2539 + Mcqs in Chemistry Page 40 McqOptions

1951.	____ Solution is used to treat bee sting
A.	Lemon juice
B.	Milk
C.	Vinegar
D.	Baking soda
Answer» E.

Discussion

1952.	Fats and oils become rancid because of:
A.	transpiration
B.	reduction
C.	oxidation
D.	corrosion
Answer» D. corrosion

Discussion

1953.	_________ double bond(s) is/are present in one molecule of Benzene.
A.	3
B.	1
C.	2
D.	4
Answer» B. 1

Discussion

1954.	Glucose and fructose are example of
A.	Isotopes
B.	Isotones
C.	Isobars
D.	Isomers
Answer» E.

Discussion

1955.	Molecular formula of gold is _________
A.	Au
B.	Ag
C.	G
D.	AI
Answer» B. Ag

Discussion

1956.	Oxidation number of oxygen in ozone is _______.
A.	0
B.	-2
C.	+2
D.	-6
Answer» B. -2

Discussion

1957.	Leaching method is suitable for the concentration of the following ore:
A.	Calamine
B.	Cinnabar
C.	Cassiterite
D.	Argentite
Answer» E.

Discussion

1958.	Calcium Hydroxide is also known as _________.
A.	Plaster
B.	Slaked lime
C.	Baking soda
D.	Washing soda
Answer» C. Baking soda

Discussion

1959.	________contributes towards global warming so it is called a greenhouse gas.
A.	Oxygen
B.	Nitrogen
C.	Hydrogen
D.	Methane
Answer» E.

Discussion

1960.	Acidic solutions in water conduct electricity because they produce ________.
A.	Sulphide ions
B.	Chloride ions
C.	Hydrogen ions
D.	Hydroxide ions
Answer» D. Hydroxide ions

Discussion

1961.	Galvanising means covering steel with a thin layer of ______.
A.	Chromium
B.	Zinc
C.	Aluminium
D.	Nickel
Answer» C. Aluminium

Discussion

1962.	Cryogenic refers to ______.A. Low temperatureB. High temperatureC. Low pressureD. High pressure
A.	B
B.	D
C.	A
D.	C
Answer» D. C

Discussion

1963.	A compound has the molecular formula C2H6O. The name of the compound is-
A.	Ethanol
B.	Both dimethyl ether and ethanol
C.	Ethanoic acid
D.	Dimethyl ether
Answer» C. Ethanoic acid

Discussion

1964.	If a non-volatile solute will be added in benzene at 30 °C, its vapour pressure will
A.	increases
B.	decreases
C.	remains same
D.	depend upon solute
Answer» C. remains same

Discussion

1965.	Nitriles on hydrolysis give a compound 'X’ which on reaction with H+ or OH- gives Y. When Y is diluted to 5-10%, it is known as a:
A.	Wash
B.	Azo dye
C.	Rectified spirit
D.	Vinegar
Answer» E.

Discussion

1966.	Muscle fatigue is due to the accumulation of:
A.	Cholesterol
B.	Lactic acid
C.	Lipoic acid
D.	Triglycerides
Answer» C. Lipoic acid

Discussion

1967.	Emulsion is know as a
A.	colloidal solution of substances having different physical states
B.	true solution
C.	distillation mixture for making alcohols
D.	colloidal solution of two liquids
Answer» E.

Discussion

1968.	For the chemical reaction, ⇌ Y, the standard reaction Gibbs energy depends on temperature T (in K) as \(\;{\Delta _r}\;G^\circ \left( {\;in\;kJ\;mo{l^{ - 1}}} \right) = 120 - \frac{3}{8}\;T\). The major component of the reaction mixture at T is
A.	Y if T = 280 K
B.	X if T = 350 K
C.	X if T = 315 K
D.	Y if T = 300 K
Answer» D. Y if T = 300 K

Discussion

1969.	A electric bulb has a filament made of ________.
A.	Iron
B.	Lead
C.	Copper
D.	Tungsten
Answer» E.

Discussion

1970.	Atomic number of an element is equal to the number of ____ in the nucleus.
A.	Electrons and protons
B.	Neutrons
C.	Electron
D.	Protons
Answer» E.

Discussion

1971.	In the Mendeleev periodic table, gaps were left for the undiscovered elements. Which of the following elements found a place in the periodic table later ?
A.	F
B.	Mg
C.	Ge
D.	Ca
Answer» D. Ca

Discussion

1972.	Find out the molarity of 10% of NAOH solution
A.	1.5M
B.	5M
C.	2.5M
D.	0.1M
Answer» D. 0.1M

Discussion

1973.	Mass numbers of elements are always whole numbers but Atomic masses are not. This is due to the existence of
A.	Allotropes
B.	Isotopes
C.	Isobars
D.	Isomers
Answer» C. Isobars

Discussion

1974.	If the first and third members of a Doberiner triad are Phosphorus and Antimony, the second member of this triad is:
A.	Iodine
B.	Sulphur
C.	Calcium
D.	Arsenic
Answer» E.

Discussion

1975.	Common salt (NaCl) is not used as a raw material for preparation of which one of the following compounds?
A.	Bleaching powder
B.	Baking soda
C.	Plaster of Paris
D.	Washing soda
Answer» D. Washing soda

Discussion

1976.	Deposition of bluish - green colour substance on copper-utensils occurs due to the formation of the following:
A.	CuCO3
B.	Cu(OH)2
C.	Cu(OH)2 . CuCO3
D.	CuO
Answer» E.

Discussion

1977.	________ is an ore of mercury.
A.	Magnetite
B.	Cinnabar
C.	Hematite
D.	Bauxite
Answer» C. Hematite

Discussion

1978.	Plaster of Paris is stored in a:
A.	Metal containers
B.	Moisture-proof container
C.	Insulated containers
D.	Glass containers
E.	None of the above/More than one of the above
Answer» C. Insulated containers

Discussion

1979.	Noble gases are ________.
A.	Monoatomic
B.	Polyatomic
C.	Triatomic
D.	Diatomic
Answer» B. Polyatomic

Discussion

1980.	Neutral solution is one which has pH value
A.	Greater than 7
B.	Equal to 7
C.	Less than 7
D.	None of the above
Answer» C. Less than 7

Discussion

1981.	In laboratory, ethylene and acetylene can be distinguished by
A.	Br2/H2O
B.	KMnO4/OH⊖/H2O
C.	Tollens reagent
D.	Fehling solution
Answer» D. Fehling solution

Discussion

1982.	A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 0.01; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:
A.	Zn
B.	Fe
C.	Mn
D.	Cu
Answer» D. Cu

Discussion

1983.	Napthaline ball disappears after some days due to the process of :
A.	sublimation
B.	melting and evaporation
C.	melting
D.	evaporation
Answer» B. melting and evaporation

Discussion

1984.	For the reaction 2A + B → C, the values of initial rate at different reactant concentrations are given in the table below. The rate law for the reaction is:[A] (molL-1)[B] (molL-1)Initial Rate(molL-1 S-1)0.050.050.0450.100.050.0900.200.100.72
A.	Rate = k[A][B]2
B.	Rate = k[A]2 [B]2
C.	Rate = k[A][B]
D.	Rate = k[A]2 [B]
Answer» B. Rate = k[A]2 [B]2

Discussion

1985.	In nuclear reactors, graphite is used as a/an
A.	Fuel
B.	Lubricant
C.	Moderator
D.	Insulator
Answer» D. Insulator

Discussion

1986.	Among the following reaction of hydrogen with halogens, the one that requires a catalyst is
A.	H2 + Cl2 → 2HCl
B.	H2 + I2 → 2HI
C.	H2 + F2 → 2HF
D.	H2 + Br2 → 2HBr
Answer» C. H2 + F2 → 2HF

Discussion

1987.	Methyl propane is an isomer of:
A.	n-hexane
B.	n-pentane
C.	n-propane
D.	n-butane
Answer» E.

Discussion

1988.	For the reaction 2A + B → Products, when the concentrations of A and B both were doubled, the rate of the reaction increased from 0.3 mol L-1 S-1 to 2.4 mol L-1 S-1. When the concentration of A alone is doubled, the rate increased from 0.3 mol L-1 S-1 to 0.6 mol L-1 S-1.Which one of the following statements is correct?
A.	Total order of the reaction is 4
B.	Order of the reaction with respect to B is 2
C.	Order of the reaction with respect to B is 1
D.	Order of the reaction with respect to A is 2
Answer» C. Order of the reaction with respect to B is 1

Discussion

1989.	HF has highest boiling point among hydrogen halides, because it has:
A.	Strongest van der Waals’ interactions
B.	Lowest ionic character
C.	Strongest hydrogen bonding
D.	Lowest dissociation enthalpy
Answer» D. Lowest dissociation enthalpy

Discussion

1990.	Ortho and Para hydrogen differ in-
A.	Spin of their e-
B.	atomic mass
C.	Spin of their p+
D.	atomic number
Answer» D. atomic number

Discussion

1991.	________ is one of the states of matter obtained by cooling a gas of very low density to extremely low temperatures.A. GasB. PlasmaC. Bose-Einstein Condensate (BEC)D. Plasma Condensate
A.	C
B.	B
C.	A
D.	D
Answer» B. B

Discussion

1992.	A change of state from one from to other is a
A.	biological change
B.	chemical change
C.	physical change
D.	None of the above
Answer» D. None of the above

Discussion

1993.	On dilution the conductivity and equivalent conductivity of KCl changes respectively
A.	decreases, decreases
B.	increases, decreases
C.	decreases, increases
D.	increases, increases
Answer» D. increases, increases

Discussion

1994.	Graphene is ________.
A.	An alloy of carbon
B.	Nano structure of carbon
C.	Isotope of carbon
D.	None of the above
Answer» C. Isotope of carbon

Discussion

1995.	In safety matches, the matchstick consists of a mixture of antimony trisulphide and which other compounds?
A.	Potassium sulphide
B.	Potassium chlorate
C.	Choric acid
D.	Magnesium chloride
Answer» C. Choric acid

Discussion

1996.	Conversion of CH3C ≡ CH to CH3CH = CH2 needs
A.	Lindlar catalyst
B.	H2/Pd
C.	NaBH4
D.	LiAlH4
Answer» B. H2/Pd

Discussion

1997.	Natural rubber is a polymer of ______.
A.	Propene
B.	Isoprene
C.	Formaldehyde
D.	Phenol
Answer» C. Formaldehyde

Discussion

1998.	Chemical formula of Ozone is ________.
A.	H2O2
B.	O2
C.	O3
D.	NH3
Answer» D. NH3

Discussion

1999.	Bleaching powder used in Fish pond is working as:
A.	Disinfectant
B.	Sterelent
C.	Snail Controller
D.	Parasticide
Answer» B. Sterelent

Discussion

2000.	How many elements are there in the periodic table such that for every element name there is a single alphabet that symbolically represents it (for example, B-Boron, C-Carbon, etc)?
A.	7
B.	17
C.	14
D.	10
Answer» D. 10

Discussion

Explore topic-wise MCQs in Current Affairs.

____ Solution is used to treat bee sting

Fats and oils become rancid because of:

_________ double bond(s) is/are present in one molecule of Benzene.

Glucose and fructose are example of

Molecular formula of gold is _________

Oxidation number of oxygen in ozone is _______.

Leaching method is suitable for the concentration of the following ore:

Calcium Hydroxide is also known as _________.

________contributes towards global warming so it is called a greenhouse gas.

Acidic solutions in water conduct electricity because they produce ________.

Galvanising means covering steel with a thin layer of ______.

Cryogenic refers to ______.A. Low temperatureB. High temperatureC. Low pressureD. High pressure

A compound has the molecular formula C2H6O. The name of the compound is-

If a non-volatile solute will be added in benzene at 30 °C, its vapour pressure will

Nitriles on hydrolysis give a compound 'X’ which on reaction with H+ or OH- gives Y. When Y is diluted to 5-10%, it is known as a:

Muscle fatigue is due to the accumulation of:

Emulsion is know as a

For the chemical reaction, ⇌ Y, the standard reaction Gibbs energy depends on temperature T (in K) as \(\;{\Delta _r}\;G^\circ \left( {\;in\;kJ\;mo{l^{ - 1}}} \right) = 120 - \frac{3}{8}\;T\). The major component of the reaction mixture at T is

A electric bulb has a filament made of ________.

Atomic number of an element is equal to the number of ____ in the nucleus.

In the Mendeleev periodic table, gaps were left for the undiscovered elements. Which of the following elements found a place in the periodic table later ?

Find out the molarity of 10% of NAOH solution

Mass numbers of elements are always whole numbers but Atomic masses are not. This is due to the existence of

If the first and third members of a Doberiner triad are Phosphorus and Antimony, the second member of this triad is:

Common salt (NaCl) is not used as a raw material for preparation of which one of the following compounds?

Deposition of bluish - green colour substance on copper-utensils occurs due to the formation of the following:

________ is an ore of mercury.

Plaster of Paris is stored in a:

Noble gases are ________.

Neutral solution is one which has pH value

In laboratory, ethylene and acetylene can be distinguished by

A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 0.01; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:

Napthaline ball disappears after some days due to the process of :

For the reaction 2A + B → C, the values of initial rate at different reactant concentrations are given in the table below. The rate law for the reaction is:[A] (molL-1)[B] (molL-1)Initial Rate(molL-1 S-1)0.050.050.0450.100.050.0900.200.100.72

In nuclear reactors, graphite is used as a/an

Among the following reaction of hydrogen with halogens, the one that requires a catalyst is

Methyl propane is an isomer of:

HF has highest boiling point among hydrogen halides, because it has:

Ortho and Para hydrogen differ in-

________ is one of the states of matter obtained by cooling a gas of very low density to extremely low temperatures.A. GasB. PlasmaC. Bose-Einstein Condensate (BEC)D. Plasma Condensate

A change of state from one from to other is a

On dilution the conductivity and equivalent conductivity of KCl changes respectively

Graphene is ________.

In safety matches, the matchstick consists of a mixture of antimony trisulphide and which other compounds?

Conversion of CH3C ≡ CH to CH3CH = CH2 needs

Natural rubber is a polymer of ______.

Chemical formula of Ozone is ________.

Bleaching powder used in Fish pond is working as:

How many elements are there in the periodic table such that for every element name there is a single alphabet that symbolically represents it (for example, B-Boron, C-Carbon, etc)?