With a certain radiation (exciting) of a particular frequency, to which hydrogen atoms are exposed, the maximum number of spectral lines is obtainable in the emission is 15. The uppermost energy level to which the is excited is n = 1) 4 2) 5 3) 6 4) 7 Ans: 3 Sol. Number of spectral lines
2. The number of moles of KMnO4 that will be required to react with one mole of ferrous oxalate is
1) 2) 3) 4) 1
Ans: 1 Sol.
3 moles of KMnO4= 5 moles of FeC2O4
∴ 1mol of ferrous oxalate = mol of
KMnO4
3. The sealed containers of the same capac-ity and at the same temperature are filled with 44g of H2 in one and 44g of CO2 in the other. If the pressure of carbondioxide in the second container is 1atm. That of hydrogen in the first container would be 1) 1 atm 2) 10 atm 3) 22 atm 4) 44 atm Ans: 3 Sol.
As V2 = V2 and T1 = T2
Hence 3 is the correct answer
4. Half life of a reaction becomes half when initial concentration of reactants are made doubled. The order of the reaction will be 1) 1 2) 2 3) 0 4) 3 Ans: 2 Sol.
Where n = order of reaction for second order reaction Hence 2 is correct answer
5. The reaction Product, is zero order while the reaction Product, is first order reaction. For what initial concentration of Aare the half lives of the two reactions equal (Rate constant value are same for both two reaction) 1) 2) 2M 3) log 2M 4) ln 2M Ans: 1 Sol. For zero order reaction, x = kt
, i.e .... (i)
For first order reaction, … (ii)
From (i) and (ii),
a=loge 4M Hence 1 is the correct answer
6. The dissociation of phosgene, which occurs according to the reaction
is an endothermic process. Which of the following will increase the degree of dissociation of COCl2? 1) Adding Cl2 to the system 2) Adding helium to the system at constant pressure 3) Decreasing the temperature of the system 4) Increasing the total pressure Ans: 2
7. Which of the following compounds/ions can act as Bronsted acid as well as a Bronsted base ? 1) 2) K2CO3 3) H2SO4 4) Ans: 1
8. Calculate the standard Gibbs free energy change in kJ for the reaction (or) Given: CuI(or)+e → Cu(or)+I-(aq) Eo= -0.17v
1) - 67.55 2) 135.1 3) 1.78V 4) - 1.75V Ans: 1
Sol.
The = - 0.53F - 90.17F) =- 0.70F = -0.70X96500J - -67550J = - 67.55kJ Hence 1 is correct answer
9. In a solid AB+ having NaCl structure atoms B- occupy the corners of the unit cell. If all the face centred atoms along one of the axis are removed, then the resultant stoichiometry of the solid is 1) AB2 2) A2B 3) A4B3 4) AB4 Ans: 3 Sol. In one NaCl type unit cell of solid, B- are present at corners and face centres and A+ are present at edge centres and body centre. Thus, a unit cell will contain 4A+ and 4B- ions. In this unit two face centred ions B- lies along the one axis and are removed Contribution of two face centred B- ions
=
In the resultant unit cell; ∴Number of A+ ions present per unit cell =4 ∴Number of B- ions present per unit cell = 4-1=3 ∴Stoichiometry = A4B3. Hence, (C) is the correct answer
10. The van't Hoff factor for 0.1M Ba(NO3)2 solution is 2.74. The percentage of dissociation is:
1 21 2 ×=
21 ooo GGG ∆ =∆ −∆ ()2 1 0.53 0.53o G F V V ∆ =− × × =− ( ) ( ) 0.53 Cu aq e Cu or E V + + → °= ()1 1 0.17o G F V ∆ =− × × − ( ) ( ) ( ) CuI or e Cu or I aq −+ →+
( ) ( ) 0.53 Cu aq e Cu or E V + + → °=
( ) ( ) Cu aq I aq CuI −− + →
22 H PO −
3HCO −
( ) ( ) ( ) 22 COCl g CO g Cl g +
log 2
2 ea kk =
12
log 2 et k =
12 2 a t k =12
2 a
kt ∴ × ×
() e log 4
kB →
kA →
12
1
t
a
∝
12 1 1 nt a − ∝
2 44 2
22atm 1 44 44 HP ==
22
22
HH
CO CO
Pn
Pn =
11
22
nP Pn =
11 1 1 1 1
2 2 2 2 2 2
n RT PV nT PV n RT n T ==
3 5
23
2 2 4 2
5 22 Fe Fe e C O CO e − + − −− →+ × →+ 22 5 ] 3 Mn e Mn + − + + → ×
4 5
2 5
3 5
() 1 15 6 2 nn n − = ⇒ =
1) 91.3% 2) 87% 3) 100% 4) 74% Ans: 2 Sol.
i= (1+2α)
=87% Hence, (B) is the correct answer
11.The correct match is A B C D A B C D 1) s r q p 2) s p q r 3) p r s q 4) q r s p
Ans: 1 Sol. Hess's law states that enthalpy change in a reaction remains the same whether the reaction takes place in one step or in several steps Combustion reactions are exothermic
It is an example of Clasius Clapeyron equation
12. The pair of species having identical shape is 1) CF4, SF4 2) PCl3, BF3 3) XeF2, CO2 4) PF5, IF5 Ans: 3 Sol. XeF2 and CO2 are linear molecules Hence 3 is the correct answer
13. Nitrobenzene can be prepared from benz-ene by using a mixture of conc. HNO3 and conc. H2SO4. In the nitrating mixture HNO3 acts as a 1) base 2) acid 3) reducing agent 4) catalyst Ans: 1 Sol. HNO3 accepts a proton from H2SO4
Hence 1 is the correct answer
14. Which of the following will give yellow precipitate with I2/NaOH? 1) CH3-CO-O-CO-CH3 2) 3) CH3-CO-NH2
4)
Ans: 2 Sol. ICH2-CO-CH2-CH3 on further treatme-nt with I2/NaOH first give I2CHCOCH2CH3 and then I3C-CO- CH2-CH3 which subsequently undergo-es hydrolysis with NaOH to yield CHI3 and CH3-CH2-COONa Hence, 2 is the correct answer
15. In Cannizzaro reaction given below
The slowest step is 1) the attack of at the carbonyl group 2) the transfer of hydride to the carbonyl group 3) the abstraction of proton from carboxylic acid 4) the deprotonation of Ph - COOH.
16. Consider the following pairs of organic compounds I:
II: CH3OH CH3CH2OH
III: HCHO
A test that can make distinction between each pair is 1) Lucas test 2) Silver-mirror test 3) Victor - Meyer's test 4) Iodoform test Ans: 4
17. In the following compounds, the order of acidity is
I) II)
III) IV)
1) III > IV > I > II 2) I > IV >III >1 3) II > I > III > IV 4) IV > III> I > II Ans: 4 Sol. +1 effect decreases acidity, -I and -R ef-fect increases acidity. NO2 group cannot exert -R effect from the metal position. Hence 4 is the correct answer
18. The equilibrium constant for the reaction
is 5. If the equilibrium mixture contains equal moles of SO3 and SO2, the equilibr-ium partial pressure of O2 gas is 1) 0.2 atm 2) 2 atm 3) 0.02 atm 4) 0.04atm Ans: 1
Sol.
;
As
and hence
19. In P4O10, the number of oxygen atoms attached to each phosphorous atom is 1) 3 2) 2 3) 4 4) 2.5 Ans: 3
20. The dipole moment of is 1.5D. The dipole moment of is
1) 0D 2) 1.5D 3) 2.86D 4) 2.25D Ans: 2
21. Argentite a compound of silver, was treated with potassium
Cl
Cl
ClCl
Cl
2 0.2atmOP =
2
1
5
OP
=5pK =3 2 3 2 , SO SO SO SO n n P P ==
2
3
2 22 . SO
p
SO O
P
K
PP
=
2( ) 2( ) 3( ) 22 g g g SO O SO +
OH
2NO
2NO
OH
3CH
OH OH
33 CH CCH
O
CH2
C
O
H
C
O
CH3
OH
−
2
OH Ph CHO Ph CH OH PhCOO − −− → − − +
O
3 CH C Cl −−
2 2 3 I CH C CH CH − − − −
O
4 +
H
O
N
⊕
O
O
2 4 3 4 H SO HNO HSO −+
2 2 1
1 1 2 ( ) ( ):2.303log vap H p T T Dp p R TT ∆ − →= ( ) ( ) : Br →
( ) ( ) : As →
()2.74 1
0.87 22 ii
α
− − ∴ = = =
() 1 2 1 2i α α α α = − + + = + () 1 0 0 12 ααα −
2 3 2 3 ( ) 2 Ba NO Ba NO− +
cyanide solution. The product obtained has the formula 1) K[Ag (CN)2] 2) K2[Ag(CN)2] 3) K2[Ag(CN)2] 4) K[Ag(CN)4] Ans: 1
22. Statement-1: In acidic medium, Zn+2 is not precipitated by S2ions Statement-2 : Common ion effect reduces the concentration of S2ions to the minimum level 1) Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1 2) Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement -1 3) Statement-1 is true,statement-2 is false 4) Statement-1 is false,statement-2 is true Ans: 1
23. Select the correct order of acidity 1) HI > HBr > HCl > HF 2) HClO4 < HBrO4 < HlO4 3) HClO < HBrO < HIO 4) HClO4 > HClO3 > HClO2 > HClO Ans: 1
24. The process of getting fresh water from sea water is known as 1) osmosis 2) filtration 3) desaltation 4) reverse osmosis Ans: 1 25.
The ratio of number of moles of hydrogen atoms required to get 1 mole of A and 1 mole of B is 1) 4:5 2) 5:4 3) 1:1 4) 2:3 Ans: 1
Sol. A=Azobenzene, B=Hydrazobenzene 26. Which of the following polymers are obtained by step growth polymerization ? A) Nylon 6, 6 B) neoprene C) PVC D) Terylene 1) A, B 2) B, C 3) A, C 4) A, D Ans: 4
27. Incorrect match in the following 1) Molecular oxygen: Diamagnetic 2) Order of stability:
3) Order of bond orders:
4) S.I. unit of dipole moment: Coloumb - metre Ans: 1
28. Ethanal reacts with HCN and the addition product so obtained is hydrolysed to form a new compound. This compound shows 1) Optical isomerism 2) Geometrical isomerism 3) Tautomerism 4) Metamerism Ans: 1 Sol. The new compound formed is Latic acid
2. The number of moles of KMnO4 that will be required to react with one mole of ferrous oxalate is
1) 2) 3) 4) 1
Ans: 1 Sol.
3 moles of KMnO4= 5 moles of FeC2O4
∴ 1mol of ferrous oxalate = mol of
KMnO4
3. The sealed containers of the same capac-ity and at the same temperature are filled with 44g of H2 in one and 44g of CO2 in the other. If the pressure of carbondioxide in the second container is 1atm. That of hydrogen in the first container would be 1) 1 atm 2) 10 atm 3) 22 atm 4) 44 atm Ans: 3 Sol.
As V2 = V2 and T1 = T2
Hence 3 is the correct answer
4. Half life of a reaction becomes half when initial concentration of reactants are made doubled. The order of the reaction will be 1) 1 2) 2 3) 0 4) 3 Ans: 2 Sol.
Where n = order of reaction for second order reaction Hence 2 is correct answer
5. The reaction Product, is zero order while the reaction Product, is first order reaction. For what initial concentration of Aare the half lives of the two reactions equal (Rate constant value are same for both two reaction) 1) 2) 2M 3) log 2M 4) ln 2M Ans: 1 Sol. For zero order reaction, x = kt
, i.e .... (i)
For first order reaction, … (ii)
From (i) and (ii),
a=loge 4M Hence 1 is the correct answer
6. The dissociation of phosgene, which occurs according to the reaction
is an endothermic process. Which of the following will increase the degree of dissociation of COCl2? 1) Adding Cl2 to the system 2) Adding helium to the system at constant pressure 3) Decreasing the temperature of the system 4) Increasing the total pressure Ans: 2
7. Which of the following compounds/ions can act as Bronsted acid as well as a Bronsted base ? 1) 2) K2CO3 3) H2SO4 4) Ans: 1
8. Calculate the standard Gibbs free energy change in kJ for the reaction (or) Given: CuI(or)+e → Cu(or)+I-(aq) Eo= -0.17v
1) - 67.55 2) 135.1 3) 1.78V 4) - 1.75V Ans: 1
Sol.
The = - 0.53F - 90.17F) =- 0.70F = -0.70X96500J - -67550J = - 67.55kJ Hence 1 is correct answer
9. In a solid AB+ having NaCl structure atoms B- occupy the corners of the unit cell. If all the face centred atoms along one of the axis are removed, then the resultant stoichiometry of the solid is 1) AB2 2) A2B 3) A4B3 4) AB4 Ans: 3 Sol. In one NaCl type unit cell of solid, B- are present at corners and face centres and A+ are present at edge centres and body centre. Thus, a unit cell will contain 4A+ and 4B- ions. In this unit two face centred ions B- lies along the one axis and are removed Contribution of two face centred B- ions
=
In the resultant unit cell; ∴Number of A+ ions present per unit cell =4 ∴Number of B- ions present per unit cell = 4-1=3 ∴Stoichiometry = A4B3. Hence, (C) is the correct answer
10. The van't Hoff factor for 0.1M Ba(NO3)2 solution is 2.74. The percentage of dissociation is:
1 21 2 ×=
21 ooo GGG ∆ =∆ −∆ ()2 1 0.53 0.53o G F V V ∆ =− × × =− ( ) ( ) 0.53 Cu aq e Cu or E V + + → °= ()1 1 0.17o G F V ∆ =− × × − ( ) ( ) ( ) CuI or e Cu or I aq −+ →+
( ) ( ) 0.53 Cu aq e Cu or E V + + → °=
( ) ( ) Cu aq I aq CuI −− + →
22 H PO −
3HCO −
( ) ( ) ( ) 22 COCl g CO g Cl g +
log 2
2 ea kk =
12
log 2 et k =
12 2 a t k =12
2 a
kt ∴ × ×
() e log 4
kB →
kA →
12
1
t
a
∝
12 1 1 nt a − ∝
2 44 2
22atm 1 44 44 HP ==
22
22
HH
CO CO
Pn
Pn =
11
22
nP Pn =
11 1 1 1 1
2 2 2 2 2 2
n RT PV nT PV n RT n T ==
3 5
23
2 2 4 2
5 22 Fe Fe e C O CO e − + − −− →+ × →+ 22 5 ] 3 Mn e Mn + − + + → ×
4 5
2 5
3 5
() 1 15 6 2 nn n − = ⇒ =
1) 91.3% 2) 87% 3) 100% 4) 74% Ans: 2 Sol.
i= (1+2α)
=87% Hence, (B) is the correct answer
11.The correct match is A B C D A B C D 1) s r q p 2) s p q r 3) p r s q 4) q r s p
Ans: 1 Sol. Hess's law states that enthalpy change in a reaction remains the same whether the reaction takes place in one step or in several steps Combustion reactions are exothermic
It is an example of Clasius Clapeyron equation
12. The pair of species having identical shape is 1) CF4, SF4 2) PCl3, BF3 3) XeF2, CO2 4) PF5, IF5 Ans: 3 Sol. XeF2 and CO2 are linear molecules Hence 3 is the correct answer
13. Nitrobenzene can be prepared from benz-ene by using a mixture of conc. HNO3 and conc. H2SO4. In the nitrating mixture HNO3 acts as a 1) base 2) acid 3) reducing agent 4) catalyst Ans: 1 Sol. HNO3 accepts a proton from H2SO4
Hence 1 is the correct answer
14. Which of the following will give yellow precipitate with I2/NaOH? 1) CH3-CO-O-CO-CH3 2) 3) CH3-CO-NH2
4)
Ans: 2 Sol. ICH2-CO-CH2-CH3 on further treatme-nt with I2/NaOH first give I2CHCOCH2CH3 and then I3C-CO- CH2-CH3 which subsequently undergo-es hydrolysis with NaOH to yield CHI3 and CH3-CH2-COONa Hence, 2 is the correct answer
15. In Cannizzaro reaction given below
The slowest step is 1) the attack of at the carbonyl group 2) the transfer of hydride to the carbonyl group 3) the abstraction of proton from carboxylic acid 4) the deprotonation of Ph - COOH.
16. Consider the following pairs of organic compounds I:
II: CH3OH CH3CH2OH
III: HCHO
A test that can make distinction between each pair is 1) Lucas test 2) Silver-mirror test 3) Victor - Meyer's test 4) Iodoform test Ans: 4
17. In the following compounds, the order of acidity is
I) II)
III) IV)
1) III > IV > I > II 2) I > IV >III >1 3) II > I > III > IV 4) IV > III> I > II Ans: 4 Sol. +1 effect decreases acidity, -I and -R ef-fect increases acidity. NO2 group cannot exert -R effect from the metal position. Hence 4 is the correct answer
18. The equilibrium constant for the reaction
is 5. If the equilibrium mixture contains equal moles of SO3 and SO2, the equilibr-ium partial pressure of O2 gas is 1) 0.2 atm 2) 2 atm 3) 0.02 atm 4) 0.04atm Ans: 1
Sol.
;
As
and hence
19. In P4O10, the number of oxygen atoms attached to each phosphorous atom is 1) 3 2) 2 3) 4 4) 2.5 Ans: 3
20. The dipole moment of is 1.5D. The dipole moment of is
1) 0D 2) 1.5D 3) 2.86D 4) 2.25D Ans: 2
21. Argentite a compound of silver, was treated with potassium
Cl
Cl
ClCl
Cl
2 0.2atmOP =
2
1
5
OP
=5pK =3 2 3 2 , SO SO SO SO n n P P ==
2
3
2 22 . SO
p
SO O
P
K
PP
=
2( ) 2( ) 3( ) 22 g g g SO O SO +
OH
2NO
2NO
OH
3CH
OH OH
33 CH CCH
O
CH2
C
O
H
C
O
CH3
OH
−
2
OH Ph CHO Ph CH OH PhCOO − −− → − − +
O
3 CH C Cl −−
2 2 3 I CH C CH CH − − − −
O
4 +
H
O
N
⊕
O
O
2 4 3 4 H SO HNO HSO −+
2 2 1
1 1 2 ( ) ( ):2.303log vap H p T T Dp p R TT ∆ − →= ( ) ( ) : Br →
( ) ( ) : As →
()2.74 1
0.87 22 ii
α
− − ∴ = = =
() 1 2 1 2i α α α α = − + + = + () 1 0 0 12 ααα −
2 3 2 3 ( ) 2 Ba NO Ba NO− +
cyanide solution. The product obtained has the formula 1) K[Ag (CN)2] 2) K2[Ag(CN)2] 3) K2[Ag(CN)2] 4) K[Ag(CN)4] Ans: 1
22. Statement-1: In acidic medium, Zn+2 is not precipitated by S2ions Statement-2 : Common ion effect reduces the concentration of S2ions to the minimum level 1) Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1 2) Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement -1 3) Statement-1 is true,statement-2 is false 4) Statement-1 is false,statement-2 is true Ans: 1
23. Select the correct order of acidity 1) HI > HBr > HCl > HF 2) HClO4 < HBrO4 < HlO4 3) HClO < HBrO < HIO 4) HClO4 > HClO3 > HClO2 > HClO Ans: 1
24. The process of getting fresh water from sea water is known as 1) osmosis 2) filtration 3) desaltation 4) reverse osmosis Ans: 1 25.
The ratio of number of moles of hydrogen atoms required to get 1 mole of A and 1 mole of B is 1) 4:5 2) 5:4 3) 1:1 4) 2:3 Ans: 1
Sol. A=Azobenzene, B=Hydrazobenzene 26. Which of the following polymers are obtained by step growth polymerization ? A) Nylon 6, 6 B) neoprene C) PVC D) Terylene 1) A, B 2) B, C 3) A, C 4) A, D Ans: 4
27. Incorrect match in the following 1) Molecular oxygen: Diamagnetic 2) Order of stability:
3) Order of bond orders:
4) S.I. unit of dipole moment: Coloumb - metre Ans: 1
28. Ethanal reacts with HCN and the addition product so obtained is hydrolysed to form a new compound. This compound shows 1) Optical isomerism 2) Geometrical isomerism 3) Tautomerism 4) Metamerism Ans: 1 Sol. The new compound formed is Latic acid
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