Important question for iit jee(chemistry)

IMPORTANT QUESTION
IIT JEE - NEET
1) Which of the following order is correct for the first ionization
energies of their elements?
(EAMCET 2009)
1) B < Be < N < O
2) Be < B < N < O
3) B < Be < O < N
4) B < O < Be < N
2) The first ionization potential of four consecutive elements,
present in the second period of the periodic table are 8.3, 11.3,
14.5 and 13.6 eV respectively. Which one of the following is the
first ionization potential (in eV) of nitrogen?
(Eamcet - 2004-M)
1) 13.6
2) 11.3
3) 8.3
4) 14.5
3) The electron configuration of elements A, B and C are [He]2s1,
[Ne]3s1 and [Ar]4s1 respectively. Which one of the following order
is correct for the first ionization potentials (in kJ mol–1) of A, B and
C?
(Eamcet - 2001-E)
1) A > B > C
2) C > B > A
3) B > C >A
4) C > A > C
4) The correct order of second ionization energies of C, N, O and F
is:
(IIT JEE 1991)
1) C > N > O > F
2) O > N > F > C
3) O > F > N > C
4) F > O > N > C
5)The incorrect statement among the following is:
(IIT JEE 1997)
62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993|
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IMPORTANT QUESTION
1) The first ionization potential of Al is less than the first ionization
potential of Mg.
2) The second ionization potential of Mg is greater than the second
ionization potential Na.
3) The first ionization potential of Na is less than the first ionization
potential of Mg.
4) The third ionization potential of Mg is greater than that of Al.
6) The first ionization potentials of Na, Mg, Al and Si are in the
order:
(IIT JEE 1988)
1) Na < Mg > Al < Si
2) Na < Mg < Al > Si
3) Na > Mg > Al > Si
4) Na > Mg > Al < Si
7) The first ionization energy in electron volts of nitrogen and
oxygen atom's are respectively given by:
(IIT JEE 1987)
a) 14.6, 13.6
b) 13.6, 14.6
c) 13.6, 13.6
d) 14.6, 14.6
8) Which of the following species has the highest ionization
potential?
(EAMCET 1998-E)
+

1) Li

2) Mg+
3) Al+
4) Ne
9) The set representing correct order of first ionization potential is:
(IIT JEE 2001)
1) K > Na > Li
2) Be > Mg > Ca
3) B > C > N
4) Ge > Si > C


IMPORTANT QUESTION
10)

Amongst

the

following

elements

(whose

electronic

configurations are given below), the one having the highest
ionization energy is:
(IIT JEE 1990)
a) [Ne] 3s2 3p1
b) [Ar] 3d10 4s2 4p2
c) [Ne] 3s2 3p2
d) [Ne] 3s2 3p3
11) The increasing order of the first ionization enthalpies of the
elements B, P, S and F (lowest first) is:
(AIEEE 2006)
a) F < S < P < B
b) P < S < B < F
c) B < P < S < F
d) B < S < P < F
TYPES OF CHEMICAL BONDS
IIT JEE - NEET
1) The types of bonds present in CuSO4.5H2O are only:
(IIT JEE 1983)
1) electrovalent and covalent
2) electrovalent and coordinate covalent
3) electrovalent, covalent and coordinate covalent
4) covalent and coordinate covalent
2) Which of the following contains both polar and non-polar
bonds?
(IIT JEE 1997)
1) NH4Cl
2) HCN
3) H2O2
4) CH4
3) The number and type of bonds between two carbon atoms in
CaC2 are:
(IIT JEE 1996)
1) one σ and one π bonds
2) one σ and two π bonds

IMPORTANT QUESTION
3) one σ and one and half π bonds
4) one σ bond
4) Which one of the following molecule contains both ionic and
covalent bonds?
(EAMCET 2002-E)
1) CH2Cl2
2) K2SO4
3) BeCl2
4) SO2
5) Element 'X' is strongly electropositive and element 'Y' is
strongly

electronegative.

Both

are

univalent.

The

compound

formed will be:
(IIT JEE 1980)
1) X+Y2) Y+X3) X-Y
4) X→Y
6) The bond between two identical non metal atoms has a pair of
electrons. The correct statement about this pair is:
(IIT JEE 1986)
1) Unequally shared between the two.
2) Transferred fully from one atom to another
3) Has identical spins.
4) Equally shared between the atoms.
7) The bonds present in N2O5 are:
(IIT JEE 1986)
1) only ionic
2) covalent and coordinate
3) only covalent
4) covalent and ionic
THERMODYNAMICS MCQ
IIT JEE
1) Among the following the state function (s) is (are):
(IIT JEE 2009)
1) Internal energy

IMPORTANT QUESTION
2) Reversible expansion work
3) Irreversible expansion work
4) Molar enthalpy
2) Which of the following statements is false?
(IIT JEE 2001)
1) Work is a state function.
2) Work appears at the boundary of the system.
3) Temperature is a state function.
4) Change in the state is completely defined when the initial and final
states are specified.
ELECTROLYTIC CELLS MCQ
IIT JEE
1) A dilute aqueous solution of Na2SO4 is electrolyzed using
platinum electrodes the product at the anode and cathode,
respectively, are:
(IIT JEE 1996)
a) O2 and H2
b) S2O82-, Na
c) O2, Na
d) S2O82-, H2
2) Which of the following statement is correct for electrolytic cell?
(IIT JEE 2003)
1) Electrons flow from cathode to anode through the external battery.
2) Electrons flow from cathode to anode within the electrolytic solution.
3) Migration of ions along with oxidation reaction at anode and
reduction reaction at cathode.
4) Migration of ions along with oxidation reaction at cathode and
reduction reaction at anode.
3) Of the following, the metal that cannot be obtained by
electrolysis of aqueous solution of their salts are:
(IIT JEE 1990)
a) Cr
b) Al
c) Cu
d) Mg

IMPORTANT QUESTION
e) Ag
STOICHIOMETRY OF CRYSTALS
IIT JEE - NEET
1) In a solid 'AB' having NaCl structure, 'A' atoms occupy the
corners of cubic unit cell. If all the face centered atoms along one
of

the

axes

are

removed

then

the

resultant

stoichiometry

(composition) of the solid is:
(IIT JEE 2001)
1) A4B3
2) AB2
3) A2B
4) A3B4
2) A substance AxBy crystallizes in a face centered cubic (FCC)
lattice in which ‘A’ atoms occupy each corner of the cube and ‘B’
atoms occupy the centers of each face of the cube. Identify the
correct composition of the substance AxBy.
(IIT JEE 2002)
A) AB3
B) A4B3
C) A3B
D) Composition cannot be specified.
3) A solid has a structure in which ‘W’ atoms are located at the
corners of a cubic lattice, ‘O’ atoms are at the center of face edges
and Na atoms are at the center of the cube. The formula of the
compound is:
(KURUKSHETRA CEET 1996)
a) Na2WO3
b) Na2WO2
c) NaWO2
d) NaWO3
MOLE FRACTION - PERCENT COMPOSITION
IIT JEE - AIEEE
1) Two solutions of a substance (non electrolyte) are mixed in the
following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M
second solution. What is the molarity of the final mixture?

IMPORTANT QUESTION
(AIEEE 2005 - equivalent to IIT JEE MAIN)
1) 1.20 M
2) 1.344 M
3) 1.50 M
4) 2.70 M
2) The density (in g mL–1) of a 3.60 M sulphuric acid solution that
is 29% H2SO4 (Molar mass = 98 g mol–1) by mass will be:
(AIEEE 2007)
1) 1.45
2) 1.64
3) 1.88
4) 1.22
3) 25 mL of a solution of barium hydroxide on titration with 0.1
molar solution of hydrochloric acid gave titer value of 35 mL. The
molarity of barium hydroxide solution was :
(AIEEE 2003)
1) 0.07
2) 0.14
3) 0.28
4) 0.35
4) The density of a solution prepared by dissolving 120 g of urea
(mol.mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of
this solution is:
(AIEEE 2012)
1) 1.02 M
2) 2.05 M
3) 0.50 M
4) 1.78 M
5) Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL.
The molality of the solution is:
(AIEEE 2006)
1) 1.14 mol kg

-1

2) 3.28 mol kg-1
3) 2.28 mol kg-1
4) 0.44 mol kg-1

IMPORTANT QUESTION
6) With increase in temperature, which of these changes?
(AIEEE 2002)
1) molality
2) fraction of solute present in water
3) weight fraction of solute
4) mole fraction
7) A 5.2 molal aqueous solution of methyl alcohol, CH3OH is
supplied. What is the mole fraction of methyl alcohol in the
solution?
(AIEEE 2011)
(1) 0.050
(2) 1.100
(3) 0.190
(4) 0.086
s-BLOCK - ALKALI METALS MCQ
IIT JEE
1) Molecular formula of Glauber's salt is:
(IIT JEE 1985)
a) MgSO4.7H2O
b) FeSO4.7H2O
c) CuSO4.5H2O
d) Na2SO4.10H2O
2) Which one of the following orders presents the correct sequence
of the increasing basic nature of the given oxides?
(AIEEE 2011)
1) K2O < Na2O < Al2O3 < MgO
2) Al2O3 < MgO < Na2O < K2O
3) MgO < K2O < Al2O3 < Na2O
4) MgO < K2O < Na2O < Al2O3
3) The correct order of stability for the following super oxides is:
(EAMCET 2008 MEDICAL)
1) KO2 > RbO2 > CsO2
2) RbO2 > CsO2 > KO2
3) CsO2 > RbO2 > KO2
4) KO2 > CsO2 > RbO2

IMPORTANT QUESTION
4) The correct order of stability for the following super oxides is:
1) Na2O
2) Na2O2
3) K2O
4) KO2
5) The chemical formula of feldspar is:
(EAMCET 2007 ENGINEERING)
1) KAlSi3O8
2) Na3AlF6
3) NaAlO2
4) K2SO4.Al2(SO4)3.4Al(OH)3
6)

What

are

the

products

formed

when

Li2CO3 undergoes

decomposition?
1) Li2O2, CO
2) Li2O, CO
3) Li2O,CO2
4) LiO2, CO
7) Among the alkali metals, the metal with the highest ionization
potential is:
1) Na
2) Li
3) Rb
4) Cs
8) Alkali metals are:
1) Oxidising agents
2) dehydrating agents
3) reducing agents
4) All the above

d-BLOCK - OXIDATION STATES MCQ
IIT JEE

IMPORTANT QUESTION
1) Amongst the following, identify the species with an atom in
oxidation state +6.
(IIT JEE 2000)
a) MnO4b) Cr(CN)63c) NiF62d) CrO2Cl2
2)

The

maximum

oxidation

states

shown

by

Ru

and

Os,

respectively, are:
(AdiChemistry)
a) +8 and +8
b) +8 and +6
c) +6 and +8
d) +6 and +6
3) The complex ion which has no d-electron in the central metal
ion is:
(IIT JEE 2000)
a) [MnO4]b) [Co(NH3)6]3+
c) [Fe(CN)6]3d) [Cr(H2O)6]3+
4) The pair of compounds having metals in their highest oxidation
state is:
(IIT JEE 2004)
a) MnO2, FeCl3
b) [MnO4]-, CrO2Cl2
c) [Fe(CN)6]3-, [Co(CN)3]
d) [NiCl4]2-, [CoCl4]PARAMAGNETIC & DIAMAGNETIC NATURE OF COORDINATION COMPOUNDS
MCQ
IIT JEE
1) Amongst Ni(CO)4, [Ni(CN)4]2- and NiCl42-:
(IIT JEE 1991)
a)

Ni(CO)4 and NiCl42- are

diamagnetic;

and

[Ni(CN)4]

paramagnetic.

2-

is

IMPORTANT QUESTION
b)

[Ni(CN)4]2- and NiCl42- are

diamagnetic;

and

Ni(CO)4 is

paramagnetic.
c)

Ni(CO)4 and

[Ni(CN)4]2- are

diamagnetic;

and

NiCl42- is

paramagnetic.
d) Ni(CO)4 is diamagnetic; [Ni(CN)4]2- and NiCl42- are paramagnetic.
2) Among the following the lowest degree of paramagnetism per
mole of the compound at 298 K will be shown by:
(IIT JEE 1988)
a) MnSO4.4H2O
b) CuSO4.5H2O
c) FeSO4.6H2O
d) NiSO4.6H2O
3)

Among

the

following

ions

which

one

has

the

highest

paramagnetism?
(IIT JEE 1993)
a) [Cr(H2O)6]3+
b) [Fe(H2O)6]2+
c) [Cu(H2O)6]2+
d) [Zn(H2O)6]2+
ISOMERISM IN ORGANIC COMPOUNDS - MCQ
IIT JEE
1) Which of the following compounds will exhibit cis-trans
isomerism?
(IIT JEE 1983)
a) 2-butene
b) 2-butyne
c) 2-butanol
d) butanal
2) The number of isomers of C6H14 is:
(IIT JEE 1987)
a) 4
b) 5
c) 6
d) 7


IMPORTANT QUESTION
3) The isomers which can be inter converted through rotation
around a single bond are:
(IIT JEE 1992)
a) conformers
b) diastereomers
c) enantiomers
d) positional isomers
4) An isomer of ethanol is:
(IIT JEE 1986)
a) methanol
b) diethyl ether
c) acetone
d) dimethyl ether
5) How many optically active stereoisomers are possible for
butane-2,3-diol?
(IIT JEE 1997)
a) 1
b) 2
c) 3
d) 4
AROMATIC NATURE OF BENZENE - MCQ
IIT JEE
1) An aromatic molecule will :
(IIT JEE 1999)
a) have 4nπ electrons
b) have (4n+2)π electrons
c) be planar
d) be cyclic
2) Give reasons for: "although benzene is highly unsaturated,
normally it does not undergo addition reaction".
(IIT JEE 1983)


Important question for iit jee(chemistry)

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