11242 + Mcqs in Chemistry Page 172 McqOptions

8551.	In laboratory silicon can be prepared by the reaction [Pb. PMT 1999; AFMC 2002]
A.	Silica with magnesium
B.	By heating carbon in electric furnace
C.	By heating potassium fluosilicate with potassium
D.	None of these
Answer» B. By heating carbon in electric furnace

Discussion

8552.	Which one of the following statements is incorrect in the case of heterogeneous catalysis [CPMT 1990]
A.	The catalyst lowers the energy of activation
B.	The catalyst actually forms a compound with the reactant
C.	The surface of the catalyst plays a very important role
D.	There is no change in the energy of activation
Answer» E.

Discussion

8553.	Rust is [Pb. CET 2004]
A.	\[FeO+Fe{{(OH)}_{2}}\]
B.	\[F{{e}_{2}}{{O}_{3}}\]
C.	\[F{{e}_{2}}{{O}_{3}}+Fe{{(OH)}_{2}}\]
D.	\[F{{e}_{2}}{{O}_{3}}\] and \[Fe{{(OH)}_{3}}\]
Answer» D. \[F{{e}_{2}}{{O}_{3}}\] and \[Fe{{(OH)}_{3}}\]

Discussion

8554.	The activation energy for a simple chemical reaction \[A\to B\] is \[{{E}_{a}}\] in forward direction. The activation energy for reverse reaction [CBSE PMT 2003]
A.	Is always double of \[{{E}_{a}}\]
B.	Is negative of \[{{E}_{a}}\]
C.	Is always less than \[{{E}_{a}}\]
D.	Can be less than or more than \[{{E}_{a}}\]
Answer» E.

Discussion

8555.	If isobutane and n-butane are present in a gas, then how much oxygen should be required for complete combustion of 5 kg of this gas
A.	17.9 kg
B.	9 kg
C.	27 kg
D.	1.8 kg
Answer» B. 9 kg

Discussion

8556.	The number of electrons in \[C{{l}^{-}}\] ion is [MP PMT 2003]
A.	19
B.	20
C.	18
D.	35
Answer» D. 35

Discussion

8557.	What is the use of tetraethyl lead
A.	As a catalyst in addition reaction of alkenes
B.	As a catalyst in polymerization reaction of alkenes
C.	For reducing knocking
D.	For creating knocking
Answer» D. For creating knocking

Discussion

8558.	It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium sugars undergo one of the following changes [AIIMS 1982]
A.	Racemisation
B.	Decomposition
C.	Inversion
D.	Rearrangement
Answer» D. Rearrangement

Discussion

8559.	A gas decolourises bromine in \[CC{{l}_{4}}\] and forms a precipitate with ammoniacal silver nitrate. The gas is [EAMCET 1998]
A.	\[{{C}_{2}}{{H}_{2}}\]
B.	\[{{C}_{2}}{{H}_{4}}\]
C.	\[{{C}_{2}}{{H}_{6}}\]
D.	\[C{{H}_{4}}\]
Answer» B. \[{{C}_{2}}{{H}_{4}}\]

Discussion

8560.	Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is
A.	4
B.	6
C.	2
D.	3
Answer» B. 6

Discussion

8561.	A catalyst is a substance which [Pb. CET 2004]
A.	Is always in the same phase as in the reactions
B.	Alters the equilibrium in a reaction
C.	Does not participate in the reaction but alters the rate of reaction
D.	Participates in the reaction and provide an easier pathway for the same
Answer» D. Participates in the reaction and provide an easier pathway for the same

Discussion

8562.	Lyophilic sols are [IIT 2005]
A.	Irreversible sols
B.	They are prepared from inorganic compound
C.	Coagulated by adding electrolytes
D.	Self-stabilizing
Answer» E.

Discussion

8563.	What is the magnetic moment of \[{{[Fe{{F}_{6}}]}^{3-}}\] [JEE Orissa 2004]
A.	5.92
B.	5.49
C.	2.32
D.	4
Answer» B. 5.49

Discussion

8564.	Strongest conjugate base is [DPMT 2004]
A.	\[C{{l}^{-}}\]
B.	\[B{{r}^{-}}\]
C.	\[{{F}^{-}}\]
D.	\[{{I}^{-}}\]
Answer» D. \[{{I}^{-}}\]

Discussion

8565.	Galactose is converted into glucose in [AFMC 1998]
A.	Mouth
B.	Stomach
C.	Liver
D.	Intestine
Answer» D. Intestine

Discussion

8566.	Aqueous solution of ferric chloride is [MP PMT 1999]
A.	Acidic
B.	Basic
C.	Neutral
D.	Amphoteric
Answer» B. Basic

Discussion

8567.	The halogen which is most reactive in the halogenation of alkenes under sunlight is [IIT-JEE 1981]
A.	Chlorine
B.	Bromine
C.	Iodine
D.	All equal
Answer» B. Bromine

Discussion

8568.	Which of the following sulphides has the lowest solubility product [KCET 1996]
A.	\[FeS\]
B.	\[MnS\]
C.	\[PbS\]
D.	\[ZnS\]
Answer» D. \[ZnS\]

Discussion

8569.	A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives [NCERT 1990]
A.	1-propene
B.	2-propene
C.	Isopropylene
D.	All the three
Answer» B. 2-propene

Discussion

8570.	Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn Blue [MP PET 2002]
A.	\[KN{{O}_{3}}\]
B.	\[AgN{{O}_{3}}\]
C.	\[Zn{{(N{{O}_{3}})}_{2}}\]
D.	\[ZnS{{O}_{4}}\]
Answer» C. \[Zn{{(N{{O}_{3}})}_{2}}\]

Discussion

8571.	The ultimate product of the hydrolysis of starch is [DPMT 2001]
A.	Fructose
B.	Glucose
C.	Sucrose
D.	None of these
Answer» C. Sucrose

Discussion

8572.	Which is least effective for artificial transmutation [DPMT 2000]
A.	Deuterons
B.	Neutrons
C.	a-particles
D.	Protons
Answer» D. Protons

Discussion

8573.	\[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be [MP PMT 1995]
A.	Carbon dioxide
B.	Carbon monoxide
C.	Oxygen
D.	Sulphur dioxide
Answer» B. Carbon monoxide

Discussion

8574.	When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces [AFMC 1999]
A.	Lewisite
B.	b-chlorovinyl dichloroarisine
C.	Nitrobenzene
D.	Both A and B
Answer» E.

Discussion

8575.	A substance used as a moderator in nuclear reactors is [MP PET 1995]
A.	Cadmium
B.	Uranium-235
C.	Lead
D.	Heavy water
Answer» E.

Discussion

8576.	Decreasing order of C-C bond length is [JEE Orissa 2004] \[{{C}_{2}}{{H}_{4}}\] \[{{C}_{2}}{{H}_{2}}\] \[{{C}_{6}}{{H}_{6}}\] \[{{C}_{2}}{{H}_{6}}\]
A.	IV > III > I > II
B.	I > II > IV > III
C.	II > I > IV > III
D.	IV > I > III > II
Answer» B. I > II > IV > III

Discussion

8577.	When \[\beta \]-particles are sent through a tin metal foil, most of them go straight through the foil as [EAMCET 1983]
A.	\[\beta \]-particles are much heavier than electrons
B.	\[\beta \]-particles are positively charged
C.	Most part of the atom is empty space
D.	\[\beta \]-particles move with high velocity
Answer» D. \[\beta \]-particles move with high velocity

Discussion

8578.	The strength of an acid depends on its tendency to [UPSEAT 2001]
A.	Accept protons
B.	Donate protons
C.	Accept electrons
D.	Donate electrons
Answer» C. Accept electrons

Discussion

8579.	In thermodynamics which one of the following is not an intensive property [Kerala (Med.) 2002]
A.	Pressure
B.	Density
C.	Volume
D.	Temperature
Answer» D. Temperature

Discussion

8580.	A carbon-carbon triple bond in ethyne \[(-C\equiv C-)\] consists of [AMU 2000]
A.	All \[\sigma \] bonds
B.	Two \[\sigma \] bonds and one \[\pi \]-bond
C.	One \[\sigma \] bond and two \[\pi \]bonds
D.	All \[\pi \] bonds
Answer» D. All \[\pi \] bonds

Discussion

8581.	One mole of each of the following alkenes is catalytically hydrogenated. The quantity of heat evolved will be the lowest in the case of [Roorkee 2000]
A.	1-butene
B.	Trans-2-butene
C.	Cis-2-butene
D.	1, 3-butadiene
Answer» E.

Discussion

8582.	Emery consists of [AFMC 1999]
A.	Impure corundum
B.	Impure carborundum
C.	Impure graphite
D.	Purest form of iron
Answer» B. Impure carborundum

Discussion

8583.	Blood contains
A.	Positively charged particles
B.	Negatively charged particles
C.	Neutral particles
D.	Negatively as well as positively charged particles
Answer» C. Neutral particles

Discussion

8584.	Conductivity of a solution is directly proportional to [KCET 1984]
A.	Dilution
B.	Number of ions
C.	Current density
D.	Volume of the solution
Answer» C. Current density

Discussion

8585.	In the reaction \[\begin{matrix} Br \\ H \\ \end{matrix}>\underset{1}{\mathop{C}}\,=\underset{2}{\mathop{C}}\,
A.	1 and 2 \[s{{p}^{2}};\] 3 and 4 \[s{{p}^{3}}\]
B.	1 and 2 \[s{{p}^{2}};\] 3 and 4 \[sp\]
C.	1, 2, 3 and 4 \[sp\]
D.	1, 2 \[s{{p}^{3}};\] 3, 4 \[s{{p}^{2}}\]
Answer» B. 1 and 2 \[s{{p}^{2}};\] 3 and 4 \[sp\]

Discussion

8586.	\[_{13}^{27}Al\] is a stable isotope. \[_{13}^{29}Al\] is expected to disintegrate by [IIT 1996; UPSEAT 2001]
A.	\[\alpha \]-emission
B.	\[\beta \]-emission
C.	Positron emission
D.	Proton emission
Answer» C. Positron emission

Discussion

8587.	The radioactivity isotope \[_{27}^{60}Co\] which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is [CBSE PMT 2004]
A.	\[_{28}^{60}Ni\]
B.	\[_{27}^{60}Co\]
C.	\[_{28}^{59}Ni\]
D.	\[_{27}^{59}Co\]
Answer» B. \[_{27}^{60}Co\]

Discussion

8588.	If the concentration of lead iodide in its saturated solution at \[{{25}^{o}}C\]be \[2\times {{10}^{-3}}\]moles per litre, then its solubility product is [CPMT 1984]
A.	\[4\times {{10}^{-6}}\]
B.	\[8\times {{10}^{-12}}\]
C.	\[6\times {{10}^{-9}}\]
D.	\[32\times {{10}^{-9}}\]
Answer» E.

Discussion

8589.	A process used for the concentration of ore is [MP PMT 1990; MP PET 2003]
A.	Froth floatation
B.	Roasting
C.	Electrolysis
D.	Bessemerization
Answer» B. Roasting

Discussion

8590.	A container has hydrogen and oxygen mixture in ratio of 4 : 1 by weight, then [BHU 1998]
A.	Internal energy of the mixture decreases
B.	Internal energy of the mixture increases
C.	Entropy of the mixture increases
D.	Entropy of the mixture decreases
Answer» D. Entropy of the mixture decreases

Discussion

8591.	\[N{{H}_{4}}OH\] is weak base because [CPMT 1979]
A.	It has low vapour pressure
B.	It is only slightly ionized
C.	It is not a hydroxide of metal
D.	It has low density
Answer» C. It is not a hydroxide of metal

Discussion

8592.	On heating glucose with Fehling's solution we get a precipitate whose colour is [CPMT 1979; CBSE PMT 1988; KCET 1992; DPMT 1983, 86; MP PMT 1996]
A.	Yellow
B.	Red
C.	Black
D.	White
Answer» C. Black

Discussion

8593.	Which will undergo reaction with ammoniacal \[AgN{{O}_{3}}\] [DPMT 1996]
A.	\[\begin{matrix} C{{H}_{3}} \\ C{{H}_{3}} \\ \end{matrix}>CH-C{{H}_{2}}-CH=CH-C{{H}_{3}}\]
B.	\[C{{H}_{3}}-CH=CH-C\equiv CH\]
C.	\[C{{H}_{3}}-C{{H}_{2}}-CH=CH-C{{H}_{2}}-C{{H}_{3}}\]
D.	\[C{{H}_{2}}=CH-C{{H}_{2}}-C{{H}_{3}}\]
E.	None
Answer» C. \[C{{H}_{3}}-C{{H}_{2}}-CH=CH-C{{H}_{2}}-C{{H}_{3}}\]

Discussion

8594.	Ethylene may be obtained by dehydration of which of the following with concentrated \[{{H}_{2}}S{{O}_{4}}\] at \[160-{{170}^{o}}C\] [RPET 1999]
A.	\[{{C}_{2}}{{H}_{5}}OH\]
B.	\[C{{H}_{3}}OH\]
C.	\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\]
D.	\[{{(C{{H}_{3}})}_{2}}CHC{{H}_{2}}OH\]
Answer» B. \[C{{H}_{3}}OH\]

Discussion

8595.	Which process of purification is represented by the following scheme\[\underset{\text{impure}}{\mathop{Ti}}\,+2{{I}_{2}}\xrightarrow{{{250}^{o}}C}Ti{{I}_{4}}\xrightarrow{{{1400}^{o}}C}\underset{\text{pure}}{\mathop{Ti}}\,+{{I}_{2}}\] [Kerala PMT 2004]
A.	Cupellation
B.	Poling
C.	Electrolytic refining
D.	Zone refining
E.	Van-Arkel process
Answer» F.

Discussion

8596.	When acetylene is passed into dilute sulphuric acid containing \[H{{g}^{2+}}\] ions, the product formed is [DPMT 1996; Roorkee 1995; BHU 1998; KCET 1999; MP PET 1985, 86; DCE 1999; DPMT 1999, 2002; CPMT 1975, 82, 83, 90; MP PMT 1994, 97; CBSE PMT 1999; AIIMS 2002; CBSE PMT 1999; KCET (Med.) 1999, JIPMER 1999]
A.	Acetone
B.	Acetic acid
C.	Acetaldehyde
D.	Formaldehyde
Answer» D. Formaldehyde

Discussion

8597.	Which of the following shows only one brominated compound [CPMT 1996]
A.	Butene-2
B.	2, 2-dimethylpropane
C.	Butyne-1
D.	Butanol-3
Answer» C. Butyne-1

Discussion

8598.	The aqueous solution of disodium hydrogen phosphate is [MADT Bihar 1982]
A.	Acidic
B.	Neutral
C.	Basic
D.	None
Answer» D. None

Discussion

8599.	Among them intensive property is [AFMC 2004]
A.	Mass
B.	Volume
C.	Surface tension
D.	Enthalpy
Answer» D. Enthalpy

Discussion

8600.	In the Thorium series, \[_{90}Th{{}^{232}}\] loses total of 6 a-particles and 4 b-particles in ten stages. The final isotope produced in the series is [MP PET 2001]
A.	\[_{82}P{{b}^{209}}\]
B.	\[_{83}B{{i}^{209}}\]
C.	\[_{82}P{{b}^{208}}\]
D.	\[_{82}P{{b}^{206}}\]
Answer» D. \[_{82}P{{b}^{206}}\]

Discussion

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

In laboratory silicon can be prepared by the reaction [Pb. PMT 1999; AFMC 2002]

Which one of the following statements is incorrect in the case of heterogeneous catalysis [CPMT 1990]

Rust is [Pb. CET 2004]

The activation energy for a simple chemical reaction \[A\to B\] is \[{{E}_{a}}\] in forward direction. The activation energy for reverse reaction [CBSE PMT 2003]

If isobutane and n-butane are present in a gas, then how much oxygen should be required for complete combustion of 5 kg of this gas

The number of electrons in \[C{{l}^{-}}\] ion is [MP PMT 2003]

What is the use of tetraethyl lead

It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium sugars undergo one of the following changes [AIIMS 1982]

A gas decolourises bromine in \[CC{{l}_{4}}\] and forms a precipitate with ammoniacal silver nitrate. The gas is [EAMCET 1998]

Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is

A catalyst is a substance which [Pb. CET 2004]

Lyophilic sols are [IIT 2005]

What is the magnetic moment of \[{{[Fe{{F}_{6}}]}^{3-}}\] [JEE Orissa 2004]

Strongest conjugate base is [DPMT 2004]

Galactose is converted into glucose in [AFMC 1998]

Aqueous solution of ferric chloride is [MP PMT 1999]

The halogen which is most reactive in the halogenation of alkenes under sunlight is [IIT-JEE 1981]

Which of the following sulphides has the lowest solubility product [KCET 1996]

A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives [NCERT 1990]

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn Blue [MP PET 2002]

The ultimate product of the hydrolysis of starch is [DPMT 2001]

Which is least effective for artificial transmutation [DPMT 2000]

\[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be [MP PMT 1995]

When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces [AFMC 1999]

A substance used as a moderator in nuclear reactors is [MP PET 1995]

Decreasing order of C-C bond length is [JEE Orissa 2004] \[{{C}_{2}}{{H}_{4}}\] \[{{C}_{2}}{{H}_{2}}\] \[{{C}_{6}}{{H}_{6}}\] \[{{C}_{2}}{{H}_{6}}\]

When \[\beta \]-particles are sent through a tin metal foil, most of them go straight through the foil as [EAMCET 1983]

The strength of an acid depends on its tendency to [UPSEAT 2001]

In thermodynamics which one of the following is not an intensive property [Kerala (Med.) 2002]

A carbon-carbon triple bond in ethyne \[(-C\equiv C-)\] consists of [AMU 2000]

One mole of each of the following alkenes is catalytically hydrogenated. The quantity of heat evolved will be the lowest in the case of [Roorkee 2000]

Emery consists of [AFMC 1999]

Blood contains

Conductivity of a solution is directly proportional to [KCET 1984]

In the reaction \[\begin{matrix} Br \\ H \\ \end{matrix}>\underset{1}{\mathop{C}}\,=\underset{2}{\mathop{C}}\,

\[_{13}^{27}Al\] is a stable isotope. \[_{13}^{29}Al\] is expected to disintegrate by [IIT 1996; UPSEAT 2001]

The radioactivity isotope \[_{27}^{60}Co\] which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is [CBSE PMT 2004]

If the concentration of lead iodide in its saturated solution at \[{{25}^{o}}C\]be \[2\times {{10}^{-3}}\]moles per litre, then its solubility product is [CPMT 1984]

A process used for the concentration of ore is [MP PMT 1990; MP PET 2003]

A container has hydrogen and oxygen mixture in ratio of 4 : 1 by weight, then [BHU 1998]

\[N{{H}_{4}}OH\] is weak base because [CPMT 1979]

On heating glucose with Fehling's solution we get a precipitate whose colour is [CPMT 1979; CBSE PMT 1988; KCET 1992; DPMT 1983, 86; MP PMT 1996]

Which will undergo reaction with ammoniacal \[AgN{{O}_{3}}\] [DPMT 1996]

Ethylene may be obtained by dehydration of which of the following with concentrated \[{{H}_{2}}S{{O}_{4}}\] at \[160-{{170}^{o}}C\] [RPET 1999]

Which process of purification is represented by the following scheme\[\underset{\text{impure}}{\mathop{Ti}}\,+2{{I}_{2}}\xrightarrow{{{250}^{o}}C}Ti{{I}_{4}}\xrightarrow{{{1400}^{o}}C}\underset{\text{pure}}{\mathop{Ti}}\,+{{I}_{2}}\] [Kerala PMT 2004]

Which of the following shows only one brominated compound [CPMT 1996]

The aqueous solution of disodium hydrogen phosphate is [MADT Bihar 1982]

Among them intensive property is [AFMC 2004]

In the Thorium series, \[_{90}Th{{}^{232}}\] loses total of 6 a-particles and 4 b-particles in ten stages. The final isotope produced in the series is [MP PET 2001]