Olete.in – MCQs, Mock Tests & Government Job Prep | CBES Board Class 9 Electrochemistry Multiple Choice Questions Class 9

The process in which substance gains electrons is called

1. oxidation
2. hydrogenation
3. sublimation
4. reduction

✅ Correct Answer: 4

On an industrial scale sodium metal is prepared by electrolysis of fused

1. NaOH
2. NaCl
3. NaO
4. NH3

✅ Correct Answer: 2

Corrosion can be prevented by

1. Alloying
2. Tinning
3. Galvanizing
4. all of above

✅ Correct Answer: 4

The electrolyte used for tin plating is

1. sulphide ore
2. stannous sulphate
3. hydrogen sulphate
4. sodium chloride

✅ Correct Answer: 2

An electrolytic cell uses electrical energy to drive

1. chemical reaction
2. physical reaction
3. no reaction
4. biochemical reaction

✅ Correct Answer: 1

Loss of hydrogen atoms by an element is called

1. hydrogenation
2. oxidation
3. reduction
4. sublimation

✅ Correct Answer: 2

The elements whose oxidation number is increased are

1. reduced
2. hydrogenated
3. oxidized
4. oxygenated

✅ Correct Answer: 3

The oxidation state of group IIIA metals is

1. -3
2. 3
3. 0
4. 1

✅ Correct Answer: 2

In a dry cell the anode is made up of

1. zinc
2. calcium
3. sodium
4. graphite

✅ Correct Answer: 4

An electrochemical cell is also called

1. battery cell
2. galvanic cell
3. cell
4. chargeable cell

✅ Correct Answer: 2

As compare to iron aluminum has

1. higher tendency to oxidize
2. less tendency to oxidize
3. equal tendency to oxidize
4. all of above

✅ Correct Answer: 1

Oxidation-reduction reaction involves

1. transfer of neutrons
2. transfer of protons
3. transfer of electrons
4. all of above

✅ Correct Answer: 3

Lead and Zinc metals occur naturally as

1. oxides
2. sulphite ores
3. carbon ores
4. chloride ores

✅ Correct Answer: 2

Conditions for good electroplating are

1. high current density
2. low temperature
3. high concentration of metal in electrolyte
4. all of above

✅ Correct Answer: 4

Electrochemical cells convert which of these into electrical energy?

1. mechanical energy
2. potential energy
3. kinetic energy
4. chemical energy

✅ Correct Answer: 4

The electrolyte among the following is

1. NaOH
2. urea
3. glucose
4. benzene

✅ Correct Answer: 1

The process used to deposit one metal over another metal is called

1. electrolysis
2. electroplating
3. carbon plating
4. none of above

✅ Correct Answer: 2

A physical or chemical process that occurs by itself is called

1. non spontaneous
2. self occurring process
3. spontaneous process
4. thermodynamic process

✅ Correct Answer: 3

Voltaic cells generate electricity by

1. spontaneous redox reaction
2. non spontaneous redox reaction
3. sublimation reaction
4. thermochemical reaction

✅ Correct Answer: 1

The oxidation state of any free element is always

1. 1
2. 2
3. 3
4. 0

✅ Correct Answer: 4

Galvanic cells are also named as

1. electrolytic cells
2. battery cells
3. Daniel cells
4. John cells

✅ Correct Answer: 3

When zinc is plated on steel the anode is made up of

1. steel
2. oxygen
3. zinc
4. carbon

✅ Correct Answer: 3

Electrolysis of brine produces

1. chlorine gas
2. hydrogen gas
3. sodium hydroxide
4. all of above

✅ Correct Answer: 4

A reactant containing the element that is oxidized is called

1. reducing agent
2. oxidizing agent
3. hydrogen
4. sublime

✅ Correct Answer: 1

By losing one or two electrons the atoms of metal are

1. oxidized
2. reduced
3. hydrogenated
4. sublimated

✅ Correct Answer: 1

In chromium plating few drops of Sulphuric acid are added to the electrolyte to prevent

1. oxidation
2. reduction
3. hydrolysis
4. sublimation

✅ Correct Answer: 3

The electrodes used in the production of sodium metal are

1. iron cathode and graphite anode
2. sodium cathode and carbon anode
3. aluminum cathode and fluoride anode
4. aluminum cathode and sodium anode

✅ Correct Answer: 1

In thermal power stations carbon atoms undergo oxidation to form

1. CO2
2. CO
3. H2O
4. O2

✅ Correct Answer: 1

Electrolytes convert electricity in

1. solid state
2. liquid state
3. gaseous state
4. plasma state

✅ Correct Answer: 2

A concentrated aqueous solution of sodium chloride is called

1. aqueous solution
2. salt solution
3. brine
4. lemonade

✅ Correct Answer: 3

Rusting of iron occurs due to

1. reduction
2. hydrogenation
3. oxidation
4. sublimation

✅ Correct Answer: 3

The element reduced in following reaction 2Ca + O2 2CaO is

1. Ca
2. O2
3. CaO
4. none of above

✅ Correct Answer: 2