2539 + Mcqs in Chemistry Page 20 McqOptions

951.	Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with ________.
A.	Carbon and Hydrogen
B.	Carbon and Sodium
C.	Hydrogen and Sodium
D.	Hydrogen and Oxygen
Answer» E.

Discussion

952.	A solution of Ni(NO3)2 is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many moles of Ni will be deposited at the cathode?
A.	0.05
B.	0.20
C.	0.15
D.	0.10
Answer» B. 0.20

Discussion

953.	For alkali metals, which one of the following trends is incorrect?
A.	Ionisation energy : Li > Na > K > Rb
B.	Atomic size : Li < Na < K < Rb
C.	Density : Li < Na < K < Rb
D.	Hydration energy : Li > Na > K > Rb
Answer» D. Hydration energy : Li > Na > K > Rb

Discussion

954.	According to Dalton, atoms of a given element have
A.	Identical mass, size and shape.
B.	Identical mass, size and different shape.
C.	Identical mass but different size and shape.
D.	Identical size and shape but different mass.
Answer» B. Identical mass, size and different shape.

Discussion

955.	Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moment is:
A.	V2+ < Ti2 + < Ti3+ < Sc3+
B.	Sc3+ < Ti3+ < Ti2+ < V2+
C.	Ti3+ < Ti2+ < Sc3+ < V2+
D.	Sc3+ < Ti3+ < V2+ < Ti2+
Answer» C. Ti3+ < Ti2+ < Sc3+ < V2+

Discussion

956.	Composting of organic matter involves
A.	Anaerobic digestion
B.	Aerobic digestion
C.	Fermentation
D.	Combustion
Answer» C. Fermentation

Discussion

957.	Photo receptors of a printer or a photocopy machine is made of which element?
A.	Amorphous Phosphorous
B.	Caesium
C.	Amorphous Silicon
D.	Berkelium
Answer» D. Berkelium

Discussion

958.	Consider the following reactions:‘A’ is
A.	CH≡CH
B.	CH3-C≡C-CH
C.	CH3-C≡CH
D.	CH2=CH2
Answer» D. CH2=CH2

Discussion

959.	An
A.	A hydrogen molecule
B.	A helium nucleus
C.	An atom of hydrogen
D.	A proton
Answer» C. An atom of hydrogen

Discussion

960.	Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is:
A.	A2BO4
B.	AB2O4
C.	A2B2O
D.	A4B2O
Answer» C. A2B2O

Discussion

961.	Intermolecular spaces are minimum in ________.
A.	gold
B.	air
C.	alcohol
D.	water
Answer» B. air

Discussion

962.	________ the correct formula for ammonium phosphate.
A.	N4H6PO4
B.	(NH4)3PO
C.	(NH4)3PO4
D.	(NH4)2PO4
Answer» D. (NH4)2PO4

Discussion

963.	Maximum Paramagnetism shown by the following tripositive ion is:
A.	La3+
B.	Lu3+
C.	Nd3+
D.	Ce3+
Answer» B. Lu3+

Discussion

964.	Brass gets tarnished in air due to the presence of which of the following gases in air?
A.	Nitrogen
B.	Carbon dioxide
C.	Hydrogen sulfide
D.	Carbon monoxide
Answer» D. Carbon monoxide

Discussion

965.	Among the following elements which has the lowest melting point?
A.	Titanium
B.	Sulphur
C.	Argon
D.	Zinc
Answer» D. Zinc

Discussion

966.	Bauxite is ore of
A.	Iron
B.	Aluminium
C.	Silver
D.	Zinc
Answer» C. Silver

Discussion

967.	Match the refining methods (Column I) with metals (Column II)Column IColumn II(Refining methods)(Metals)(I) Liquation(a) Zr(II) Zone Refining(b) Ni(III) Mond Process(c) Sn(IV) Van Arkel Method(d) Ga
A.	(I)-(c); (II)-a); (III)-(b); (IV)-(d)
B.	(I)-(b); (II)-(c); (III)-(d); (IV)-(a)
C.	(I)-(c); (II)-(d); (III)-(b); (IV)-(a)
D.	(I)-(b); (II)-(d); (III)-(a); (IV)-(c)
Answer» D. (I)-(b); (II)-(d); (III)-(a); (IV)-(c)

Discussion

968.	Drinking soda is _________.
A.	An oxidizing agent
B.	Basic in nature
C.	Neutral
D.	Acidic in nature
Answer» E.

Discussion

969.	An autocatalyst is
A.	One which speeds up the catalyst action
B.	One of the products of a reaction acts as a catalyst
C.	One of the reactants act as catalyst
D.	Bot the reactants act as a catalyst
Answer» C. One of the reactants act as catalyst

Discussion

970.	A powerful eye irritant in the smoke is
A.	Ozone
B.	Sulphur dioxide
C.	Carbon dioxide
D.	Peroxyacetyle nitrate
Answer» E.

Discussion

971.	Given the equilibrium constant (Kc) of the reaction:Cu(s) + 2Ag+ (aq) → Cu2+ (aq) + 2Ag(s) is 10 × 1015, calculate the \(E{^\circ _{cell}}\) of this reaction at 298 K.\(\left[ {2.303\frac{{RT}}{F}at\;298\;K = 0.059\;V} \right]\)
A.	0.4736 V
B.	0.4736 mV
C.	0.4736 Mv
D.	0.04736 V
Answer» B. 0.4736 mV

Discussion

972.	Limewater is turned milky by
A.	CO
B.	CO2
C.	O2
D.	O3
E.	None of the above / More than one of the above
Answer» C. O2

Discussion

973.	A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are:
A.	Washing soda and soda ash.
B.	Baking soda and dead burnt plaster.
C.	Washing soda and dead burnt plaster.
D.	Baking soda and soda ash.
Answer» B. Baking soda and dead burnt plaster.

Discussion

974.	Excessive release of CO2 into the atmosphere results in:
A.	Global warming
B.	Polar vortex
C.	Formation of Smog
D.	Depletion of Ozone
Answer» B. Polar vortex

Discussion

975.	Number of Neutrons in heavy hydrogen atom are ___________?
A.	1
B.	2
C.	3
D.	0
Answer» B. 2

Discussion

976.	Each consecutive member of the family of hydrocarbons differs from the previous member by the ______ group.
A.	Methylene
B.	Ethyl
C.	Methyl
D.	Ethylene
Answer» B. Ethyl

Discussion

977.	Granite is an example of _______.
A.	Metamorphic rock
B.	Sedimentary rock
C.	Igneous rock
D.	Artificial stone
Answer» D. Artificial stone

Discussion

978.	Buckminsterfullerene is an allotrope of _______.
A.	Boron
B.	Iron
C.	Carbon
D.	Phosphorus
Answer» D. Phosphorus

Discussion

979.	Presence of —OH group in an inorganic compound may lead to
A.	alkali
B.	base
C.	acid
D.	All of the above
Answer» C. acid

Discussion

980.	A rail track is usually welded by
A.	Arc welding
B.	oxy hydrogen flame
C.	Thermite welding
D.	None of these
Answer» D. None of these

Discussion

981.	25 mL of the given HCl solution requires 30mL of 0.1M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30mL of 0.2M aqueous NaOH solution?
A.	75 ml
B.	25 ml
C.	12.5 ml
D.	50 ml
Answer» C. 12.5 ml

Discussion

982.	In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the changes of pH of the titration mixture in this experiment?(1) (2) (3) (4)
A.	(2)
B.	(1)
C.	(3)
D.	(4)
Answer» C. (3)

Discussion

983.	Litmus is obtained from
A.	A bacterium
B.	A fungus
C.	Alga
D.	Lichen
Answer» E.

Discussion

984.	In which of the following options is oxalic acid most likely to be found?
A.	Spinach
B.	Vinegar
C.	Tamarind
D.	Curd
Answer» B. Vinegar

Discussion

985.	Number of σ and π bonds in benzene, respectively, is:
A.	12 and 3
B.	3 and 3
C.	6 and 3
D.	9 and 3
Answer» B. 3 and 3

Discussion

986.	Methane is known as________.
A.	Laughing gas
B.	Tear gas
C.	Marsh gas
D.	Non - greenhouse gas
Answer» D. Non - greenhouse gas

Discussion

987.	In the Modern Periodic Table, which period contains 32 elements?
A.	Period 6
B.	Period 3
C.	Period 4
D.	Period 5
Answer» B. Period 3

Discussion

988.	Atomicity of inert gases are-
A.	1
B.	3
C.	2
D.	4
Answer» B. 3

Discussion

989.	Bright light is found to emit from photographer’s flashgun. This brightness is due to the presence of which one of the following noble gases?
A.	Argon
B.	Xenon
C.	Neon
D.	Helium
Answer» C. Neon

Discussion

990.	All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3 : 8. This is an agreement with the Law of ______.
A.	Conservation of Mass
B.	Constant Proportion
C.	Reciprocal proportion
D.	Conservation of Energy
Answer» C. Reciprocal proportion

Discussion

991.	Lightest gas is ________.
A.	N
B.	O
C.	H
D.	CO2
Answer» D. CO2

Discussion

992.	Primarily which kind of acid is present in an apple?
A.	Citric acid
B.	Lactic acid
C.	Tartaric acid
D.	Malic acid
Answer» E.

Discussion

993.	In which process is a protective zinc coating applied on iron to prevent it from rusting?
A.	Galvanisation
B.	Annealing
C.	Smelting
D.	Welding
Answer» B. Annealing

Discussion

994.	A homogeneous mixture of two or more substances is known as the-
A.	Solution
B.	Fission
C.	Colloids
D.	Suspension
Answer» B. Fission

Discussion

995.	nx mole of substance x was dissolved in ny mole of substance y.A. The total of mole fractions of substance x and y remain 1.B. Mole fraction of \(\rm x=\dfrac{\rm No. \ of \ moles \ of \ x}{\rm No. \ of \ moles \ of \ solution}\)C. Mole fraction of \(\rm y = \dfrac{n_y}{n_x + n_y}\)D. Mole fraction of \(\rm x = \dfrac{n_x}{n_y + n_y}\)
A.	Only A
B.	Only A, B
C.	A, B and C
D.	Only D
Answer» D. Only D

Discussion

996.	During rusting of iron, ______ on iron.
A.	Brown blue powder is coated.
B.	Black is coated.
C.	Green is coated.
D.	Red brown powder is coated.
Answer» E.

Discussion

997.	An emulsion consists of
A.	One liquid and one solid
B.	One liquid and one gas
C.	Two liquids
D.	Two solids
Answer» D. Two solids

Discussion

998.	If we add salt to pure water, its boiling point will
A.	Increase
B.	decrease
C.	remains same
D.	None of the above
Answer» B. decrease

Discussion

999.	Assertion: Ozone is destroyed by CFCs in the upper stratosphere.Reason: Ozone holes increase the amount of UV radiation reaching the earth.
A.	Assertion and reason are incorrect
B.	Assertion and reason are both correct, and the reason is the correct explanation for the assertion.
C.	Assertion and reason are correct, but the reason is not the explanation for the assertion.
D.	Assertion is false, but the reason is correct.
Answer» D. Assertion is false, but the reason is correct.

Discussion

1000.	If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction:Zn (s) + Cu2+ (aq) ⇌ Zn2+ (aq) + Cu (s)At 300 K is approximately(R = 8 JK-1 mol-1, F = 96000 C mol-1)
A.	e-80
B.	e-160
C.	e320
D.	e160
Answer» E.

Discussion

Explore topic-wise MCQs in Current Affairs.

Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with ________.

A solution of Ni(NO3)2 is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many moles of Ni will be deposited at the cathode?

For alkali metals, which one of the following trends is incorrect?

According to Dalton, atoms of a given element have

Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moment is:

Composting of organic matter involves

Photo receptors of a printer or a photocopy machine is made of which element?

Consider the following reactions:‘A’ is

An

Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is:

Intermolecular spaces are minimum in ________.

________ the correct formula for ammonium phosphate.

Maximum Paramagnetism shown by the following tripositive ion is:

Brass gets tarnished in air due to the presence of which of the following gases in air?

Among the following elements which has the lowest melting point?

Bauxite is ore of

Match the refining methods (Column I) with metals (Column II)Column IColumn II(Refining methods)(Metals)(I) Liquation(a) Zr(II) Zone Refining(b) Ni(III) Mond Process(c) Sn(IV) Van Arkel Method(d) Ga

Drinking soda is _________.

An autocatalyst is

A powerful eye irritant in the smoke is

Given the equilibrium constant (Kc) of the reaction:Cu(s) + 2Ag+ (aq) → Cu2+ (aq) + 2Ag(s) is 10 × 1015, calculate the \(E{^\circ _{cell}}\) of this reaction at 298 K.\(\left[ {2.303\frac{{RT}}{F}at\;298\;K = 0.059\;V} \right]\)

Limewater is turned milky by

A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are:

Excessive release of CO2 into the atmosphere results in:

Number of Neutrons in heavy hydrogen atom are ___________?

Each consecutive member of the family of hydrocarbons differs from the previous member by the ______ group.

Granite is an example of _______.

Buckminsterfullerene is an allotrope of _______.

Presence of —OH group in an inorganic compound may lead to

A rail track is usually welded by

25 mL of the given HCl solution requires 30mL of 0.1M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30mL of 0.2M aqueous NaOH solution?

In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the changes of pH of the titration mixture in this experiment?(1) (2) (3) (4)

Litmus is obtained from

In which of the following options is oxalic acid most likely to be found?

Number of σ and π bonds in benzene, respectively, is:

Methane is known as________.

In the Modern Periodic Table, which period contains 32 elements?

Atomicity of inert gases are-

Bright light is found to emit from photographer’s flashgun. This brightness is due to the presence of which one of the following noble gases?

All samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3 : 8. This is an agreement with the Law of ______.

Lightest gas is ________.

Primarily which kind of acid is present in an apple?

In which process is a protective zinc coating applied on iron to prevent it from rusting?

A homogeneous mixture of two or more substances is known as the-

During rusting of iron, ______ on iron.

An emulsion consists of

If we add salt to pure water, its boiling point will

Assertion: Ozone is destroyed by CFCs in the upper stratosphere.Reason: Ozone holes increase the amount of UV radiation reaching the earth.

If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant (K) for the reaction:Zn (s) + Cu2+ (aq) ⇌ Zn2+ (aq) + Cu (s)At 300 K is approximately(R = 8 JK-1 mol-1, F = 96000 C mol-1)