42 + Mcqs in Redox reaction Page 1 McqOptions

1.	In Copper(II) Oxide (CuO) and Carbon Monoxide (CO) reaction,
A.	CuO is being oxidized
B.	CuO is being reduced
C.	CO is being reduced
D.	CO is being oxidized
Answer» C. CO is being reduced

Discussion

2.	If Potassium Iodide (KI) acts as oxidizing agent, change occurs from, indicates presence of
A.	colorless to brown
B.	colorless to blue
C.	brown to colorless
D.	blue to colorless
Answer» B. colorless to blue

Discussion

3.	At high temperatures, enzymes...
A.	act very rapidly
B.	get denatured
C.	form cations
D.	form anions
Answer» C. form cations

Discussion

4.	Reducing agents does not include
A.	chlorine
B.	chlorine
C.	potassium iodide
D.	carbon monoxide
Answer» B. chlorine

Discussion

5.	When dichromate (VI) ion becomes reduced to chromium (III) ion, a change of color occurs from
A.	purple to pink
B.	purple to colorless
C.	purple to colorless
D.	orange to green
Answer» E.

Discussion

6.	Exothermic reactions are
A.	making of chemical bond
B.	more common reactions
C.	burning of carbon
D.	all of these
Answer» E.

Discussion

7.	Change of orange color of Chromium(VI) (Cr+6) to green color of Chromium(III) (Cr+3) indicates presence of a
A.	reducing agent
B.	oxidizing agent
C.	reagent
D.	drying agent
Answer» B. oxidizing agent

Discussion

8.	Displacement reaction occurs when
A.	a more reactive non-metal displaces less reactive non-metals
B.	a more reactive metal displaces a less reactive metal
C.	metal lower in reactivity series is added
D.	Both A and B
Answer» E.

Discussion

9.	A reductant
A.	removes oxygen
B.	donates electrons
C.	Both A and B
D.	is the oxidising agent
Answer» D. is the oxidising agent

Discussion

10.	In electrolysis of copper purification, at cathode
A.	pure copper gets deposited
B.	the object to be electroplated is kept
C.	impure copper gets deposited
D.	CuSO4 gets deposited
Answer» B. the object to be electroplated is kept

Discussion

11.	After accepting electrons, Manganate Mn(VII) ion becomes oxidized to
A.	Mn (VI) ions
B.	OpMn (V)tion
C.	Mn(III) ions
D.	Mn(II) ions
Answer» E.

Discussion

12.	Reaction of Lead Oxide (PbO) and Hydrogen Gas (H2) leads to
A.	reduction of Lead
B.	reduction of Lead
C.	formation of PbCl2
D.	formation of PbO
Answer» C. formation of PbCl2

Discussion

13.	While passing hydrogen over heated CuO(s), black color is oxidized to
A.	golden color
B.	pink color
C.	blue color
D.	colorless
Answer» C. blue color

Discussion

14.	In a Redox reaction,
A.	oxidation occurs
B.	reduction occurs
C.	neutralization occurs
D.	Both A and B
Answer» E.

Discussion

15.	Non-metals are good at
A.	accepting electrons
B.	sharing electrons
C.	donating electrons
D.	Both A and B
Answer» E.

Discussion

16.	In plentiful supply of oxygen or air, burning of carbon gives off
A.	carbon monoxide
B.	carbon dioxide
C.	H3O
D.	H2CO3
Answer» C. H3O

Discussion

17.	Oxidation is also referred to as
A.	combustion
B.	respiration
C.	transpiration
D.	Both A and B
Answer» E.

Discussion

18.	While Iodide ion (I-) oxidizes to Iodine (I2), a change in color from colorless to
A.	brown occurs
B.	pink occurs
C.	pink occurs
D.	violet occurs
Answer» B. pink occurs

Discussion

19.	In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction
A.	CO is being oxidized
B.	CuO is being oxidized
C.	CO is being reduced
D.	CuO is being reduced
Answer» B. CuO is being oxidized

Discussion

20.	Upon adding sugar in hot drink, slow dissolution is of
A.	sugar cubes dissolve slowly
B.	granulated sugar cubes dissolve slowly
C.	brown sugar doesn?t dissolve easily
D.	all of the above
Answer» B. granulated sugar cubes dissolve slowly

Discussion

21.	While Potassium Iodide (KI) is a powerful reducing agent,
A.	the iodide ion is oxidized to iodine
B.	the iodide ion is reduced to iodine
C.	iodine is reduced to iodide ion
D.	iodine is oxidized to iodide ion
Answer» B. the iodide ion is reduced to iodine

Discussion

22.	Activation energy can be lowered through use of
A.	catalysts
B.	inhibitors
C.	enzymes
D.	insulators
Answer» B. inhibitors

Discussion

23.	Oxidizing agents does not include
A.	potassium iodide
B.	potassium manganate
C.	potassium dichromate
D.	bromine solutions
Answer» B. potassium manganate

Discussion

24.	Reduction involves
A.	loss of oxygen
B.	gain in hydrogen
C.	gain in oxygen
D.	loss of electrons
Answer» B. gain in hydrogen

Discussion

25.	Hydrogen acts as a reducing agent,
A.	by taking oxygen
B.	by giving electrons
C.	by taking hydrogen
D.	Both A and B
Answer» E.

Discussion

26.	In a reaction between CuSO4(s) and Zn(s),
A.	copper gains electrons
B.	copper is being reduced
C.	copper experiences a decrease in oxidation state
D.	all of these
Answer» E.

Discussion

27.	Upon oxidation of acidified potassium manganate (VII), purple color of Manganese
A.	stays
B.	changes to pink
C.	becomes colorless
D.	becomes blue
Answer» D. becomes blue

Discussion

28.	In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction, reducing agent is
A.	CuO
B.	CO
C.	Cu
D.	CO2
Answer» C. Cu

Discussion

29.	Oxidizing agents
A.	are mostly non-metals
B.	are mostly metals
C.	decrease in oxidation state
D.	are mostly transition metals
Answer» B. are mostly metals

Discussion

30.	Old paintings became discolourised due to
A.	Lead Sulphide PbS
B.	Lead Sulphate PbSO4
C.	Lead Chloride PbCl2
D.	Lead Chloride PbCl2
Answer» B. Lead Sulphate PbSO4

Discussion

31.	In a reaction between CuSO4(s) and Zn(s),
A.	Zinc experiences an increase in the oxidation state
B.	undergoes oxidation
C.	Zinc undergoes oxidation
D.	all of these
Answer» E.

Discussion

32.	Oxidation involves
A.	Oxidation involves
B.	loss of oxygen
C.	gain in hydrogen
D.	gain in electrons
Answer» B. loss of oxygen

Discussion

33.	In an acidified solution of Potassium Dichromate(VI) (K2Cr2O7), Dichromate ion (Cr2O7-2) becomes reduced to
A.	Chromate (V) ions
B.	Chromium (III) ions
C.	Chromium (II) ions
D.	Chromium (VI) ions
Answer» C. Chromium (II) ions

Discussion

34.	If acidified Potassium Dichromate(VI) (K2Cr2O7) acts as oxidizing agent, color changes from
A.	orange to red
B.	orange to green
C.	yellow to green
D.	yellow to red
Answer» D. yellow to red

Discussion

35.	What is the volume strength of H2O2 of its 11.2 ml requires 30 ml of 0.5 M K2Cr2O7?
A.	35
B.	55
C.	25
D.	45
Answer» E.

Discussion

36.	How many moles of KMnO4 are required for complete oxidation of 1.25 mol Cu2S? Cu2S → Cu+2 + SO2
A.	1 mole
B.	3 moles
C.	2 moles
D.	5 moles
Answer» D. 5 moles

Discussion

37.	How many moles of KCI are required to produce 10 mol Cl2 by the reaction with KCIO3?
A.	1.66 mole
B.	13.33 mole
C.	0.66 mole
D.	16.66 mole
Answer» E.

Discussion

38.	What is the concentration of H2O2 solution of 20 ml of H2O2 solution which will react completely with 10 ml of 2 M KMnO4 in acidic medium?
A.	1.25 M
B.	5 M
C.	2.5 M
D.	25 M
Answer» D. 25 M

Discussion

39.	What is the mass of Fe304 if it reacts completely with 25 ml of 0.3m K2Cr2O7?
A.	1 .44 g
B.	10.44 g
C.	104.4 g
D.	14.4 g
Answer» C. 104.4 g

Discussion

40.	What is the volume of 0.05 M KMnO4 which will react with 50 ml of 0.1 M H2S in acidic medium (H2S → S02)?
A.	60 ml
B.	6 ml
C.	12 ml
D.	120 ml
Answer» E.

Discussion

41.	What is the mass of K2Cr2O7 required to produce 254 gm I2 from KI solution? Given: K2Cr2O7 + 2KI → 2Cr3+ + I2
A.	49 g
B.	98 g
C.	9.8 g
D.	4.9 g
Answer» C. 9.8 g

Discussion

42.	How many number of moles of KMnO4 will react with 180 gm H2C2O4 according to given reaction? KMnO4 + H2C2O4 → 2C02 + Mn2+
A.	4/5
B.	2/5
C.	1/5
D.	4/3
Answer» B. 2/5

Discussion

Explore topic-wise MCQs in Maharashtra CET.

In&nbsp;Copper(II)&nbsp;Oxide&nbsp;(CuO)&nbsp;and&nbsp;Carbon&nbsp;Monoxide&nbsp;(CO)&nbsp;reaction,

&nbsp;If&nbsp;Potassium&nbsp;Iodide&nbsp;(KI)&nbsp;acts&nbsp;as&nbsp;oxidizing&nbsp;agent,&nbsp;change&nbsp;occurs&nbsp;from,&nbsp;indicates&nbsp;presence&nbsp;of

At&nbsp;high&nbsp;temperatures,&nbsp;enzymes...

Reducing&nbsp;agents&nbsp;does&nbsp;not&nbsp;include

When&nbsp;dichromate&nbsp;(VI)&nbsp;ion&nbsp;becomes&nbsp;reduced&nbsp;to&nbsp;chromium&nbsp;(III)&nbsp;ion,&nbsp;a&nbsp;change&nbsp;of&nbsp;color&nbsp;occurs&nbsp;from

&nbsp;Exothermic&nbsp;reactions&nbsp;are

&nbsp;Change&nbsp;of&nbsp;orange&nbsp;color&nbsp;of&nbsp;Chromium(VI)&nbsp;(Cr+6)&nbsp;to&nbsp;green&nbsp;color&nbsp;of&nbsp;Chromium(III)&nbsp;(Cr+3)&nbsp;indicates&nbsp;presence&nbsp;of&nbsp;a

Displacement&nbsp;reaction&nbsp;occurs&nbsp;when

A&nbsp;reductant

In&nbsp;electrolysis&nbsp;of&nbsp;copper&nbsp;purification,&nbsp;at&nbsp;cathode

After&nbsp;accepting&nbsp;electrons,&nbsp;Manganate&nbsp;Mn(VII)&nbsp;ion&nbsp;becomes&nbsp;oxidized&nbsp;to

Reaction&nbsp;of&nbsp;Lead&nbsp;Oxide&nbsp;(PbO)&nbsp;and&nbsp;Hydrogen&nbsp;Gas&nbsp;(H2)&nbsp;leads&nbsp;to

While&nbsp;passing&nbsp;hydrogen&nbsp;over&nbsp;heated&nbsp;CuO(s),&nbsp;black&nbsp;color&nbsp;is&nbsp;oxidized&nbsp;to

&nbsp;In&nbsp;a&nbsp;Redox&nbsp;reaction,

&nbsp;Non-metals&nbsp;are&nbsp;good&nbsp;at

In&nbsp;plentiful&nbsp;supply&nbsp;of&nbsp;oxygen&nbsp;or&nbsp;air,&nbsp;burning&nbsp;of&nbsp;carbon&nbsp;gives&nbsp;off

Oxidation&nbsp;is&nbsp;also&nbsp;referred&nbsp;to&nbsp;as

While&nbsp;Iodide&nbsp;ion&nbsp;(I-)&nbsp;oxidizes&nbsp;to&nbsp;Iodine&nbsp;(I2),&nbsp;a&nbsp;change&nbsp;in&nbsp;color&nbsp;from&nbsp;colorless&nbsp;to

&nbsp;In&nbsp;Copper&nbsp;Oxide&nbsp;(CuO)&nbsp;and&nbsp;Carbon&nbsp;Monoxide&nbsp;(CO)&nbsp;reaction

Upon&nbsp;adding&nbsp;sugar&nbsp;in&nbsp;hot&nbsp;drink,&nbsp;slow&nbsp;dissolution&nbsp;is&nbsp;of

While&nbsp;Potassium&nbsp;Iodide&nbsp;(KI)&nbsp;is&nbsp;a&nbsp;powerful&nbsp;reducing&nbsp;agent,

&nbsp;Activation&nbsp;energy&nbsp;can&nbsp;be&nbsp;lowered&nbsp;through&nbsp;use&nbsp;of

&nbsp;Oxidizing&nbsp;agents&nbsp;does&nbsp;not&nbsp;include

Reduction&nbsp;involves

Hydrogen&nbsp;acts&nbsp;as&nbsp;a&nbsp;reducing&nbsp;agent,

&nbsp;In&nbsp;a&nbsp;reaction&nbsp;between&nbsp;CuSO4(s)&nbsp;and&nbsp;Zn(s),

Upon&nbsp;oxidation&nbsp;of&nbsp;acidified&nbsp;potassium&nbsp;manganate&nbsp;(VII),&nbsp;purple&nbsp;color&nbsp;of&nbsp;Manganese

In&nbsp;Copper&nbsp;Oxide&nbsp;(CuO)&nbsp;and&nbsp;Carbon&nbsp;Monoxide&nbsp;(CO)&nbsp;reaction,&nbsp;reducing&nbsp;agent&nbsp;is

Oxidizing&nbsp;agents

Old&nbsp;paintings&nbsp;became&nbsp;discolourised&nbsp;due&nbsp;to

In&nbsp;a&nbsp;reaction&nbsp;between&nbsp;CuSO4(s)&nbsp;and&nbsp;Zn(s),

Oxidation&nbsp;involves

In&nbsp;an&nbsp;acidified&nbsp;solution&nbsp;of&nbsp;Potassium&nbsp;Dichromate(VI)&nbsp;(K2Cr2O7),&nbsp;Dichromate&nbsp;ion&nbsp;(Cr2O7-2)&nbsp;becomes&nbsp;reduced&nbsp;to

&nbsp;If&nbsp;acidified&nbsp;Potassium&nbsp;Dichromate(VI)&nbsp;(K2Cr2O7)&nbsp;acts&nbsp;as&nbsp;oxidizing&nbsp;agent,&nbsp;color&nbsp;changes&nbsp;from

What&nbsp;is&nbsp;the&nbsp;volume&nbsp;strength&nbsp;of&nbsp;H2O2&nbsp;of&nbsp;its&nbsp;11.2&nbsp;ml&nbsp;requires&nbsp;30&nbsp;ml&nbsp;of&nbsp;0.5&nbsp;M&nbsp;K2Cr2O7?

How&nbsp;many&nbsp;moles&nbsp;of&nbsp;KMnO4&nbsp;are&nbsp;required&nbsp;for&nbsp;complete&nbsp;oxidation&nbsp;of&nbsp;1.25&nbsp;mol&nbsp;Cu2S? Cu2S&nbsp;&rarr;&nbsp;Cu+2&nbsp;+&nbsp;SO2

How&nbsp;many&nbsp;moles&nbsp;of&nbsp;KCI&nbsp;are&nbsp;required&nbsp;to&nbsp;produce&nbsp;10&nbsp;mol&nbsp;Cl2&nbsp;by&nbsp;the&nbsp;reaction&nbsp;with&nbsp;KCIO3?

What&nbsp;is&nbsp;the&nbsp;concentration&nbsp;of&nbsp;H2O2&nbsp;solution&nbsp;of&nbsp;20&nbsp;ml&nbsp;of&nbsp;H2O2&nbsp;solution&nbsp;which&nbsp;will&nbsp;react&nbsp;completely&nbsp;with&nbsp;10&nbsp;ml&nbsp;of&nbsp;2&nbsp;M&nbsp;KMnO4&nbsp;in&nbsp;acidic&nbsp;medium?

What&nbsp;is&nbsp;the&nbsp;mass&nbsp;of&nbsp;Fe304&nbsp;if&nbsp;it&nbsp;reacts&nbsp;completely&nbsp;with&nbsp;25&nbsp;ml&nbsp;of&nbsp;0.3m&nbsp;K2Cr2O7?

What&nbsp;is&nbsp;the&nbsp;volume&nbsp;of&nbsp;0.05&nbsp;M&nbsp;KMnO4&nbsp;which&nbsp;will&nbsp;react&nbsp;with&nbsp;50&nbsp;ml&nbsp;of&nbsp;0.1&nbsp;M&nbsp;H2S&nbsp;in&nbsp;acidic&nbsp;medium&nbsp;(H2S&nbsp;&rarr;&nbsp;S02)?

What&nbsp;is&nbsp;the&nbsp;mass&nbsp;of&nbsp;K2Cr2O7&nbsp;required&nbsp;to&nbsp;produce&nbsp;254&nbsp;gm&nbsp;I2&nbsp;from&nbsp;KI&nbsp;solution?&nbsp;Given:&nbsp;K2Cr2O7&nbsp;+&nbsp;2KI&nbsp;&rarr;&nbsp;2Cr3+&nbsp;+&nbsp;I2

How&nbsp;many&nbsp;number&nbsp;of&nbsp;moles&nbsp;of&nbsp;KMnO4&nbsp;will&nbsp;react&nbsp;with&nbsp;180&nbsp;gm&nbsp;H2C2O4&nbsp;according&nbsp;to&nbsp;given&nbsp;reaction? KMnO4&nbsp;+&nbsp;H2C2O4&nbsp;&rarr;&nbsp;2C02&nbsp;+&nbsp;Mn2+

In Copper(II) Oxide (CuO) and Carbon Monoxide (CO) reaction,

If Potassium Iodide (KI) acts as oxidizing agent, change occurs from, indicates presence of

At high temperatures, enzymes...

Reducing agents does not include

When dichromate (VI) ion becomes reduced to chromium (III) ion, a change of color occurs from

Exothermic reactions are

Change of orange color of Chromium(VI) (Cr+6) to green color of Chromium(III) (Cr+3) indicates presence of a

Displacement reaction occurs when

A reductant

In electrolysis of copper purification, at cathode

After accepting electrons, Manganate Mn(VII) ion becomes oxidized to

Reaction of Lead Oxide (PbO) and Hydrogen Gas (H2) leads to

While passing hydrogen over heated CuO(s), black color is oxidized to

In a Redox reaction,

Non-metals are good at

In plentiful supply of oxygen or air, burning of carbon gives off

Oxidation is also referred to as

While Iodide ion (I-) oxidizes to Iodine (I2), a change in color from colorless to

In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction

Upon adding sugar in hot drink, slow dissolution is of

While Potassium Iodide (KI) is a powerful reducing agent,

Activation energy can be lowered through use of

Oxidizing agents does not include

Reduction involves

Hydrogen acts as a reducing agent,

In a reaction between CuSO4(s) and Zn(s),

Upon oxidation of acidified potassium manganate (VII), purple color of Manganese

In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction, reducing agent is

Oxidizing agents

Old paintings became discolourised due to

In a reaction between CuSO4(s) and Zn(s),

Oxidation involves

In an acidified solution of Potassium Dichromate(VI) (K2Cr2O7), Dichromate ion (Cr2O7-2) becomes reduced to

If acidified Potassium Dichromate(VI) (K2Cr2O7) acts as oxidizing agent, color changes from

What is the volume strength of H2O2 of its 11.2 ml requires 30 ml of 0.5 M K2Cr2O7?

How many moles of KMnO4 are required for complete oxidation of 1.25 mol Cu2S? Cu2S → Cu+2 + SO2

How many moles of KCI are required to produce 10 mol Cl2 by the reaction with KCIO3?

What is the concentration of H2O2 solution of 20 ml of H2O2 solution which will react completely with 10 ml of 2 M KMnO4 in acidic medium?

What is the mass of Fe304 if it reacts completely with 25 ml of 0.3m K2Cr2O7?

What is the volume of 0.05 M KMnO4 which will react with 50 ml of 0.1 M H2S in acidic medium (H2S → S02)?

What is the mass of K2Cr2O7 required to produce 254 gm I2 from KI solution? Given: K2Cr2O7 + 2KI → 2Cr3+ + I2

How many number of moles of KMnO4 will react with 180 gm H2C2O4 according to given reaction? KMnO4 + H2C2O4 → 2C02 + Mn2+