11242 + Mcqs in Chemistry Page 120 McqOptions

5951.	Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at 300 K is (Gas constant = 2) [AIIMS 2000]
A.	938.8 cal.
B.	1138.8 cal.
C.	1381.8 cal.
D.	1581.8 cal.
Answer» D. 1581.8 cal.

Discussion

5952.	Which of the following is always negative for exothermic reaction? [BCECE 2005]
A.	DH
B.	DS
C.	DG
D.	None of these
Answer» B. DS

Discussion

5953.	The enthalpy of neutralization of which of the following acids and bases is nearly \[-13.6\,Kcal\] [Roorkee 1999]
A.	HCN and NaOH
B.	HCl and KOH
C.	HCl and NaOH
D.	HCl and NH4OH
Answer» C. HCl and NaOH

Discussion

5954.	The relation between change in internal energy \[(\Delta E)\], change in enthalpy \[(\Delta H)\] and work done (W) is represented as [AFMC 1999]
A.	\[\Delta H=\Delta E+W\]
B.	\[W=\Delta E-\Delta H\]
C.	\[\Delta E=W-\Delta H\]
D.	\[\Delta E=\Delta H+W\]
Answer» B. \[W=\Delta E-\Delta H\]

Discussion

5955.	The internal energy of a substance [KCET 1998; AFMC 2001; AIIMS 2001]
A.	Increases with increase in temperature
B.	Decreases with increase in temperature
C.	Can be calculated by the relation \[E=m{{c}^{2}}\]
D.	Remains unaffected with change in temperature
Answer» B. Decreases with increase in temperature

Discussion

5956.	An ideal gas at constant temperature and pressure expands, then its [BHU 1998]
A.	Internal energy remains same
B.	Internal energy decreases
C.	Internal energy increases
D.	Entropy first increases and then decreases
Answer» B. Internal energy decreases

Discussion

5957.	A schematic plot of \[\ln {{K}_{eq}}\]versus inverse of temperature for a reaction is shown below The reaction must be [AIEEE 2005]
A.	Exothermic
B.	Endothermic
C.	One with negligible enthalpy change
D.	Highly spontaneous at ordinary temperature
Answer» B. Endothermic

Discussion

5958.	Hess law of heat summation includes [AFMC 1992]
A.	Initial reactants only
B.	Initial reactants and final products
C.	Final products only
D.	Intermediates only
Answer» C. Final products only

Discussion

5959.	In a reversible isothermal process, the change in internal energy is
A.	Zero
B.	Positive
C.	Negative
D.	None of these
Answer» B. Positive

Discussion

5960.	Which of the following expressions represents the first law of thermodynamics [MP PET 1996, 2000; AFMC 1997; BHU 1999; AMU 2000; KCET (Med.) 2000, 01; CBSE PMT 2000; MP PMT 2002]
A.	\[\Delta E=-q+W\]
B.	\[\Delta E=q-W\]
C.	\[\Delta E=q+W\]
D.	\[\Delta E=-q-W\]
Answer» D. \[\Delta E=-q-W\]

Discussion

5961.	The heat \[Q\] for a reaction at constant volume is equal to
A.	\[{{H}_{P}}-{{H}_{R}}\]
B.	\[{{H}_{R}}-{{H}_{P}}\]
C.	\[{{E}_{P}}-{{E}_{R}}\]
D.	None of these
Answer» D. None of these

Discussion

5962.	A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If \[\Delta H\] is the enthalpy change and \[\Delta E\] is the change in internal energy, then [KCET 2005]
A.	\[\Delta H>\Delta E\]
B.	\[\Delta H<\Delta E\]
C.	\[\Delta H=\Delta E\]
D.	The relationship depends on the capacity of the vessel
Answer» C. \[\Delta H=\Delta E\]

Discussion

5963.	The enthalpies of the elements in their standard states are assumed to be
A.	Zero at 298 K
B.	Unit at 298 K
C.	Zero at all temperatures
D.	Zero at 273 K
Answer» B. Unit at 298 K

Discussion

5964.	The law of conservation of energy states that [NCERT 1984]
A.	The internal energy of a system is constant
B.	The heat content of a system is constant
C.	Energy is neither created nor destroyed
D.	There is an equivalence between energy and mass
Answer» D. There is an equivalence between energy and mass

Discussion

5965.	The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at \[{{25}^{o}}C\] is [CMC Vellore 1991]
A.	\[2.303\times 298\times 0.082\,\log \,2\]
B.	\[298\times {{10}^{7}}\times 8.31\times 2.303\,\log \,2\]
C.	\[2.303\times 298\times 0.082\,\log \,0.5\]
D.	\[8.31\times {{10}^{7}}\times 298-2.303\,\log \,0.5\]
E.	\[2.303\times 298\times 2\,\log \,2\]
Answer» C. \[2.303\times 298\times 0.082\,\log \,0.5\]

Discussion

5966.	During an isothermal expansion of an ideal gas its [CBSE PMT 1991]
A.	Internal energy increases
B.	Enthalpy decreases
C.	Enthalpy remains unaffected
D.	Enthalpy reduces to zero
Answer» D. Enthalpy reduces to zero

Discussion

5967.	Hess law is applicable for the determination of heat of [AIIMS 1998; Pb. PET/PMT 1999]
A.	Reaction
B.	Formation
C.	Transition
D.	All of these
Answer» C. Transition

Discussion

5968.	Enthalpy for the reaction \[C+{{O}_{2}}\to C{{O}_{2}}\] is [DPMT 1987, 91]
A.	Positive
B.	Negative
C.	Zero
D.	None
Answer» C. Zero

Discussion

5969.	Which of the following is the correct equation [CBSE PMT 1996]
A.	\[\Delta U=\Delta Q-W\]
B.	\[\Delta W=\Delta U+\Delta Q\]
C.	\[\Delta U=\Delta W+\Delta Q\]
D.	None of these
Answer» D. None of these

Discussion

5970.	Consider the reaction : \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\] carried out at constant temperature and pressure. If \[\Delta H\] and \[\Delta U\] are the enthalpy and internal energy changes for the reaction, which of the following expression is true [AIEEE 2005]
A.	\[\Delta H=0\]
B.	\[\Delta H=\Delta U\]
C.	\[\Delta H<\Delta U\]
D.	\[\Delta H>\Delta U\]
Answer» D. \[\Delta H>\Delta U\]

Discussion

5971.	Hess's law of constant heat summation in based on [MP PET 2001]
A.	\[E=m{{c}^{2}}\]
B.	Conservation of mass
C.	First law of thermodynamics
D.	None of the above
Answer» D. None of the above

Discussion

5972.	If \[\Delta H\] is the change in enthalpy and \[\Delta E\] the change in internal energy accompanying a gaseous reaction KCET 1989; CBSE PMT 1990]
A.	\[\Delta H\] is always greater than \[\Delta E\]
B.	\[\Delta H<\Delta E\] only if the number of moles of the products is greater than the number of the reactants
C.	\[\Delta H\] is always less than \[\Delta E\]
D.	\[\Delta H<\Delta E\] only if the number of moles of the products is less than the number of moles of the reactants
Answer» E.

Discussion

5973.	?The resultant heat change in a reaction is the same whether it takes place in one or several stages.? This statement is called [MP PMT/PET 1988; MP PMT 1989]
A.	Lavoisier and Laplace law
B.	Hess's law
C.	Joule's law
D.	Le?chatelier's principle
Answer» C. Joule's law

Discussion

5974.	The first law of thermodynamics is only
A.	The law of conservation of energy
B.	The law of conservation of mass
C.	The law of conservation of momentum
D.	Both A and B
Answer» E.

Discussion

5975.	Which of the following is obtained when an oil is hydrolysed with alkali
A.	Fat
B.	Wax
C.	Soap
D.	Vitamin
Answer» D. Vitamin

Discussion

5976.	Hardening of oils is caused by
A.	\[{{H}_{2}}\]
B.	\[{{N}_{2}}\]
C.	\[{{O}_{2}}\]
D.	\[C{{O}_{2}}\]
Answer» B. \[{{N}_{2}}\]

Discussion

5977.	The ?iodine value? of an oil indicates
A.	Its boiling point
B.	Inflammability
C.	Unsaturation present in acid contents
D.	Solubility of salt in oils
Answer» D. Solubility of salt in oils

Discussion

5978.	The ?saponification value? of an oil or fat is measured in terms of
A.	\[N{{H}_{4}}OH\]
B.	NaOH
C.	KOH
D.	\[{{C}_{6}}{{H}_{5}}OH\]
Answer» D. \[{{C}_{6}}{{H}_{5}}OH\]

Discussion

5979.	Which of the following is not a lipid
A.	Oils
B.	Fats
C.	Waxes
D.	Proteins
Answer» E.

Discussion

5980.	An example for a saturated fatty acid, present in nature is [KCET 2005]
A.	Oleic acid
B.	linoleic acid
C.	Linolenic acid
D.	Palmitic acid
Answer» E.

Discussion

5981.	Oleic, stearic and palmitic acids are [Pb. CET 2002]
A.	Fatty acid
B.	Amino acid
C.	Nucleic acid
D.	Essential acid
Answer» B. Amino acid

Discussion

5982.	\[\underset{C{{H}_{2}}OOC{R}'''}{\overset{C{{H}_{2}}OOC{R}'\,}{\mathop{\underset{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\overset{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CHOOCR''\,\,}}}\,}}}\,\underset{\text{Hydrolysis}}{\mathop{\xrightarrow{\text{Enzyme}}}}\,\overset{C{{H}_{2}}OH}{\mathop{\underset{C{{H}_{2}}OH}{\mathop{\underset{\|\,\,\,\,\,\,\,\ \,\,\,\,\,\,\,\,}{\overset{\|\,\,\,\,\,\,\,\,\ \,\,\,\,\,\,\,}{\mathop{CHOH}}}\,}}\,}}\,+\underset{{R}'''COOH}{\overset{{R}'COOH}{\mathop{\underset{+}{\overset{+}{\mathop{{R}''COOH\,}}}\,}}}\,\] The enzyme used in the above reaction is [AMU 2003]
A.	Amylase
B.	Lactase
C.	Lipase
D.	Invertase
Answer» D. Invertase

Discussion

5983.	Oils and fats are jointly called [MP PET 2003]
A.	Lipids
B.	Soaps
C.	Proteins
D.	Polymer
Answer» B. Soaps

Discussion

5984.	Phospholipids are esters of glycerol with [CBSE PMT 2003]
A.	Three phosphate groups
B.	Three carboxylic acid residues
C.	Two carboxylic acid residues and one phosphate group
D.	One carboxylic acid residue and two phosphate groups
Answer» E.

Discussion

5985.	Iodine value is related to [MP PET 2002]
A.	Fats and oils
B.	Alcohols
C.	Esters
D.	Hydrocarbons
Answer» B. Alcohols

Discussion

5986.	Fat consists of [MH CET 2002]
A.	Monohydroxy carboxylic acid
B.	Monohydroxy aliphatic carboxylic acid
C.	Monohydroxy aliphatic, saturated carboxylic acid
D.	Dihydroxy aliphatic carboxylic acid
Answer» D. Dihydroxy aliphatic carboxylic acid

Discussion

5987.	On hydrolysis, all lipids yield
A.	Monocarboxylic acids
B.	Monohydric alcohols
C.	Monohaloalkanes
D.	Enzymes
Answer» B. Monohydric alcohols

Discussion

5988.	Hydrolytic reaction of fats, with caustic soda, is known as [Kerala (Med.) 2000; Pb. PMT 2004; MNR 1988]
A.	Acetylation
B.	Carboxylation
C.	Saponification
D.	Esterification
Answer» D. Esterification

Discussion

5989.	The waxes are long chain compounds of fatty acids, which belong to the class of [BHU 1999; AFMC 2005]
A.	Esters
B.	Ethers
C.	Alcohols
D.	Acetic acid
Answer» B. Ethers

Discussion

5990.	A distinctive and characteristic functional group of fats is [Kerala (Med.) 1999; AFMC 2005]
A.	An ester group
B.	A peptide group
C.	A ketonic group
D.	An alcoholic group
Answer» B. A peptide group

Discussion

5991.	Which is not a macromolecule [BHU 1998]
A.	DNA
B.	Starch
C.	Palmitate
D.	Insulin
Answer» D. Insulin

Discussion

5992.	Which of the following compounds do not belong to lipids [AFMC 1998]
A.	Fats
B.	Amino acids
C.	Phospholipids
D.	Carbohydrates
Answer» C. Phospholipids

Discussion

5993.	Cell membrane contains
A.	Alternate layers of phospholipid and coline
B.	Double layers of phospholipid
C.	Double layers of phospholipid with polar ends projected outside
D.	Double layers of phospholipid with polar ends projected inside
Answer» D. Double layers of phospholipid with polar ends projected inside

Discussion

5994.	The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by [NCERT 1984; AFMC 1988]
A.	Proteins
B.	Fats
C.	Carbohydrates
D.	Vitamins
Answer» C. Carbohydrates

Discussion

5995.	Which of the following gives maximum energy in metabolic processes [CPMT 1991; MP PET 1999]
A.	Proteins
B.	Carbohydrates
C.	Lipids
D.	Vitamins
Answer» D. Vitamins

Discussion

5996.	The most important food reserves of animals and plants are [MP PET 1993]
A.	Carbohydrates
B.	Proteins
C.	Vitamins
D.	Fats
Answer» E.

Discussion

5997.	Which of the following is not glyceride
A.	Lipids (simple)
B.	Phospholipids
C.	Sphingolipids
D.	All
Answer» D. All

Discussion

5998.	Tripalmitin is
A.	A protein
B.	An enzyme
C.	A lipid
D.	A carbohydrate
Answer» D. A carbohydrate

Discussion

5999.	During electrolysis of aqueous \[NaOH,\,4\,g\] of \[{{O}_{2}}\] gas is liberated at \[NTP\] at anode, \[{{H}_{2}}\] gas liberated at cathode is [CBSE PMT 1998]
A.	2.8 litres
B.	5.6 litres
C.	11.2 litres
D.	22.4 litres
Answer» C. 11.2 litres

Discussion

6000.	An electric current is passed through silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is [Kerala (Med.) 2003]
A.	56 \[c{{m}^{3}}\]
B.	550 \[c{{m}^{3}}\]
C.	5.6 \[c{{m}^{3}}\]
D.	11.2 \[c{{m}^{3}}\]
E.	22.4 \[c{{m}^{3}}\]
Answer» D. 11.2 \[c{{m}^{3}}\]

Discussion

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

Work done during isothermal expansion of one mole of an ideal gas from 10 atm to 1 atm at 300 K is (Gas constant = 2) [AIIMS 2000]

Which of the following is always negative for exothermic reaction? [BCECE 2005]

The enthalpy of neutralization of which of the following acids and bases is nearly \[-13.6\,Kcal\] [Roorkee 1999]

The relation between change in internal energy \[(\Delta E)\], change in enthalpy \[(\Delta H)\] and work done (W) is represented as [AFMC 1999]

The internal energy of a substance [KCET 1998; AFMC 2001; AIIMS 2001]

An ideal gas at constant temperature and pressure expands, then its [BHU 1998]

A schematic plot of \[\ln {{K}_{eq}}\]versus inverse of temperature for a reaction is shown below The reaction must be [AIEEE 2005]

Hess law of heat summation includes [AFMC 1992]

In a reversible isothermal process, the change in internal energy is

Which of the following expressions represents the first law of thermodynamics [MP PET 1996, 2000; AFMC 1997; BHU 1999; AMU 2000; KCET (Med.) 2000, 01; CBSE PMT 2000; MP PMT 2002]

The heat \[Q\] for a reaction at constant volume is equal to

A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If \[\Delta H\] is the enthalpy change and \[\Delta E\] is the change in internal energy, then [KCET 2005]

The enthalpies of the elements in their standard states are assumed to be

The law of conservation of energy states that [NCERT 1984]

The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at \[{{25}^{o}}C\] is [CMC Vellore 1991]

During an isothermal expansion of an ideal gas its [CBSE PMT 1991]

Hess law is applicable for the determination of heat of [AIIMS 1998; Pb. PET/PMT 1999]

Enthalpy for the reaction \[C+{{O}_{2}}\to C{{O}_{2}}\] is [DPMT 1987, 91]

Which of the following is the correct equation [CBSE PMT 1996]

Consider the reaction : \[{{N}_{2}}+3{{H}_{2}}\to 2N{{H}_{3}}\] carried out at constant temperature and pressure. If \[\Delta H\] and \[\Delta U\] are the enthalpy and internal energy changes for the reaction, which of the following expression is true [AIEEE 2005]

Hess's law of constant heat summation in based on [MP PET 2001]

If \[\Delta H\] is the change in enthalpy and \[\Delta E\] the change in internal energy accompanying a gaseous reaction KCET 1989; CBSE PMT 1990]

?The resultant heat change in a reaction is the same whether it takes place in one or several stages.? This statement is called [MP PMT/PET 1988; MP PMT 1989]

The first law of thermodynamics is only

Which of the following is obtained when an oil is hydrolysed with alkali

Hardening of oils is caused by

The ?iodine value? of an oil indicates

The ?saponification value? of an oil or fat is measured in terms of

Which of the following is not a lipid

An example for a saturated fatty acid, present in nature is [KCET 2005]

Oleic, stearic and palmitic acids are [Pb. CET 2002]

Oils and fats are jointly called [MP PET 2003]

Phospholipids are esters of glycerol with [CBSE PMT 2003]

Iodine value is related to [MP PET 2002]

Fat consists of [MH CET 2002]

On hydrolysis, all lipids yield

Hydrolytic reaction of fats, with caustic soda, is known as [Kerala (Med.) 2000; Pb. PMT 2004; MNR 1988]

The waxes are long chain compounds of fatty acids, which belong to the class of [BHU 1999; AFMC 2005]

A distinctive and characteristic functional group of fats is [Kerala (Med.) 1999; AFMC 2005]

Which is not a macromolecule [BHU 1998]

Which of the following compounds do not belong to lipids [AFMC 1998]

Cell membrane contains

The energy change produced by the combustion of food is called the 'calorific value'. The highest calorific value is given by [NCERT 1984; AFMC 1988]

Which of the following gives maximum energy in metabolic processes [CPMT 1991; MP PET 1999]

The most important food reserves of animals and plants are [MP PET 1993]

Which of the following is not glyceride

Tripalmitin is

During electrolysis of aqueous \[NaOH,\,4\,g\] of \[{{O}_{2}}\] gas is liberated at \[NTP\] at anode, \[{{H}_{2}}\] gas liberated at cathode is [CBSE PMT 1998]

An electric current is passed through silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is [Kerala (Med.) 2003]