11242 + Mcqs in Chemistry Page 150 McqOptions

7451.	A hydrocarbon of formula \[{{C}_{6}}{{H}_{10}}\] absorbs only one molecule of \[{{H}_{2}}\] upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yields \[\overset{H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{O=C-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}}}\,}}\,-\overset{\,\,\,\,H}{\mathop{\overset{\,\,\,\,\,\,\|}{\mathop{C{{H}_{2}}-C=O}}\,}}\,\] The hydrocarbon is [MP PMT 1986]
A.	Cyclohexane
B.	Benzene
C.	Cyclohexene
D.	Cyclobutane
Answer» D. Cyclobutane

Discussion

7452.	Saturated solution of \[KN{{O}_{3}}\] is used to make ?salt-bridge? because [IIT Screening 2002]
A.	Velocity of \[{{K}^{+}}\] is greater than that of \[NO_{3}^{-}\]
B.	Velocity of \[NO_{3}^{-}\] is greater than that of \[{{K}^{+}}\]
C.	Velocities of both \[{{K}^{+}}\]and \[NO_{3}^{-}\] are nearly the same
D.	\[KN{{O}_{3}}\]is highly soluble in water
Answer» D. \[KN{{O}_{3}}\]is highly soluble in water

Discussion

7453.	\[C{{H}_{3}}MgI\] will give methane with [Roorkee 1995]
A.	\[{{C}_{2}}{{H}_{5}}OH\]
B.	\[C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}\]
C.	\[C{{H}_{3}}-CO-C{{H}_{3}}\]
D.	All of these
Answer» B. \[C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}\]

Discussion

7454.	A gas decolourised by \[KMn{{O}_{4}}\] solution but gives no precipitate with ammoniacal cuprous chloride is [KCET 2005]
A.	Ethane
B.	Methane
C.	Ethene
D.	Acetylene
Answer» D. Acetylene

Discussion

7455.	In the metallurgy of zinc, flux is not used because
A.	Zinc ore has no impurities
B.	Zinc is volatile hence easily separated
C.	Zinc reacts with flux
D.	Flux is volatile
Answer» C. Zinc reacts with flux

Discussion

7456.	The homologue of ethyne is [EAMCET 1998]
A.	\[{{C}_{2}}{{H}_{4}}\]
B.	\[{{C}_{2}}{{H}_{6}}\]
C.	\[{{C}_{3}}{{H}_{8}}\]
D.	\[{{C}_{3}}{{H}_{4}}\]
Answer» E.

Discussion

7457.	Which of the following will occur if a 0.1 M solution of a weak acid is diluted to \[0.01\,M\] at constant temperature [UPSEAT 2001, 02]
A.	\[[{{H}^{+}}]\] will decrease to 0.01 M
B.	\[pH\] will decrease
C.	Percentage ionization will increase
D.	\[{{K}_{a}}\] will increase
Answer» C. Percentage ionization will increase

Discussion

7458.	Ethene when treated with \[B{{r}_{2}}\] in the presence of \[CC{{l}_{4}}\] which compound is formed [RPMT 1997; DCE 2001; KCET (Med.) 1999]
A.	1, 2-dibromoethane
B.	1-bromo-2-chloroethane
C.	Both A and B
D.	1, 1, 1-tribromoethane
Answer» B. 1-bromo-2-chloroethane

Discussion

7459.	Which of the following glass is used in making wind screen of automobiles [AIIMS 1999; Pb. CET 2000]
A.	Crook's
B.	Jena
C.	Safety
D.	Pyrex
Answer» D. Pyrex

Discussion

7460.	In silicon dioxide [AIEEE 2005]
A.	Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms
B.	Each siliocn atom is surrounded by two oxygen atoms and each oxygen atom is bounded to two silicon atoms
C.	Silicon atom is bonded to two oxygen atoms
D.	There are double bonds between silicon and oxygen atoms
Answer» B. Each siliocn atom is surrounded by two oxygen atoms and each oxygen atom is bounded to two silicon atoms

Discussion

7461.	Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on [MP PMT 1996]
A.	Buffer action
B.	Common ion effect
C.	Association of salt
D.	Hydrolysis of salt
Answer» C. Association of salt

Discussion

7462.	The movement of colloidal particles towards the oppositely charged electrodes on passing electricity is known as [AFMC 2000]
A.	Cataphoresis
B.	Tyndall effect
C.	Brownian movement
D.	None of these
Answer» B. Tyndall effect

Discussion

7463.	When a substance comes in colloidal state the surface area of the particles
A.	Increases
B.	Decreases
C.	Remains unchanged
D.	First increases then decreases
Answer» B. Decreases

Discussion

7464.	The radioisotope, tritium \[(_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg. How many milligrams of it would remain after 49.2 years [CBSE 2003]
A.	8 mg
B.	1 mg
C.	2 mg
D.	4 mg
Answer» D. 4 mg

Discussion

7465.	The ratio between the neutrons in \[C\] and \[Si\] with respect to atomic masses 12 and 28 is [EAMCET 1990]
A.	2 : 3
B.	3 : 2
C.	3 : 7
D.	7 : 3
Answer» D. 7 : 3

Discussion

7466.	The total entropy change for a system and its surroundings increases, if the process is
A.	Reversible
B.	Irreversible
C.	Exothermic
D.	Endothermic
Answer» E.

Discussion

7467.	Which one will give \[F{{e}^{3+}}\] ions in solution
A.	\[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}\]
B.	\[F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\]
C.	\[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]
D.	\[N{{H}_{4}}{{(S{{O}_{4}})}_{2}}.FeS{{O}_{4}}.6{{H}_{2}}O\]
Answer» C. \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]

Discussion

7468.	A group of acidic oxide is [MP PET 2003]
A.	\[Cr{{O}_{3}},\,\,M{{n}_{2}}{{O}_{7}}\]
B.	\[ZnO,\,\,A{{l}_{2}}{{O}_{3}}\]
C.	\[CaO,\,\,ZnO\]
D.	\[N{{a}_{2}}O,\,\,A{{l}_{2}}{{O}_{3}}\]
Answer» B. \[ZnO,\,\,A{{l}_{2}}{{O}_{3}}\]

Discussion

7469.	Stainless steel is an alloy of [AFMC 2004]
A.	Copper
B.	Nickel and chromium
C.	Manganese
D.	Zinc
Answer» C. Manganese

Discussion

7470.	The alkene \[{{C}_{6}}{{H}_{10}}\] producing \[OHC-{{(C{{H}_{2}})}_{4}}-CHO\] on ozonolysis is [Roorkee 1999]
A.	Hexene-1
B.	Hexene-3
C.	Cyclohexene
D.	1-methylcyclohexene-1
Answer» D. 1-methylcyclohexene-1

Discussion

7471.	Carbohydrates are [MADT Bihar 1983]
A.	Hydrates of carbon
B.	Polyhydroxy aldehydes or ketones
C.	Polyhydroxy acid compounds
D.	None of these
Answer» C. Polyhydroxy acid compounds

Discussion

7472.	Wood charcoal is used to decolourise sugar because it [CPMT 2002]
A.	Adsorbs coloured material
B.	Absorbs decolorised material
C.	Reduces coloured material
D.	None of these
Answer» B. Absorbs decolorised material

Discussion

7473.	Adam's catalyst is [Pb.CET 2001]
A.	Platinum
B.	Iron
C.	Molybdenum
D.	Nickel
Answer» B. Iron

Discussion

7474.	Wavelength associated with electron motion [BHU 1998]
A.	Increases with increase in speed of electron
B.	Remains same irrespective of speed of electron
C.	Decreases with increase in speed of \[{{e}^{-}}\]
D.	Is zero
Answer» D. Is zero

Discussion

7475.	A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is ? 2, the possible formula of the compound is [CBSE PMT 2000]
A.	\[{{A}_{3}}{{(B{{C}_{4}})}_{2}}\]
B.	\[{{A}_{3}}{{({{B}_{4}}C)}_{2}}\]
C.	\[AB{{C}_{2}}\]
D.	\[{{A}_{2}}{{(B{{C}_{3}})}_{2}}\]
Answer» B. \[{{A}_{3}}{{({{B}_{4}}C)}_{2}}\]

Discussion

7476.	If in a container neither mass and nor heat exchange occurs then it constitutes a [MP PMT 1993; AFMC 2003]
A.	Closed system
B.	Open system
C.	Isolated system
D.	Imaginary system
Answer» D. Imaginary system

Discussion

7477.	Blood may be purified by [MP PMT 2000]
A.	Dialysis
B.	Electro-osmosis
C.	Coagulation
D.	Filtration
Answer» B. Electro-osmosis

Discussion

7478.	Silver iodide is used for producing artificial rain because \[AgI\] [NCERT 1984]
A.	Is easy to spray at high altitudes
B.	Is easy to synthesize
C.	Has crystal structure similar to ice
D.	Is insoluble in water
Answer» D. Is insoluble in water

Discussion

7479.	The metal used for making radiation shield is [Kerala (Med.) 2002]
A.	Aluminium
B.	Iron
C.	Zinc
D.	Lead
Answer» E.

Discussion

7480.	If W is atomic weight and N is the atomic number of an element, then [CPMT 1971, 80, 89]
A.	Number of \[{{e}^{-1}}=W-N\]
B.	Number of \[_{0}{{n}^{1}}=W-N\]
C.	Number of \[_{1}{{H}^{1}}=W-N\]
D.	Number of \[_{0}{{n}^{1}}=N\]
Answer» C. Number of \[_{1}{{H}^{1}}=W-N\]

Discussion

7481.	The product of reaction between propene and HBr in the presence of a peroxide is
A.	\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}Br\]
B.	\[C{{H}_{3}}-CHBr-C{{H}_{3}}\]
C.	\[C{{H}_{3}}-C{{H}_{2}}Br\]
D.	\[C{{H}_{3}}-CH=CHBr\]
Answer» B. \[C{{H}_{3}}-CHBr-C{{H}_{3}}\]

Discussion

7482.	Mark the correct statement [MP PET 1997]
A.	For a chemical reaction to be feasible, \[\Delta G\] should be zero
B.	Entropy is a measure of order in a system
C.	For a chemical reaction to be feasible, \[\Delta G\] should be positive
D.	The total energy of an isolated system is constant
Answer» E.

Discussion

7483.	The specific conductance of a 0.1 N KCl solution at \[{{23}^{o}}C\] is \[0.012\,oh{{m}^{-1\,}}c{{m}^{-1}}\]. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be [CBSE PMT 1999, 2000; KCET 2001]
A.	\[0.142\,c{{m}^{-1}}\]
B.	\[0.66\,c{{m}^{-1}}\]
C.	\[0.918\,c{{m}^{-1}}\]
D.	\[1.12\,c{{m}^{-1}}\]
Answer» C. \[0.918\,c{{m}^{-1}}\]

Discussion

7484.	According to Bronsted law, water is a/an [MP PET/PMT 1988]
A.	Base
B.	Acid
C.	Acid and base both
D.	Salt
Answer» D. Salt

Discussion

7485.	Which one of the following in used to make 'non-stick' cookware [CBSE PMT 1997; AIIMS 1998]
A.	PVC
B.	Polystyrene
C.	Polyethylene terephthalate
D.	Polytetrafluoroethylene
Answer» E.

Discussion

7486.	If \[{{N}_{A}}\]is Avogadro?s number then number of valence electrons in 4.2 g of nitride ions \[({{N}^{3-}})\]
A.	2.4 \[{{N}_{A}}\]
B.	4.2 \[{{N}_{A}}\]
C.	\[1.6\,{{N}_{A}}\]
D.	\[3.2\,{{N}_{A}}\]
Answer» B. 4.2 \[{{N}_{A}}\]

Discussion

7487.	Which one of the following statements is correct [AIEEE 2003]
A.	Manganese salts give violet borax bead test in the reducing flame
B.	From a mixed precipitate of \[AgCl\] and \[AgI\] ammonia solution dissolves only \[AgCl\]
C.	Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
D.	On boiling a solution having \[{{K}^{+}},\,C{{a}^{2+}}\] and \[HCO_{3}^{-}\] ions we get a precipitate of \[{{K}_{2}}Ca{{(C{{O}_{3}})}_{2}}\]
Answer» C. Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution

Discussion

7488.	Product obtained after nitration of nitrobenzene is [RPMT 1997]
A.	TNT
B.	1, 3-dinitrobenzene
C.	Picric acid
D.	1, 4-dinitrobenzene
Answer» C. Picric acid

Discussion

7489.	When \[KMn{{O}_{4}}\] reacts with acidified \[FeS{{O}_{4}}\] [MP PET 1996]
A.	Only \[FeS{{O}_{4}}\] is oxidised
B.	Only \[KMn{{O}_{4}}\] is oxidised
C.	\[FeS{{O}_{4}}\] is oxidised \[KMn{{O}_{4}}\] and is reduced
D.	None of these
Answer» D. None of these

Discussion

7490.	Shellac contains mainly
A.	Cellulose
B.	Polyhydroxy organic acids
C.	Polyamides
D.	Polyesters
Answer» C. Polyamides

Discussion

7491.	Iron when treated with concentrated nitric acid [MP PET 1996]
A.	Readily reacts
B.	Slowly reacts
C.	Becomes passive
D.	Gives ferrous nitrate
Answer» D. Gives ferrous nitrate

Discussion

7492.	The number of \[s{{p}^{3}}\] hybridized carbon atoms in cyclohexene are [MP PMT 1997]
A.	2
B.	3
C.	4
D.	6
Answer» D. 6

Discussion

7493.	Bohr model of an atom could not account for
A.	Emission spectrum
B.	Absorption spectrum
C.	Line spectrum of hydrogen
D.	Fine spectrum
Answer» E.

Discussion

7494.	Photographic films and plates have an essential ingredient of [CPMT 1980; CBSE PMT 1989]
A.	Silver nitrate
B.	Silver bromide
C.	Sodium chloride
D.	Oleic acid
Answer» C. Sodium chloride

Discussion

7495.	Ethyl alcohol on heating with conc. \[{{H}_{2}}S{{O}_{4}}\] gives [EAMCET 1979; MP PMT 1996]
A.	\[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]
B.	\[{{C}_{2}}{{H}_{6}}\]
C.	\[{{C}_{2}}{{H}_{4}}\]
D.	\[{{C}_{2}}{{H}_{2}}\]
Answer» D. \[{{C}_{2}}{{H}_{2}}\]

Discussion

7496.	A liquid aerosol is a colloidal system of [MP PMT 1987]
A.	A liquid dispersed in a solid
B.	A liquid dispersed in a gas
C.	A gas dispersed in a liquid
D.	A solid dispersed in a gas
Answer» C. A gas dispersed in a liquid

Discussion

7497.	Which of the following is formed when aluminium oxide and carbon is strongly heated in dry chlorine gas [AFMC 2000]
A.	Aluminium chloride
B.	Hydrate aluminium chloride
C.	Anhydrous aluminium chloride
D.	None of these
Answer» D. None of these

Discussion

7498.	Activation energy is given by the formula [DCE 1999]
A.	\[\log \frac{{{K}_{2}}}{{{K}_{1}}}=\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\]
B.	\[\log \frac{{{K}_{1}}}{{{K}_{2}}}=-\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\]
C.	\[\log \frac{{{K}_{1}}}{{{K}_{2}}}=-\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}{{T}_{2}}} \right]\]
D.	None of these
Answer» B. \[\log \frac{{{K}_{1}}}{{{K}_{2}}}=-\frac{{{E}_{a}}}{2.303R}\left[ \frac{{{T}_{2}}-{{T}_{1}}}{{{T}_{1}}{{T}_{2}}} \right]\]

Discussion

7499.	Which one among the following is a thermosetting plastic? [MP PMT 1993, 95; AIIMS 1999]
A.	PVC
B.	PVA
C.	Bakelite
D.	Perspex
Answer» D. Perspex

Discussion

7500.	Pick out the isoelectronic structures from the following \[\underset{\text{I}}{\mathop{CH_{3}^{+}}}\,\] \[\underset{\text{II}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,\] \[\underset{\text{III}}{\mathop{N{{H}_{3}}}}\,\] \[\underset{\text{IV}}{\mathop{CH_{3}^{-}}}\,\] [IIT 1993]
A.	I and II
B.	I and IV
C.	I and III
D.	II, III and IV
Answer» E.

Discussion

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

Saturated solution of \[KN{{O}_{3}}\] is used to make ?salt-bridge? because [IIT Screening 2002]

\[C{{H}_{3}}MgI\] will give methane with [Roorkee 1995]

A gas decolourised by \[KMn{{O}_{4}}\] solution but gives no precipitate with ammoniacal cuprous chloride is [KCET 2005]

In the metallurgy of zinc, flux is not used because

The homologue of ethyne is [EAMCET 1998]

Which of the following will occur if a 0.1 M solution of a weak acid is diluted to \[0.01\,M\] at constant temperature [UPSEAT 2001, 02]

Ethene when treated with \[B{{r}_{2}}\] in the presence of \[CC{{l}_{4}}\] which compound is formed [RPMT 1997; DCE 2001; KCET (Med.) 1999]

Which of the following glass is used in making wind screen of automobiles [AIIMS 1999; Pb. CET 2000]

In silicon dioxide [AIEEE 2005]

Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on [MP PMT 1996]

The movement of colloidal particles towards the oppositely charged electrodes on passing electricity is known as [AFMC 2000]

When a substance comes in colloidal state the surface area of the particles

The radioisotope, tritium \[(_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg. How many milligrams of it would remain after 49.2 years [CBSE 2003]

The ratio between the neutrons in \[C\] and \[Si\] with respect to atomic masses 12 and 28 is [EAMCET 1990]

The total entropy change for a system and its surroundings increases, if the process is

Which one will give \[F{{e}^{3+}}\] ions in solution

A group of acidic oxide is [MP PET 2003]

Stainless steel is an alloy of [AFMC 2004]

The alkene \[{{C}_{6}}{{H}_{10}}\] producing \[OHC-{{(C{{H}_{2}})}_{4}}-CHO\] on ozonolysis is [Roorkee 1999]

Carbohydrates are [MADT Bihar 1983]

Wood charcoal is used to decolourise sugar because it [CPMT 2002]

Adam's catalyst is [Pb.CET 2001]

Wavelength associated with electron motion [BHU 1998]

A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is ? 2, the possible formula of the compound is [CBSE PMT 2000]

If in a container neither mass and nor heat exchange occurs then it constitutes a [MP PMT 1993; AFMC 2003]

Blood may be purified by [MP PMT 2000]

Silver iodide is used for producing artificial rain because \[AgI\] [NCERT 1984]

The metal used for making radiation shield is [Kerala (Med.) 2002]

If W is atomic weight and N is the atomic number of an element, then [CPMT 1971, 80, 89]

The product of reaction between propene and HBr in the presence of a peroxide is

Mark the correct statement [MP PET 1997]

The specific conductance of a 0.1 N KCl solution at \[{{23}^{o}}C\] is \[0.012\,oh{{m}^{-1\,}}c{{m}^{-1}}\]. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be [CBSE PMT 1999, 2000; KCET 2001]

According to Bronsted law, water is a/an [MP PET/PMT 1988]

Which one of the following in used to make 'non-stick' cookware [CBSE PMT 1997; AIIMS 1998]

If \[{{N}_{A}}\]is Avogadro?s number then number of valence electrons in 4.2 g of nitride ions \[({{N}^{3-}})\]

Which one of the following statements is correct [AIEEE 2003]

Product obtained after nitration of nitrobenzene is [RPMT 1997]

When \[KMn{{O}_{4}}\] reacts with acidified \[FeS{{O}_{4}}\] [MP PET 1996]

Shellac contains mainly

Iron when treated with concentrated nitric acid [MP PET 1996]

The number of \[s{{p}^{3}}\] hybridized carbon atoms in cyclohexene are [MP PMT 1997]

Bohr model of an atom could not account for

Photographic films and plates have an essential ingredient of [CPMT 1980; CBSE PMT 1989]

Ethyl alcohol on heating with conc. \[{{H}_{2}}S{{O}_{4}}\] gives [EAMCET 1979; MP PMT 1996]

A liquid aerosol is a colloidal system of [MP PMT 1987]

Which of the following is formed when aluminium oxide and carbon is strongly heated in dry chlorine gas [AFMC 2000]

Activation energy is given by the formula [DCE 1999]

Which one among the following is a thermosetting plastic? [MP PMT 1993, 95; AIIMS 1999]

Pick out the isoelectronic structures from the following \[\underset{\text{I}}{\mathop{CH_{3}^{+}}}\,\] \[\underset{\text{II}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,\] \[\underset{\text{III}}{\mathop{N{{H}_{3}}}}\,\] \[\underset{\text{IV}}{\mathop{CH_{3}^{-}}}\,\] [IIT 1993]