R4RIN – MCQs, Mock Tests | Chemistry Chemistry MCQ 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

✅ Correct Answer: 1

The degree of dissociation of week electrolyte increases as

1. Pressure increases
2. Dilution decreases
3. Dilution increases
4. None

✅ Correct Answer: 3

Molten NaCl conducts electricity due to the presence of

1. Free electrons
2. Free molecules
3. Free ions
4. Atoms of Na and Cl

✅ Correct Answer: 3

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

✅ Correct Answer: 1

Electricity in voltaic cell is produced due to

1. neutralization
2. oxidation
3. reduction
4. both b & c

✅ Correct Answer: 4

In electrolytic solution conductance of electricity is due to

1. free electrons
2. ions
3. metals
4. electrodes

✅ Correct Answer: 2

In electrolytic cell electricity carries

1. spontaneous reaction
2. non-wpontaneous reaction
3. neutralization
4. all of above

✅ Correct Answer: 2

Reaction at anode is called

1. oxidation
2. reduction
3. redox
4. decomposition

✅ Correct Answer: 1

In an electrolytic cell cathode provides electrons to

1. ve ion
2. ?ve ion
3. neutral atom
4. does not provide any electron

✅ Correct Answer: 1

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

✅ Correct Answer: 1

Decrease in oxidation number is called

1. oxidation
2. reduction
3. oxidation-reduction
4. all of above represent same entity

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Right half cell contains __________ electrode

1. A1
2. Zn
3. Cu
4. Fe

✅ Correct Answer: 3

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

✅ Correct Answer: 3

Salt bridge transfers

1. electrons
2. anion
3. current
4. ions

✅ Correct Answer: 4

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

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Temperature for the measurement of standard electrode potential is

1. 298K
2. 300K
3. 30?C
4. 310K

✅ Correct Answer: 1

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

✅ Correct Answer: 1

Potential of SHE is considered as

1. zero
2. unity
3. constant
4. multiple of 1

✅ Correct Answer: 1

Chemical used in salt bridge is

1. KOH
2. KCI
3. KNO3
4. KBr

✅ Correct Answer: 2

Electrode potential of Zn is

1. oxidation
2. reduction
3. oxidation-reduction
4. depends on the nature of the coupled electrode

✅ Correct Answer: 4

List of elements based on hydrogen scale is called

1. periodic table
2. groups
3. periods
4. electrochemical series

✅ Correct Answer: 4

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

1. higher
2. lower
3. in middle
4. no effect of position

✅ Correct Answer: 1

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

✅ Correct Answer: 1

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

✅ Correct Answer: 4

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

✅ Correct Answer: 1

Secondary cell is

1. rechargeable
2. non rechargeable
3. electrolytic cell
4. Daniel cell

✅ Correct Answer: 1

Lead accumulators are

1. secondary cell
2. primary cell
3. voltaic cell
4. both a & c

✅ Correct Answer: 4

Density of H2SO4 in lead accumulator is

1. 1.25g/cm3
2. 1.3g/cm3
3. 1.20g/cm3
4. 1.15g/cm3

✅ Correct Answer: 1

Capacity of one lead accumulator cell is

1. 1.5 volts
2. 2 volts
3. 3 volts
4. 1 volts

✅ Correct Answer: 2

In alkaline battery the anode is made up of

1. MnO2
2. Zn
3. AgO2
4. cadmium

✅ Correct Answer: 2

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

1. 2M
2. 1N
3. 1m
4. 1M

✅ Correct Answer: 4

Apparent charge on atom in molecule is

1. valency
2. coordination number
3. oxidation number
4. charge number

✅ Correct Answer: 3

Voltaic cell is a

1. irreversible cell
2. reversible cell
3. alkaline cell
4. all of the above

✅ Correct Answer: 4

In K2Cr2O7 the oxidation number of chromium is

1. 7
2. 6
3. -7
4. -6

✅ Correct Answer: 2

Percentage of sulphuric acid in lead accumulator is

1. 40%
2. 25%
3. 30%
4. 50%

✅ Correct Answer: 3

The reduction potential Zn is

1. 0.76
2. -0.76
3. -0.55
4. 0.55

✅ Correct Answer: 2

The half cells are interconnected through

1. wire
2. salt bridge
3. electric circuit
4. no connection exists

✅ Correct Answer: 2

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

✅ Correct Answer: 3

The word Alkali means

1. Base
2. Basic salt
3. Ashes
4. Spirit

✅ Correct Answer: 3

Formula of Chile saltpetre is

1. NaNO3
2. CaCO3
3. Ba (NO3)2
4. NH4Cl

✅ Correct Answer: 1

The elements which are very abundant in earth crust are

1. Si & A?
2. Ca & Mg
3. B & A?
4. All

✅ Correct Answer: 1

The oxides of beryllium BeO is

1. Acidic
2. Basic
3. Amphoteric
4. Neutral

✅ Correct Answer: 3

Which element is necessary for normal leaf development?

1. Si
2. Ba
3. Mg
4. Ca

✅ Correct Answer: 4

Li is different from its family members due to

1. small size
2. high charge density
3. less electropositivity
4. all of the above

✅ Correct Answer: 4

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

✅ Correct Answer: 2

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

1. Na K
2. Mg Ca
3. Li Na
4. Li Ca

✅ Correct Answer: 3

Which one of the following is not an alkali metal?

1. Francium
2. Caesium
3. Rubidium
4. Radium

✅ Correct Answer: 4

Which of the following sulphates is not soluble in water?

1. Sodium sulphate
2. Potassium sulphate
3. Zinc sulphate
4. Barium sulphate

✅ Correct Answer: 4

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