Chemistry/Chemistry MCQ Question - Electrochemistry Sample Test,Sample questions

Question:
Apparent charge on atom in molecule is

1.valency

2.coordination number

3.oxidation number

4.charge number


Question:
Capacity of one lead accumulator cell is

1.1.5 volts

2.2 volts

3.3 volts

4.1 volts


Question:
Carbonates of lithium are not stable like that of sodium due to

1.Low electronegativity

2.Low electropositivity

3.Low charge density

4.Not known yet


Question:
Chemical used in salt bridge is

1.KOH

2.KCI

3.KNO3

4.KBr


Question:
Decrease in oxidation number is called

1.oxidation

2.reduction

3.oxidation-reduction

4.all of above represent same entity


Question:
Density of H2SO4 in lead accumulator is

1.1.25g/cm3

2.1.3g/cm3

3.1.20g/cm3

4.1.15g/cm3


Question:
E0red of an element cab be calculated by comparing it with

1.New electrode of same element

2.SHE

3.1M solution of ions of respective element

4.2M solution of HCI


Question:
Electricity in voltaic cell is produced due to

1.neutralization

2.oxidation

3.reduction

4.both b & c


Question:
Electrode potential of Zn is

1.oxidation

2.reduction

3.oxidation-reduction

4.depends on the nature of the coupled electrode


Question:
For the measurement of standard electrode potential Zn is dipped in

1.1 M ZnO solution

2.1 M ZnSO4 solution

3.1.5 M ZnSO4 solution

4.0.1 M ZnSO4 solution


Question:
Formula of Chile saltpetre is

1.NaNO3

2.CaCO3

3.Ba (NO3)2

4.NH4Cl


Question:
Greater value of standard reduction potential greater will be tendency

1.to get oxidized

2.to get reduced

3.to accept electrons

4.both b and c


Question:
Greater value of standard reduction potential smaller will be tendency

1.to form positive ions

2.to form negative ions

3.gain electrons

4.all are possible


Question:
H2 gas in SHE is filled at pressure of

1.760mm of Hg

2.750mm of Hg

3.780mm of Hg

4.800mm of Hg


Question:
I ? A elements are named as alkali metals because

1.Their oxides are basic

2.Their oxide and hydroxides are water soluble

3.Both a & b

4.They are found in earth


Question:
In a galvanic cell

1.Chemical energy is converted into electricity

2.Chemical energy is converted into heat

3.Electrical energy is converted into chemical energy

4.Electrical energy is converted into heat


Question:
In alkaline battery the anode is made up of

1.MnO2

2.Zn

3.AgO2

4.cadmium


Question:
In an electrolytic cell cathode provides electrons to

1.ve ion

2.?ve ion

3.neutral atom

4.does not provide any electron


Question:
In electrolytic cell electricity carries

1.spontaneous reaction

2.non-wpontaneous reaction

3.neutralization

4.all of above


Question:
In electrolytic solution conductance of electricity is due to

1.free electrons

2.ions

3.metals

4.electrodes


Question:
In Galvanic cell electrons flow from anode to cathode through

1.external electric circuit

2.salt bridge

3.movement of ions

4.all of the above


Question:
In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be

1.greater

2.lesser

3.sum of reduction and oxidation potentials

4.none


Question:
In K2Cr2O7 the oxidation number of chromium is

1.7

2.6

3.-7

4.-6


Question:
In which of the following reactions occur at cathode?

1.Cu2++2e-? Cu

2.Cu+2e-? Cu2+

3.Hg + O2 ? HgO

4.Mg + O2 ? MgO


Question:
Lead accumulators are

1.secondary cell

2.primary cell

3.voltaic cell

4.both a & c


Question:
Li is different from its family members due to

1.small size

2.high charge density

3.less electropositivity

4.all of the above


Question:
List of elements based on hydrogen scale is called

1.periodic table

2.groups

3.periods

4.electrochemical series


Question:
Molten NaCl conducts electricity due to the presence of

1.Free electrons

2.Free molecules

3.Free ions

4.Atoms of Na and Cl


Question:
Nitrates of which pair of elements give different products on thermal decomposition?

1.Na K

2.Mg Ca

3.Li Na

4.Li Ca


Question:
Percentage of sulphuric acid in lead accumulator is

1.40%

2.25%

3.30%

4.50%


Question:
Potential of SHE is considered as

1.zero

2.unity

3.constant

4.multiple of 1


Question:
Reaction at anode is called

1.oxidation

2.reduction

3.redox

4.decomposition


Question:
Right half cell contains __________ electrode

1.A1

2.Zn

3.Cu

4.Fe


Question:
Salt bridge transfers

1.electrons

2.anion

3.current

4.ions


Question:
Secondary cell is

1.rechargeable

2.non rechargeable

3.electrolytic cell

4.Daniel cell


Question:
Temperature for the measurement of standard electrode potential is

1.298K

2.300K

3.30?C

4.310K


Question:
The degree of dissociation of week electrolyte increases as

1.Pressure increases

2.Dilution decreases

3.Dilution increases

4.None


Question:
The element that act as anode always have _______ position in electrochemical cell

1.higher

2.lower

3.in middle

4.no effect of position


Question:
The elements which are very abundant in earth crust are

1.Si & A?

2.Ca & Mg

3.B & A?

4.All


Question:
The half cells are interconnected through

1.wire

2.salt bridge

3.electric circuit

4.no connection exists


Question:
The oxides of beryllium BeO is

1.Acidic

2.Basic

3.Amphoteric

4.Neutral


Question:
The reduction potential Zn is

1.0.76

2.-0.76

3.-0.55

4.0.55


Question:
The strength of solution of an element whose electrode potential is to be measured is

1.2M

2.1N

3.1m

4.1M


Question:
The word Alkali means

1.Base

2.Basic salt

3.Ashes

4.Spirit


Question:
Voltaic cell can be recharged by

1.by addition of fresh solution

2.by replacing external circuit with external source of electricity

3.by removal of solution

4.by heating it


Question:
Voltaic cell is a

1.irreversible cell

2.reversible cell

3.alkaline cell

4.all of the above


Question:
Which element is necessary for normal leaf development?

1.Si

2.Ba

3.Mg

4.Ca


Question:
Which of the following sulphates is not soluble in water?

1.Sodium sulphate

2.Potassium sulphate

3.Zinc sulphate

4.Barium sulphate


Question:
Which one of the following is not an alkali metal?

1.Francium

2.Caesium

3.Rubidium

4.Radium


Question:
Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in

1.Daniel cell

2.Downs cell

3.Voltaic cell

4.Nelsons cell


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