Apparent charge on atom in molecule is
1.valency
2.coordination number
3.oxidation number
4.charge number
Capacity of one lead accumulator cell is
1.1.5 volts
2.2 volts
3.3 volts
4.1 volts
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
Chemical used in salt bridge is
1.KOH
2.KCI
3.KNO3
4.KBr
Decrease in oxidation number is called
1.oxidation
2.reduction
3.oxidation-reduction
4.all of above represent same entity
Density of H2SO4 in lead accumulator is
1.1.25g/cm3
2.1.3g/cm3
3.1.20g/cm3
4.1.15g/cm3
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
Electricity in voltaic cell is produced due to
1.neutralization
2.oxidation
3.reduction
4.both b & c
Electrode potential of Zn is
1.oxidation
2.reduction
3.oxidation-reduction
4.depends on the nature of the coupled electrode
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
Formula of Chile saltpetre is
1.NaNO3
2.CaCO3
3.Ba (NO3)2
4.NH4Cl
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
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
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
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
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
In alkaline battery the anode is made up of
1.MnO2
2.Zn
3.AgO2
4.cadmium
In an electrolytic cell cathode provides electrons to
1.ve ion
2.?ve ion
3.neutral atom
4.does not provide any electron
In electrolytic cell electricity carries
1.spontaneous reaction
2.non-wpontaneous reaction
3.neutralization
4.all of above
In electrolytic solution conductance of electricity is due to
1.free electrons
2.ions
3.metals
4.electrodes
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
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
In K2Cr2O7 the oxidation number of chromium is
1.7
2.6
3.-7
4.-6
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
Lead accumulators are
1.secondary cell
2.primary cell
3.voltaic cell
4.both a & c
Li is different from its family members due to
1.small size
2.high charge density
3.less electropositivity
4.all of the above
List of elements based on hydrogen scale is called
1.periodic table
2.groups
3.periods
4.electrochemical series
Molten NaCl conducts electricity due to the presence of
1.Free electrons
2.Free molecules
3.Free ions
4.Atoms of Na and Cl
Nitrates of which pair of elements give different products on thermal decomposition?
1.Na K
2.Mg Ca
3.Li Na
4.Li Ca
Percentage of sulphuric acid in lead accumulator is
1.40%
2.25%
3.30%
4.50%
Potential of SHE is considered as
1.zero
2.unity
3.constant
4.multiple of 1
Reaction at anode is called
1.oxidation
2.reduction
3.redox
4.decomposition
Right half cell contains __________ electrode
1.A1
2.Zn
3.Cu
4.Fe
Salt bridge transfers
1.electrons
2.anion
3.current
4.ions
Secondary cell is
1.rechargeable
2.non rechargeable
3.electrolytic cell
4.Daniel cell
Temperature for the measurement of standard electrode potential is
1.298K
2.300K
3.30?C
4.310K
The degree of dissociation of week electrolyte increases as
1.Pressure increases
2.Dilution decreases
3.Dilution increases
4.None
The element that act as anode always have _______ position in electrochemical cell
1.higher
2.lower
3.in middle
4.no effect of position
The elements which are very abundant in earth crust are
1.Si & A?
2.Ca & Mg
3.B & A?
4.All
The half cells are interconnected through
1.wire
2.salt bridge
3.electric circuit
4.no connection exists
The oxides of beryllium BeO is
1.Acidic
2.Basic
3.Amphoteric
4.Neutral
The reduction potential Zn is
1.0.76
2.-0.76
3.-0.55
4.0.55
The strength of solution of an element whose electrode potential is to be measured is
1.2M
2.1N
3.1m
4.1M
The word Alkali means
1.Base
2.Basic salt
3.Ashes
4.Spirit
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
Voltaic cell is a
1.irreversible cell
2.reversible cell
3.alkaline cell
4.all of the above
Which element is necessary for normal leaf development?
1.Si
2.Ba
3.Mg
4.Ca
Which of the following sulphates is not soluble in water?
1.Sodium sulphate
2.Potassium sulphate
3.Zinc sulphate
4.Barium sulphate
Which one of the following is not an alkali metal?
1.Francium
2.Caesium
3.Rubidium
4.Radium
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