>E3
(c) E3 >E1 >E2
(d) E3 >E2 >E1

Question 21:

Question 22:

Question 23:

Question 24:

Question 25:

Question 26:
The solution of CuS04 in which copper rod is immersed is diluted to 10 times, the reduction electrode potential
(a) increases by 0.030 V
(b) decreases by 0.030 V
(c) increases by 0.059 V
(d) decreases by 0.059 V

Question 27:

Question 28:

Question 29:

Question 30:

Question 31:

Question 32:

Question 33:
The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be
(a)2.0x 10¹¹
(b) 4.0 x 10¹²
(c) 1.0 x 10²
(d) 1.0 x10¹°

Question 34:
While charging the lead storage battery,
(a) PbS0₄ anode is reduced to Pb
(b) PbS0₄ cathode is reduced to Pb
(c) PbS0₄ cathode is oxidised to Pb
(d) PbS0₄ anode is oxidised to Pb0₂

Question 35:
When lead storage battery is charged
(a) lead dioxide dissolves
(b) sulphuric acid is regenerated
(c) the lead electrode becomes coated with lead sulphate
(d) the amount of sulphuric acid decreases

Question 36:
In a H₂-0₂ fuel cell, combustion of hydrogen occurs to
(a) remove absorbed oxygen from electrode surface
(b) create potential difference between the two electrodes
(c) produce high purity water
(d) generate heat s

Question 37:

Direction (Q. Nos. 38-39) In the following questions, more than one of the answers given may be correct. Select the correct answers and mark it according to the codes.
Codes
(a) 1, 2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 38:

Question 39:

Question 40:

Question 41:

Direction (Q. Nos. 42-44) Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 42:
Assertion In a Daniell cell, if concentrations of Cu²⁺ and Zn²⁺ ions are doubled, the emf of the cell will be doubled.
Reason If the concentration of ions in contact with the metal is doubled, the electrode potential will be doubled.

Question 43:
Assertion Lead storage battery is a secondary cell.
Reason Lead storage battery is used in automobiles and invertors.

Question 44:
Assertion As a lead storage battery gets discharged, density of electrolyte present in it decreases.
Reason Lead and lead dioxide both react with sulphuric acid to form lead sulphate

Question 45:
A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as
(a) fuel cell
(b) electrolytic cell
(c) dynamo
(d) Ni-Cd cell

Question 46:
The quantity of electricity required to oxidise 0.1 moleof MnO₄^2- completely to Mn0^–₄, is
(a) 96500 C
(b) 2x96500C
(c)9650 C
(d) 196.50 C

Question 47:
The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of 02 at STP will be
(a) 5.4 g
(b)10.8g
(c)54.0g
(d) 108.0g

Question 48:
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCI of pH =10 and by hydrogen gas around the platinum wire at one atm. Pressure the oxidation potential of electrode would be
(a) 0.59 V
(b) 0.118 V
(c) 1.18 V
(d) 0.059 V

Question 49:

Question 50:

Question 51:

Question 52:

Question 53:

Question 54:
Standard electrode potential for Sn⁴⁺| Sn²⁺ couple is + 0.15 V and that for the Cr³⁺| Cr couple is -0.74 . These two couples in their standard state are connected to make a cell. The cell potential will be
(a) + 0.89 V
(b)+0.18 V
(c)+1.83 V
(d)+1.199 V

Question 55:
If the E°_cell for a given reaction has a negative value then which of the following gives the correct relationships for the values of AG° and K_eq?
(a)AG°<0;K_eq >1
(b) AG°< 0; K_eq <1
(c) AG°>0; K_eq > 1
(d) AG° >0; K_eq <1

Question 56:
Standard electrode potential of three metals X, Y and Z are -1.2 V, +0.5 V and -3.0 V respectively. The reducing power of these metals will be
(a)Y>X>Z
(b)Z>X>Y
(c)X>Y>Z
(d)Y >Z >X

Question 57:
What is the time (in s) required for depositing all the silver present in 125 ml_ of 1 M AgN03 solution by passing a current of 241.25 A? (1F = 96500 C)
(a) 10
(b) 50
(c) 1000
(d) 100

Question 58:
Which of the following is widely used in the manufacture of lead storage battery?
(a) Arsenic
(b) Lithium
(c) Bismuth
(d) Antimony

Question 59:‘

Question 60:
For the reduction of silver ions with copper metal, thestandard cell potential was found to be +0.46 V at 25°C. The value of standard Gibbs energy, AG° will be (F = 96500 C mol^-1)
(a) -89.0 kJ
(b) -89.0J
(c)-44.5kJ
(d)-98.0kJ

Question 61:
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
(a) increase in ionic mobility of ions
(b) 100% ionisation of electrolyte at normal dilution
(c) increase in both, i.e. number of ions and ionic mobility of ions
(d) increase in number of ions

Answers:

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