- Which of the following element act as an inert electrode (PPSC 2017)?
a) Cu
b) Ag
c) Pt
d) None - If electricity is passed through a CuSO4 solution by using a Pt electrode then which of the following possible change occurs?
a) H2 is deposited at the cathode
b) Colour of the solution becomes fade
c) Cu is deposited at an anode
d) All are possible - The greater value of standard reduction potential greater will be the tendency?
a) To get oxidized
b) To get reduced
c) To accept electrons
d) Both B and C - What is the value of universal gas constant in Nernst equation when the potential is given in volts? (PPSC 2015)?
a) 8.314 J mol-1K-1
b) 0.0821 L atm mol-1K-1
c) 8.205 m3 atm mol-1K-1
d) 1.987 cal mol-1K-1 - Which of the following cell is not rechargeable? (PPSC 2020)?
a) Lead storage battery
b) Silver oxide cell
c) Fuel cell
d) Ni-Cd cell - Molten KCl conducts electricity due to the presence of?
a) Free ions
b) Free molecules
c) Free Electrons
d) Atoms of K and Cl - The degree of dissociation of week electrolyte increases as?
a) Pressure Increases
b) Dilution decreases
c) Dilution increases
d) None - What is the pH of HCl solution when the hydrogen gas electrode shows a potential of -0.22 V at standard temperature and pressure? (PPSC 2015)?
a) 2.17
b) 2.98
c) 3.73
d) 3.14 - Which of the following is true in the case of the Zn-Cu cell? (PPSC 2020)?
a) The flow of electrons takes place from copper to zinc
b) E0 red of the copper electrode is less than that of a zinc electrode
c) Zinc acts as an anode and copper as a cathode
d) All are correct - Faraday’s laws of electrolysis will fail when?
a) Temperature is increased
b) Inert electrodes are used
c) A mixture of electrolytes is used
d) In none of these cases - The equilibrium constant for a cell reaction, Cu(g) + 2Ag+(aq) → Cu2+(aq) + 2Ag (s) is 4 × 1016. Find E° (cell) for the cell reaction.?
a) 0.63 V
b) 0.49 V
c) 1.23 V
d) 3.24 V - For the measurement of standard electrode potential, Zn is dipped in (PPSC 2020)?
a) 1 M ZnO solution
b) 1 M ZnSO4 solution
c) 1.5 M ZnSO4 solution
d) 0.1 M ZnSO4 solution - Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in (PPSC 2017)?
a) Daniel cell
b) Downs cell
c) Voltaic cell
d) Nelsons cell - The electric charge for electrode decomposition of one gram equivalent of substance is?
a) One Ampere per second
b) 96500 Coulombs per second
c) One Ampere for one hour
d) Charge on one mole of electrons - The standard oxidation potential of Ni/Ni2+ electrode is 0.3 V. If this is combined with a hydrogen electrode in acid solution, at what pH of the solution with the measured e.m.f. be zero at 25°C? (Assume [Ni2+] = 1M)?
a) 5.08
b) 4
c) 4.5
d) 5.25
16- First Minister for Education was __?
a) Ghulam Muhammad
b) Zafar Ali Khan
c) Fazl ul Rehman
d) None of these
17- First CM of Punjab?
a) Francis Modie
b) Iftikhar Mamdot
c) Ayub Khorro
d) None of these
18- Current Chairman Senate is?
a) Asad Qaiser
b) Yousaf Raza Gillani
c) Sadiq Sanjrani
d) None of these
19- Current Education Minister in Punjab is?
a) Shafqat Mahmood
b) Rana Mashhood
c) Sikandar Hayat Rana
d) Mian Mahmood ul Rasheed
- PM Shabaz Shareef is _ in number?
a) 19th
b) 20th
c) 22nd
d) 24th
