IMPORTANT QUESTION
IIT JEE - NEET
1) Which of the following order is correct for the first ionization
energies of their el...
IMPORTANT QUESTION
1) The first ionization potential of Al is less than the first ionization
potential of Mg.
2) The secon...
IMPORTANT QUESTION
10)

Amongst

the

following

elements

(whose

electronic

configurations are given below), the one ha...
IMPORTANT QUESTION
3) one σ and one and half π bonds
4) one σ bond
4) Which one of the following molecule contains both io...
IMPORTANT QUESTION
2) Reversible expansion work
3) Irreversible expansion work
4) Molar enthalpy
2) Which of the following...
IMPORTANT QUESTION
e) Ag
STOICHIOMETRY OF CRYSTALS
IIT JEE - NEET
1) In a solid 'AB' having NaCl structure, 'A' atoms occu...
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...
IMPORTANT QUESTION
6) With increase in temperature, which of these changes?
(AIEEE 2002)
1) molality
2) fraction of solute...
IMPORTANT QUESTION
4) The correct order of stability for the following super oxides is:
(EAMCET 1995 MEDICAL)
1) Na2O
2) N...
IMPORTANT QUESTION
1) Amongst the following, identify the species with an atom in
oxidation state +6.
(IIT JEE 2000)
a) Mn...
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...
IMPORTANT QUESTION
3) The isomers which can be inter converted through rotation
around a single bond are:
(IIT JEE 1992)
a...
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Important question for iit jee(chemistry)

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APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students .

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Important question for iit jee(chemistry)

  1. 1. 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| http://www.apexiit.co.in/
  2. 2. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  3. 3. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  4. 4. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  5. 5. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  6. 6. 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? 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  7. 7. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  8. 8. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  9. 9. IMPORTANT QUESTION 4) The correct order of stability for the following super oxides is: (EAMCET 1995 MEDICAL) 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? (EAMCET 2002 MEDICAL) 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: (EAMCET 1991 ENGINEERING) 1) Na 2) Li 3) Rb 4) Cs 8) Alkali metals are: (EAMCET 1985 ENGINEERING) 1) Oxidising agents 2) dehydrating agents 3) reducing agents 4) All the above d-BLOCK - OXIDATION STATES MCQ IIT JEE 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  10. 10. 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. 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/ 2- is
  11. 11. 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 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/
  12. 12. 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) 62, Nitikhand-3 Indirapuram, Gzb. Call us +91-9910817866 +91-9990495952 , 9310122993| http://www.apexiit.co.in/

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