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JEE MAIN - Chemistry (2002)

1
If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :
Answer
(B)
$$\Delta H$$ and $$\Delta S$$ are both +ve
2
For the reactions
2C + O2 $$\to$$ 2CO2; $$\Delta H$$ = -393 J
2Zn + O2 $$\to$$ 2ZnO; $$\Delta H$$ = -412 J
Answer
(D)
Zn can oxidise carbon
3
The heat required to raise the temperature of body by 1 K is called :
Answer
(B)
thermal capacity
4
A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is J (Q1 + Q2). This data :
Answer
(A)
violates 1st law of thermodynamics
5
1 M NaCL and 1 M HCL are present in an aqueous solution. The solution is
Answer
(A)
not a buffer solution with pH < 7
6
Let the solubility of an aqueous solution of Mg(OH)2 be x then its Ksp is :
Answer
(A)
4x3
7
Species acting as both Bronsted acid and base is :
Answer
(A)
(HSO4)-1
8
Change in volume of the system does not alter which of the following equilibria?
Answer
(A)
N2(g) + O2(g) $$\leftrightharpoons$$ 2NO (g)
9
For the reaction CO (g) + (1/2) O2 (g) $$\leftrightharpoons$$ CO2 (g), Kp/Kc is :
Answer
(C)
(RT)-1/2
10
A similarity between optical and geometrical isomerism is that
Answer
(C)
both are included in stereoisomerism
11
The functional group, which is found in amino acid is
Answer
(D)
both (a) and (b)
12
Which of the following does not show geometrical isomerism?
Answer
(C)
1,1-dichloro-1-pentene
13
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is
Answer
(B)
CH3-CH2- < (CH3)2CH- < (CH3)3C-
14
In which of the following species is the underlined carbon having sp3 hybridisation?
Answer
(B)
AIEEE 2002 Chemistry - Chemical Bonding & Molecular Structure Question 202 English Option 2
15
The reaction :
$${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$
Answer
(B)
substitution reaction
16
Racemic mixture is formed by mixing two
Answer
(B)
enantiomers with chiral compounds
17
Which of these will not react with acetylene ?
Answer
(A)
NaOH
18
What is the product when acetylene reacts with hypochlorous acid ?
Answer
(C)
Cl2CHCHO
19
In a mixture of A and B, components show negative deviation when :
Answer
(D)
A - B interaction is stronger than A - A and B - B interaction
20
Freezing point of an aqueous solution is (-0.186)oC. Elevation of boiling point of the same solution is Kb = 0.512 oC, Kf = 1.86 oC, find the increase in boiling point.
Answer
(B)
0.0512 oC
21
RNA is different from DNA because RNA contains
Answer
(B)
ribose sugar and uracil
22
How do we differentiate between Fe3+ and Cr3+ in group III?
Answer
(B)
by increasing $$NH_4^+$$ ion concentration
23
When primary amine reacts with chloroform in ethanoic KOH then the product is
Answer
(A)
an isocyanide
24
Which of the following compounds has wrong $$IUPAC$$ name ?
Answer
(C)
AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 224 English Option 3
25
Following types of compounds (as $$I, II$$ )

AIEEE 2002 Chemistry - Basics of Organic Chemistry Question 217 English

are studied in terms of isomerism in :
Answer
(D)
stereoisomerism
26
The correct order of ionic radius is
Answer
(A)
$$Ce > Sm > Tb > Lu$$
27
$$C{e^{ + 3}},\,\,L{a^{ + 3}},\,\,P{m^{ + 3}}\,\,$$ and $$Y{b^{ + 3}}\,\,$$ have ionic radial in the increasing order as
Answer
(B)
$$Y{b^{ + 3}}\,\, < P{m^{ + 3}}\,\, < C{e^{ + 3}}\,<\,L{a^{ + 3}}$$
28
AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 214 English
Answer
(B)
AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 214 English Option 2
29
Picric acid is :
Answer
(C)
AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 213 English Option 3
30
The type isomerism present in nitropentammine chromium $$\left( {{\rm I}{\rm I}{\rm I}} \right)$$ chloride is :
Answer
(B)
linkage
31
Conductivity (Seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then, then constant of proportionality is expressed in :
Answer
(B)
Sm2 mol-1
32
For the following cell with hydrogen electrodes at two different pressure p1 and p2. What will be the emf for the given cell :

$$\eqalign{ & Pt({H_2})|{H^ + }(aq)|Pt({H_2}) \cr & \,\,\,\,\,{p_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,1M\,\,\,\,\,\,\,\,\,\,\,\,{p_2} \cr} $$
Answer
(B)
$${{RT} \over 2F}{\log _e}{{{P_1}} \over {{P_2}}}$$
33
EMF of a cell in terms of reduction potential of its left and right electrodes is :
Answer
(C)
E = Eright - Eleft
34
Which of the following reaction is possible at anode?
Answer
(A)
2Cr3+ + 7H2O $$\to Cr_2O_7^{2-}$$ + 14H+
35
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are :
Answer
(D)
cathode = pure copper, anode = impure sample
36
Which of the following is a redox reaction ?
Answer
(D)
Zn + 2AgCN $$\to$$ 2Ag+ Zn(CN)2
37
Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively
Answer
(A)
sec-1, Msec-1
38
For the reaction A + 2B $$\to$$ C, rate is given by R = [A] [B]2 then the order of the reaction is
Answer
(A)
3
39
The differential rate law for the reaction H2 + I2 $$\to$$ 2HI is
Answer
(D)
$$ - 2{{d\left[ {{H_2}} \right]} \over {dt}}$$ = $$ - 2{{d\left[ {{I_2}} \right]} \over {dt}}$$ = $${{d\left[ {{HI}} \right]} \over {dt}}$$
40
If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is
Answer
(D)
8 grams
41
$$\beta$$ - particle is emitted in radioactivity by
Answer
(C)
conversion of neutron to proton
42
The integrated rate equation is Rt = log C0 - log Ct . The straight line graph is obtained by plotting
Answer
(A)
time vs log Ct
43
Which of the following statements is true?
Answer
(C)
chemical bond formation takes place when forces of attraction overcome the forces of repulsion
44
Oxidation number of Cl in CaOCl2 (bleaching powder) is :
Answer
(D)
+1 and -1 since it contains ClO- and Cl-
45
When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2 then the number of electrons transferred in each case respectively is :
Answer
(C)
1, 3, 4, 5
46
Which of the following ions has the maximum magnetic moment?
Answer
(A)
Mn2+
47
Most common oxidation states of Ce (cerium) are :
Answer
(A)
+3, +4
48
A square planar complex is formed by hybridisation of which atomic orbitals ?
Answer
(B)
s, px, py, dx2 - y2
49
The most stable ion is :
Answer
(C)
[Fe(CN)6]3-
50
CH3 - Mg - Br is an organometallic compound due to :
Answer
(B)
C - Mg bond
51
AIEEE 2002 Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 235 English
What is B?
Answer
(C)
CH2 = CHCOOH
52
With increase of temperature, which of these changes?
Answer
(C)
molarity
53
In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight . Molecular weight of the compound is 108 g mol-1 . Molecular formula of compound is
Answer
(C)
C6H8N2
54
Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol-1) is
Answer
(A)
twice that in 60 g carbon
55
Uncertainty in position of a minute particle of mass 25 g in space is 10-5 m. What is the uncertainty in its velocity (in ms-1) (h = 6.6 $$\times$$ 10-34 Js)
Answer
(C)
2.1 $$\times$$ 10-28
56
In a hydrogen atom, if energy of an electron in ground state is -13.6 eV, then that in the 2nd excited state is
Answer
(A)
-1.51 eV
57
In which of the following species the interatomic bond angle is 109o28' ?
Answer
(B)
NH4+, BF4-
58
Hybridisation of underline atom changes in
Answer
(A)
$$\underline {Al} {H_3}$$ changes to $$AlH_4^-$$
59
Which of the following are arranged in an increasing order of their bond strengths?
Answer
(B)
$$O_2^{2-}$$ < $$O_2^-$$ < $$O_2$$ < $$O_2^{+}$$
60
Acetylene does not react with :
Answer
(D)
$\mathrm{NaOH}$
61
For a cell given below

AIEEE 2002 Chemistry - Electrochemistry Question 46 English
$$ \begin{aligned} \mathrm{Ag}^{+}+\mathrm{e}^{-} & \longrightarrow \mathrm{Ag}; E^{\circ}=x \\\\ \mathrm{Cu}^{2+}+2 e^{-} & \longrightarrow \mathrm{Cu}{;} E^{\circ}=y \end{aligned} $$

$$ E^{\circ} \text { cell is } $$ :
Answer
(C)
$y-x$