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 :
คำตอบ
(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
คำตอบ
(D)
Zn can oxidise carbon
3
The heat required to raise the temperature of body by 1 K is called :
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(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 :
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(A)
violates 1^st law of thermodynamics
5
1 M NaCL and 1 M HCL are present in an aqueous solution. The solution is
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(A)
not a buffer solution with pH < 7
6
Let the solubility of an aqueous solution of Mg(OH)₂ be x then its K_sp is :
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(A)
4x³
7
Species acting as both Bronsted acid and base is :
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(A)
(HSO₄)^-1
8
Change in volume of the system does not alter which of the following equilibria?
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(A)
N₂(g) + O₂(g) $$\leftrightharpoons$$ 2NO (g)
9
For the reaction CO (g) + (1/2) O₂ (g) $$\leftrightharpoons$$ CO₂ (g), K_p/K_c is :
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(C)
(RT)^-1/2
10
A similarity between optical and geometrical isomerism is that
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(C)
both are included in stereoisomerism
11
The functional group, which is found in amino acid is
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(D)
both (a) and (b)
12
Which of the following does not show geometrical isomerism?
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(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
คำตอบ
(B)
CH₃-CH₂- < (CH₃)₂CH- < (CH₃)₃C-
14
In which of the following species is the underlined carbon having sp³ hybridisation?
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(B)
15
The reaction :
$${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$
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(B)
substitution reaction
16
Racemic mixture is formed by mixing two
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(B)
enantiomers with chiral compounds
17
Which of these will not react with acetylene ?
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(A)
NaOH
18
What is the product when acetylene reacts with hypochlorous acid ?
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(C)
Cl₂CHCHO
19
In a mixture of A and B, components show negative deviation when :
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(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 K_b = 0.512 ^oC, K_f = 1.86 ^oC, find the increase in boiling point.
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(B)
0.0512 ^oC
21
RNA is different from DNA because RNA contains
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(B)
ribose sugar and uracil
22
How do we differentiate between Fe³⁺ and Cr³⁺ in group III?
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(B)
by increasing $$NH_4^+$$ ion concentration
23
When primary amine reacts with chloroform in ethanoic KOH then the product is
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(A)
an isocyanide
24
Which of the following compounds has wrong $$IUPAC$$ name ?
คำตอบ
(C)
25
Following types of compounds (as $$I, II$$ )

are studied in terms of isomerism in :
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(D)
stereoisomerism
26
The correct order of ionic radius is
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(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
คำตอบ
(B)
$$Y{b^{ + 3}}\,\, < P{m^{ + 3}}\,\, < C{e^{ + 3}}\,<\,L{a^{ + 3}}$$
28
คำตอบ
(B)
29
Picric acid is :
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(C)
30
The type isomerism present in nitropentammine chromium $$\left( {{\rm I}{\rm I}{\rm I}} \right)$$ chloride is :
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(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 :
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(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 :

$$\eqalign{ & Pt({H_2})|{H^ + }(aq)|Pt({H_2}) \cr & \,\,\,\,\,{p_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,1M\,\,\,\,\,\,\,\,\,\,\,\,{p_2} \cr} $$
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(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 :
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(C)
E = E_right - E_left
34
Which of the following reaction is possible at anode?
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(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 :
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(D)
cathode = pure copper, anode = impure sample
36
Which of the following is a redox reaction ?
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(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
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(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
คำตอบ
(A)
3
39
The differential rate law for the reaction H₂ + I₂ $$\to$$ 2HI is
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(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
คำตอบ
(D)
8 grams
41
$$\beta$$ - particle is emitted in radioactivity by
คำตอบ
(C)
conversion of neutron to proton
42
The integrated rate equation is Rt = log C₀ - log C_t . The straight line graph is obtained by plotting
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(A)
time vs log C_t
43
Which of the following statements is true?
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(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 :
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(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 :
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(C)
1, 3, 4, 5
46
Which of the following ions has the maximum magnetic moment?
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(A)
Mn²⁺
47
Most common oxidation states of Ce (cerium) are :
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(A)
+3, +4
48
A square planar complex is formed by hybridisation of which atomic orbitals ?
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(B)
s, p_x, p_y, d_{x² - y²}
49
The most stable ion is :
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(C)
[Fe(CN)₆]^3-
50
CH₃ - Mg - Br is an organometallic compound due to :
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(B)
C - Mg bond
51

What is B?
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(C)
CH₂ = CHCOOH
52
With increase of temperature, which of these changes?
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(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
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(C)
C₆H₈N₂
54
Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol^-1) is
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(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)
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(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 2^nd excited state is
คำตอบ
(A)
-1.51 eV
57
In which of the following species the interatomic bond angle is 109^o28' ?
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(B)
NH₄⁺, BF₄^-
58
Hybridisation of underline atom changes in
คำตอบ
(A)
$$\underline {Al} {H_3}$$ changes to $$AlH_4^-$$
59
Which of the following are arranged in an increasing order of their bond strengths?
คำตอบ
(B)
$$O_2^{2-}$$ < $$O_2^-$$ < $$O_2$$ < $$O_2^{+}$$
60
Acetylene does not react with :
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(D)
$\mathrm{NaOH}$
61
For a cell given below

$$ \begin{aligned} \mathrm{Ag}^{+}+\mathrm{e}^{-} & \longrightarrow \mathrm{Ag}; E^{\circ}=x \\\\ \mathrm{Cu}^{2+}+2 e^{-} & \longrightarrow \mathrm{Cu}{;} E^{\circ}=y \end{aligned} $$

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