11242 + Mcqs in Chemistry Page 168 McqOptions

8351.	The osmotic pressure of which solution is maximum (consider that deci-molar solution of each 90% dissociated) [MP PMT 2003]
A.	Aluminium sulphate
B.	Barium chloride
C.	Sodium sulphate
D.	A mixture of equal volumes of B and C
Answer» B. Barium chloride

Discussion

8352.	The aqueous solution of which one of the following is basic [MP PMT 2001]
A.	\[HOCl\]
B.	\[NaHS{{O}_{4}}\]
C.	\[N{{H}_{4}}N{{O}_{3}}\]
D.	\[NaOCl\]
Answer» E.

Discussion

8353.	In a homogeneous catalysis
A.	The catalyst and the reactants should be gases
B.	The catalyst and the reactants should form a single phase
C.	Catalyst and the reactants are all solids
D.	The catalyst and the reactions are all liquids
Answer» C. Catalyst and the reactants are all solids

Discussion

8354.	Ethylene is prepared by the dehydration of [CPMT 1974, 79; DPMT 1985; BHU 1989]
A.	Ethyl alcohol
B.	Methyl alcohol
C.	Acetic acid
D.	Oxalic acid
Answer» B. Methyl alcohol

Discussion

8355.	The law formulated by Dr. Nernst is [Kerala (Med.) 2002]
A.	First law of thermodynamics
B.	Second law of thermodynamics
C.	Third law of thermodynamics
D.	Both A and B
Answer» D. Both A and B

Discussion

8356.	Which characteristic is true in respect of colloidal particle [CPMT 1993; UPSEAT 2000]
A.	They always have two phases
B.	They are only in liquid state
C.	They can't be electrolysed
D.	They are only hydrophilic
Answer» B. They are only in liquid state

Discussion

8357.	\[C{{H}_{2}}=CHCl\] reacts with HCl to form [CPMT 1985, 93]
A.	\[C{{H}_{2}}Cl-C{{H}_{2}}Cl\]
B.	\[C{{H}_{3}}-CHC{{l}_{2}}\]
C.	\[C{{H}_{2}}=CHCl.HCl\]
D.	None of these
Answer» C. \[C{{H}_{2}}=CHCl.HCl\]

Discussion

8358.	Prussian blue is due to the formation of [BHU 1980; CBSE PMT 1990; KCET 1992; MP PET 1995]
A.	\[F{{e}_{4}}{{\left[ Fe{{(CN)}_{6}} \right]}_{3}}\]
B.	\[F{{e}_{2}}\left[ Fe{{(CN)}_{6}} \right]\]
C.	\[F{{e}_{3}}\left[ Fe{{(CN)}_{6}} \right]\]
D.	\[Fe{{\left[ Fe{{(CN)}_{6}} \right]}_{3}}\]
Answer» B. \[F{{e}_{2}}\left[ Fe{{(CN)}_{6}} \right]\]

Discussion

8359.	Which of the following compound expected to be colourless
A.	\[ScO\]
B.	\[{{V}_{2}}{{O}_{3}}\]
C.	\[CuCN\]
D.	\[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
Answer» D. \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]

Discussion

8360.	Lindane can be obtained by reaction of benzene with [DCE 2000]
A.	\[C{{H}_{3}}Cl\]/anhy.\[AlC{{l}_{3}}\]
B.	\[C{{l}_{2}}\]/sunlight
C.	\[{{C}_{2}}{{H}_{5}}I\]/anhy.\[AlC{{l}_{3}}\]
D.	\[C{{H}_{3}}COCl/AlC{{l}_{3}}\]
Answer» C. \[{{C}_{2}}{{H}_{5}}I\]/anhy.\[AlC{{l}_{3}}\]

Discussion

8361.	Mixing of non-reacting gases is generally accompanied by
A.	Decrease in entropy
B.	Increase in entropy
C.	Change in enthalpy
D.	Change in free energy
Answer» C. Change in enthalpy

Discussion

8362.	Six protons are found in the nucleus of [CPMT 1977, 80, 81; NCERT 1975, 78]
A.	Boron
B.	Lithium
C.	Carbon
D.	Helium
Answer» D. Helium

Discussion

8363.	The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is [UPSEAT 2001]
A.	7
B.	6
C.	5
D.	3
Answer» B. 6

Discussion

8364.	The calorific values of fats, carbohydrates and proteins vary in the order
A.	Fats > Carbohydrates > Proteins
B.	Fats > Proteins > Carbohydrates
C.	Carbohydrates > Proteins > Fats
D.	Proteins > Carbohydrates > Fats
Answer» B. Fats > Proteins > Carbohydrates

Discussion

8365.	Electrolysis of cold concentrated aqueous solution of potassium succinate yields [CPMT 1985; MP PMT 1986]
A.	Ethane
B.	Ethyne
C.	Ethene
D.	Ethane-1, 2-diol
Answer» D. Ethane-1, 2-diol

Discussion

8366.	\[pH\]of water is 7. When a substance \[Y\]is dissolved in water, the \[pH\]becomes 13. The substance \[Y\]is a salt of [MP PMT 1997]
A.	Strong acid and strong base
B.	Weak acid and weak base
C.	Strong acid and weak base
D.	Weak acid and strong base
Answer» E.

Discussion

8367.	The tetrahedral nature of carbon was first given by [MP PMT 1994]
A.	Kekule
B.	Le Bell and Van't Hoff
C.	Pauling
D.	Armstrong and Bayer
Answer» C. Pauling

Discussion

8368.	Osazone formation involves only 2 carbon atoms of glucose because of [MP PMT 1986]
A.	Chelation
B.	Oxidation
C.	Reduction
D.	Hydrolysis
Answer» C. Reduction

Discussion

8369.	Presence of \[Cr\] in steel makes it
A.	Resistant to chemical action
B.	Useful for making cutlery
C.	Increases chemical action
D.	a and b both
Answer» B. Useful for making cutlery

Discussion

8370.	The charge on colloidal particles is due to
A.	Presence of electrolyte
B.	Very small size of particles
C.	Adsorption of ions from the solution
D.	None of these
Answer» D. None of these

Discussion

8371.	Which is impure form of iron
A.	Cast iron
B.	Wrought iron
C.	Steel iron
D.	None
Answer» B. Wrought iron

Discussion

8372.	In the reaction: \[{{H}_{2}}S\] ⇄ \[2{{H}^{+}}+{{S}^{--}}\], when \[N{{H}_{4}}OH\] is added, then [KCET (Med.) 1999; AFMC 2000]
A.	\[{{S}^{--}}\] is precipitate
B.	No action takes places
C.	Concentration of \[{{S}^{--}}\] decreases
D.	Concentration of \[{{S}^{--}}\] increases
Answer» E.

Discussion

8373.	Visible range of hydrogen spectrum will contain the following series [RPET 2000]
A.	Pfund
B.	Lyman
C.	Balmer
D.	Brackett
Answer» D. Brackett

Discussion

8374.	Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\] [CBSE PMT 1990]
A.	\[N{{O}_{2}}\]
B.	\[{{N}_{2}}O\]
C.	\[NO\]
D.	\[{{N}_{2}}{{O}_{2}}\]
Answer» C. \[NO\]

Discussion

8375.	What is the % of \[{{H}_{2}}O\]in \[Fe{{(CNS)}_{3}}.3{{H}_{2}}O\]
A.	45
B.	30
C.	19
D.	25
Answer» D. 25

Discussion

8376.	?Delta? at the rivers are formed due to
A.	Peptization
B.	Coagulation
C.	Hydrolysis
D.	Precipitation
Answer» C. Hydrolysis

Discussion

8377.	The passivity of iron in concentrated nitric acid is due to [MP PMT 1994]
A.	Ferric nitrate coating on the metal
B.	Ammonium nitrate coating on the metal
C.	A thin oxide layer coating on the metal
D.	A hydride coating on the metal
Answer» D. A hydride coating on the metal

Discussion

8378.	Which compound will react with an aqueous solution of \[Ag(N{{H}_{3}})_{2}^{+}O{{H}^{-}}\] [DPMT 2000]
A.	\[C{{H}_{2}}=C{{H}_{2}}\]
B.	\[C{{H}_{3}}-C{{H}_{3}}\]
C.	\[C{{H}_{3}}C{{H}_{2}}C\equiv CH\]
D.	\[C{{H}_{3}}-C\equiv C-C{{H}_{3}}\]
Answer» D. \[C{{H}_{3}}-C\equiv C-C{{H}_{3}}\]

Discussion

8379.	The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is [Roorkee 1994]
A.	\[XY\]
B.	\[{{X}_{2}}Y\]
C.	\[X{{Y}_{3}}\]
D.	\[{{X}_{2}}{{Y}_{3}}\]
Answer» C. \[X{{Y}_{3}}\]

Discussion

8380.	\[AlC{{l}_{3}}\] is [AFMC 1995]
A.	Anhydrous and covalent
B.	Anhydrous and ionic
C.	Covalent and basic
D.	Coordinate and acidic
Answer» B. Anhydrous and ionic

Discussion

8381.	Wavelength of spectral line emitted is inversely proportional to [CPMT 2001]
A.	Radius
B.	Energy
C.	Velocity
D.	Quantum number
Answer» C. Velocity

Discussion

8382.	In the measurement of gold number, the useful electrolyte is
A.	\[AuC{{l}_{3}}\]
B.	\[NaCl\]
C.	\[AlC{{l}_{3}}\]
D.	\[FeC{{l}_{3}}\]
Answer» C. \[AlC{{l}_{3}}\]

Discussion

8383.	On hydrolysis, which produces only glucose [BVP 2004]
A.	Galactose
B.	Maltose
C.	Sucrose
D.	None
Answer» C. Sucrose

Discussion

8384.	In graphite C-atom is in ....state [CPMT 2002]
A.	\[s{{p}^{3}}\]
B.	\[sp\]
C.	\[s{{p}^{2}}\]
D.	None of these
Answer» D. None of these

Discussion

8385.	Aqueous solution of sodium acetate is [MNR 1978; CPMT 1971, 80, 81; MADT Bihar 1982; MP PMT 1985;]
A.	Neutral
B.	Weakly acidic
C.	Strongly acidic
D.	Alkaline
Answer» E.

Discussion

8386.	A petroleum fraction having boiling range 70-200°C and containing 6-10 carbon atoms per molecule is called [UPSEAT 2004]
A.	Natural gas
B.	Gas oil
C.	Gasoline
D.	Kerosene
Answer» B. Gas oil

Discussion

8387.	Aq. solution of sodium cyanide is [BHU 1981]
A.	Acidic
B.	Amphoteric
C.	Basic
D.	Netural
Answer» D. Netural

Discussion

8388.	A catalyst is a substance which [NCERT 1981; CPMT 1996]
A.	Alters the equilibrium in a reaction
B.	Is always in the same phase as the reactants
C.	Participates in the reaction and provides easier pathway for the same
D.	Does not participate in the reaction but speeds it up
Answer» E.

Discussion

8389.	If solubility of calcium hydroxide is \[\sqrt{3}\], then its solubility product will be [MH CET 2002]
A.	27
B.	3
C.	9
D.	\[12\sqrt{3}\]
Answer» E.

Discussion

8390.	Benzene was discovered by [NCERT 1981]
A.	Ramsay
B.	Dalton
C.	Faraday
D.	Priestley
Answer» D. Priestley

Discussion

8391.	The enthalpy of water is \[386\,kJ\]. What is entropy of water [BHU 1997]
A.	0.5 kJ
B.	1.03 kJ
C.	1.5 kJ
D.	22.05 kJ
Answer» C. 1.5 kJ

Discussion

8392.	Which of the following metal forms an amphoteric oxide [CPMT 1976]
A.	\[Ca\]
B.	\[Fe\]
C.	\[Cu\]
D.	\[Zn\]
Answer» E.

Discussion

8393.	Which of the following behaves as both Lewis and Bronsted base [MP PMT 2003]
A.	\[B{{F}_{3}}\]
B.	\[C{{l}^{-}}\]
C.	\[CO\]
D.	None of these
Answer» C. \[CO\]

Discussion

8394.	Ligand in a complex salt are [KCET 1992]
A.	Anions linked by coordinate bonds to a central metal atom or ion
B.	Cations linked by coordinate bonds to a central metal atom or ion
C.	Molecules linked by coordinate bonds to a central metal atom or ion
D.	Ions or molecules linked by coordinate bonds to a central metal atom or ion
Answer» E.

Discussion

8395.	A depolarizer used in dry cell batteries is [NCERT 1981]
A.	Ammonium chloride
B.	Manganese dioxide
C.	Potassium hydroxide
D.	Sodium phosphate
Answer» C. Potassium hydroxide

Discussion

8396.	Silver acetylide when heated with \[HCl\] gives
A.	\[{{C}_{2}}{{H}_{2}}\]
B.	\[{{H}_{2}}\]
C.	\[{{C}_{2}}{{H}_{4}}\]
D.	None of these
Answer» B. \[{{H}_{2}}\]

Discussion

8397.	Wilhem Ostwald redefined the action of [Kerala (Med.) 2002]
A.	Anamers
B.	Isomers
C.	Catalyst
D.	Geometry of monomers
Answer» D. Geometry of monomers

Discussion

8398.	In the equation \[{{H}_{2}}S+2HN{{O}_{3}}\to 2{{H}_{2}}O+2N{{O}_{2}}+S\] The equivalent weight of hydrogen sulphide is [BVP 2003]
A.	16
B.	68
C.	34
D.	17
Answer» E.

Discussion

8399.	Isomerism in saturated hydrocarbons is due to
A.	Change in the valence of carbon
B.	Change in the ratio of elements in compounds
C.	Formation of branches in the chain of C atoms
D.	Formation of double bond
Answer» D. Formation of double bond

Discussion

8400.	A heat engine absorbs heat \[{{Q}_{1}}\] at temperature \[{{T}_{1}}\] and heat \[{{Q}_{2}}\] at temperature \[{{T}_{2}}\]. Work done by the engine is \[({{Q}_{1}}+{{Q}_{2}})\]. This data [AIEEE 2002]
A.	Violates Ist law of thermodynamics
B.	Violates Ist law of thermodynamics if \[{{Q}_{1}}\] is ?ve
C.	Violates Ist law of thermodynamics if \[{{Q}_{2}}\] is ?ve
D.	Does not violate Ist law of thermodynamics
Answer» E.

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

The osmotic pressure of which solution is maximum (consider that deci-molar solution of each 90% dissociated) [MP PMT 2003]

The aqueous solution of which one of the following is basic [MP PMT 2001]

In a homogeneous catalysis

Ethylene is prepared by the dehydration of [CPMT 1974, 79; DPMT 1985; BHU 1989]

The law formulated by Dr. Nernst is [Kerala (Med.) 2002]

Which characteristic is true in respect of colloidal particle [CPMT 1993; UPSEAT 2000]

\[C{{H}_{2}}=CHCl\] reacts with HCl to form [CPMT 1985, 93]

Prussian blue is due to the formation of [BHU 1980; CBSE PMT 1990; KCET 1992; MP PET 1995]

Which of the following compound expected to be colourless

Lindane can be obtained by reaction of benzene with [DCE 2000]

Mixing of non-reacting gases is generally accompanied by

Six protons are found in the nucleus of [CPMT 1977, 80, 81; NCERT 1975, 78]

The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is [UPSEAT 2001]

The calorific values of fats, carbohydrates and proteins vary in the order

Electrolysis of cold concentrated aqueous solution of potassium succinate yields [CPMT 1985; MP PMT 1986]

\[pH\]of water is 7. When a substance \[Y\]is dissolved in water, the \[pH\]becomes 13. The substance \[Y\]is a salt of [MP PMT 1997]

The tetrahedral nature of carbon was first given by [MP PMT 1994]

Osazone formation involves only 2 carbon atoms of glucose because of [MP PMT 1986]

Presence of \[Cr\] in steel makes it

The charge on colloidal particles is due to

Which is impure form of iron

In the reaction: \[{{H}_{2}}S\] ⇄ \[2{{H}^{+}}+{{S}^{--}}\], when \[N{{H}_{4}}OH\] is added, then [KCET (Med.) 1999; AFMC 2000]

Visible range of hydrogen spectrum will contain the following series [RPET 2000]

Which of the following oxides of nitrogen is isoelectronic with \[C{{O}_{2}}\] [CBSE PMT 1990]

What is the % of \[{{H}_{2}}O\]in \[Fe{{(CNS)}_{3}}.3{{H}_{2}}O\]

?Delta? at the rivers are formed due to

The passivity of iron in concentrated nitric acid is due to [MP PMT 1994]

Which compound will react with an aqueous solution of \[Ag(N{{H}_{3}})_{2}^{+}O{{H}^{-}}\] [DPMT 2000]

The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is [Roorkee 1994]

\[AlC{{l}_{3}}\] is [AFMC 1995]

Wavelength of spectral line emitted is inversely proportional to [CPMT 2001]

In the measurement of gold number, the useful electrolyte is

On hydrolysis, which produces only glucose [BVP 2004]

In graphite C-atom is in ....state [CPMT 2002]

Aqueous solution of sodium acetate is [MNR 1978; CPMT 1971, 80, 81; MADT Bihar 1982; MP PMT 1985;]

A petroleum fraction having boiling range 70-200°C and containing 6-10 carbon atoms per molecule is called [UPSEAT 2004]

Aq. solution of sodium cyanide is [BHU 1981]

A catalyst is a substance which [NCERT 1981; CPMT 1996]

If solubility of calcium hydroxide is \[\sqrt{3}\], then its solubility product will be [MH CET 2002]

Benzene was discovered by [NCERT 1981]

The enthalpy of water is \[386\,kJ\]. What is entropy of water [BHU 1997]

Which of the following metal forms an amphoteric oxide [CPMT 1976]

Which of the following behaves as both Lewis and Bronsted base [MP PMT 2003]

Ligand in a complex salt are [KCET 1992]

A depolarizer used in dry cell batteries is [NCERT 1981]

Silver acetylide when heated with \[HCl\] gives

Wilhem Ostwald redefined the action of [Kerala (Med.) 2002]

In the equation \[{{H}_{2}}S+2HN{{O}_{3}}\to 2{{H}_{2}}O+2N{{O}_{2}}+S\] The equivalent weight of hydrogen sulphide is [BVP 2003]

Isomerism in saturated hydrocarbons is due to

A heat engine absorbs heat \[{{Q}_{1}}\] at temperature \[{{T}_{1}}\] and heat \[{{Q}_{2}}\] at temperature \[{{T}_{2}}\]. Work done by the engine is \[({{Q}_{1}}+{{Q}_{2}})\]. This data [AIEEE 2002]