MCQ ELECTRO CHEMISTRY CHAPTER -3 CLASS 12

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NAME OF STUDENT

CLASS

A 12

B OTHER

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SECTION

1 A

2 B

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NAME OF SCHOOL

A JNV

B OTHER

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1. A new galvanic cell of E^u more than E°dl of Daniel cell is connected to Daniel cell in a manner that new cell gives electrons to cathode, what will happen

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(a) Ecell will increase

(b) Ecell will decrease

(d) Daniel cell will work as electrolytic cell where Zn will be deposite on zinc rod and copper will dissolve from copper rod.

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2. Ag+(aq) + e– → Ag(s) E° = + 0.80 VFe2+(aq)+ + 2e– → Fe(s) E° = – 0.44 VWhat is emf ofFe(s) + 2Ag+(aq) → Fe2+(aq) + 2Ag(s)

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(a) 1.16 V

(b) 1.24 V

(d) -1.16 V

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3. A conductivity cell containing electrodes made up of

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(a) Gold

(b) Silver

(d) Copper

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4 . What is pH of the half cell Pt|H2fe)|H+ if E∘H+H2 =-0.0295 V

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(a) 1

(b)2

(d) 3

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5 Which of the following statement is correct?

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(a) ECell and ∆rG of cell reaction both are extensive properties.

(b) ECell and ∆rG of cell reaction both are . intensive properties.

(d) ECell is an extensive property while ∆rG of cell reaction is an intensive property.

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6While charging the lead storage battery ________

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(a) PbSO4 anode is reduced to Pb.

(b) PbSO4 cathode is reduced to Pb.

(d) PbSO4 anode is oxidised to PbO2.

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7 Λ of M/32 solution of weak acid is 8 S cm2 mol-1 and limiting molar conductivity is 400 S cm2 mol1. Ka for acid is

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(a) 1.25 × 10-6

(b) 6.25× 10-4

(d) 1.25 × 10-5

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8 The positive value of the standard electrode potential of Cu2+/Cu indicates that _____

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(a) this redox couple is a stronger reducing agent than the H+/H2 couple.

(b) this redox couple is a stronger oxidising agent than H+/H2.

(id) Cu cannot displace H2 from acid.

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9The charge required for the reduction of 1 mol of MnO4– to MnO2 is

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(a) 1 F

(b) 3 F

(d) 6 F

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10 If limiting molar conductivity of Ca2+ and Cl– are 119.0 and 76.3 S cm2 mol-1, then the value of limiting molar conductivity of CaCl2 will be

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(a) 195.3 S cm2 mol-1

(b) 271.6 S cm2 mol-1

(d) 314.3 S cm2 mol-1.

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