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The electrolyte used in fuel cell is:
NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:
Highest oxidation state of chlorine Is
CH3Cl + Cl2 —-> CH2Cl2 + HCl is an example of ?
NTS 2015 SMBBMC
Chemistry
Electrochemistry
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Standard Electrode Potential is measured at temperature:
Zn can be deposited on iron by?
Only those substances are written in Ion Electron Method:
PMC Sample 1
Chemistry
Electrochemistry
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In Balancing redox equation, the first thing is to:
PMC Sample 3
Chemistry
Electrochemistry
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Oxidation number of Cr in K2Cr2O2 & K2Cr2O4 is:
Both a and c What is the oxidation number of S in SO2^(-2)?
The reaction: Cl2 + H2O→ HCl + HOCl is an example of:
NTS 2014
Chemistry
Electrochemistry
Elimination Tool:
The Oxidation state of Alkali metals in any compound is?
PMC Sample 3
Chemistry
Electrochemistry
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Stronger the oxidizing agent, greater is the:
NUMS 2020
Chemistry
Electrochemistry
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The oxidation number of nitrogen in the HNO3 is _______.
NUMS 2018
Chemistry
Electrochemistry
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In which of the following nitrogen compounds, does N has the highest oxidation state?
NTS 2018
Chemistry
Electrochemistry
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The overall positive reduction potential value predicts that process is:
NUMS 2015
Chemistry
Electrochemistry
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Which of the following exhibits an oxidation state of -3?
The oxidation number of all the elements in the free state is:
NTS 2012
Chemistry
Electrochemistry
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Which of the methods to prevent corrosion?
PMC Sample 3
Chemistry
Electrochemistry
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In electrochemical series, elements are arranged in order of their standard electrode potentials, the correct decreasing reactivity order for metals is:
NTS 2018
Chemistry
Electrochemistry
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The oxidation state of “S’ in the (S2O3)-2 is:
PMC 2020
Chemistry
Electrochemistry
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The oxidation potential standard hydrogen electrode is arbitrarily taken as:
NTS 2019
Chemistry
Electrochemistry
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If we move down the electrochemical series:
NUMS 2014
Chemistry
Electrochemistry
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The E.M.F of a Cell is equals to
PMC Sample 1
Chemistry
Electrochemistry
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Oxidation number of Nitrogen in HNO3, is:
NTS 2011
Chemistry
Electrochemistry
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Current in electrolysis is carried through:
PMC Sample 3
Chemistry
Electrochemistry
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In the following reaction:
3Br2 +6CO32- + 3H2O → 5Br-1 + BrO3-1 + 6HCO3-1
NTS 2014
Chemistry
Electrochemistry
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Which of the following is a balanced redox equation?
NUMS 2020
Chemistry
Electrochemistry
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What is the cell reaction of
Zn(s) | Zn2+(aq) 1M | Ni2+(aq) 1M | Ni(s)
Zn2+(aq) + 2e- -> Zn(s), Eo = -0.76 V
Ni2+(aq) + 2e- -> Ni(s), Eo = -0.25 V
NUMS 2019 Cancelled
Chemistry
Electrochemistry
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In Lead-Acid battery, product formed at anode during discharging is
Each half reaction in ion electron method is balanced by adding:
PMC Sample 1
Chemistry
Electrochemistry
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Oxidation is defined as:
Which of the following statements about the reaction given below are correct.
IO3-(aq) + 2I-(aq) + 6H+(aq) + 6Cl-(aq) -> 3ICl2-(aq) + 3H2O(l)
NUMS 2018
Chemistry
Electrochemistry
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The process of depositing a thin layer of expensive metals on ordinary or expensive metals is called:
NUMS 2017
Chemistry
Electrochemistry
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Decrease in Oxidation number is
PMC Sample 2
Chemistry
Electrochemistry
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which one of the following Is the oxidation number of Iodine in I2?
Which one among the following is the strongest reducing agent:
Fe2++ 2e -> Fe (-0.44V)
Sn2++ 2e -> Sn (-0.14 V)
Ni2++ 2e -> Ni (0.25 V)
Fe3++ e -> Fe2+(-0.77 V)
NUMS 2018
Chemistry
Electrochemistry
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The oxidation state of carbon in C2O42- is:
NUMS 2019 Reconduct
Chemistry
Electrochemistry
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What is the oxidation state of Mn in K2MnO4?
In the reaction 2Fe+Cl2 2FeCl3
NTS 2017
Chemistry
Electrochemistry
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The hydrogen gas bubbling into one molar solution of HCl has a pressure of
PMC Sample 3
Chemistry
Electrochemistry
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Two half cells of a galvanic cell are connected with a salt bridge, the electrons flow from:
The process in which electric current is used to carry out a non-spontaneous redox reaction is called:
NTS 2017
Chemistry
Electrochemistry
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Which of the following metals does NOT liberate hydrogen in reaction with acids?
NUMS 2019 Reconduct
Chemistry
Electrochemistry
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A solution of Sodium Sulphate was electrolyzed using platinum electrode, the products at the anode and cathode respectively are:
NUMS 2017
Chemistry
Electrochemistry
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Hydrolysis means reaction with
PMC Sample 3
Chemistry
Electrochemistry
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The common oxidation number of halogens is:
PMC 2020
Chemistry
Electrochemistry
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The oxidation number of Br in Br2 is:
NTS 2019
Chemistry
Electrochemistry
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Oxidation state of P in Mg2P3O5 Is
X is a salt that decomposes in water.
What is the reason for its decomposition?
e-+ X3+→ X2+ Ecell= 1.91 V
NUMS 2018
Chemistry
Electrochemistry
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Current in electrolysis is carried through?
PMC Practice 1
Chemistry
Electrochemistry
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Standard reduction potential of F2, Br2 is:
Conversion of Electrical energy into chemical energy is
PMC Sample 1
Chemistry
Electrochemistry
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Oxidation state of sulphur in H2SO4?
If we balanced the following reaction , what is the net ionic charge on the right side of the equation?
__H+ +___ MnO4- + ____ Fe2+ →___ Mn2+ + ___ Fe3+ + ___ H2O
NTS 2014
Chemistry
Electrochemistry
Elimination Tool:
Definition of electrode potential is?
Conversion of Electrical energy into chemical energy is
PMC Sample 2
Chemistry
Electrochemistry
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When electricity is passed through water in the presence of an acid, oxygen and ______ is produced.
NTS 2018
Chemistry
Electrochemistry
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Oxidation number of particular element can be directly or indirectly inferred from its:
UHS 2019
Chemistry
Electrochemistry
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The breakdown of a substance with current is:
NUMS 2020
Chemistry
Electrochemistry
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Which one has valency other than one?
On balancing the following chemical equation: K2CrO4, + HCI –> KCI + 2CrCI3 + Cl2 + H2O The co-efficient with HCI will be?
+3 and +5 oxidation states are often shown by:
During oxidation process, oxidation number of an element:
PMC 2020
Chemistry
Electrochemistry
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Stronger the oxidizing agent, higher is the:
NUMS 2019 Reconduct
Chemistry
Electrochemistry
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In the electrolysis of molten ZnCl2, how much Zn can be deposited at the cathode by the passage of 0.01 ampere for one hour?
NUMS 2017
Chemistry
Electrochemistry
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The process in which electric current is used to carry out a non-spontaneous redox reaction is called:
NUMS 2018
Chemistry
Electrochemistry
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