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 :
პასუხი
(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
პასუხი
(D)
Zn can oxidise carbon
3
The heat required to raise the temperature of body by 1 K is called :
პასუხი
(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 :
პასუხი
(A)
violates 1^st law of thermodynamics
5
1 M NaCL and 1 M HCL are present in an aqueous solution. The solution is
პასუხი
(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 :
პასუხი
(A)
4x³
7
Species acting as both Bronsted acid and base is :
პასუხი
(A)
(HSO₄)^-1
8
Change in volume of the system does not alter which of the following equilibria?
პასუხი
(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 :
პასუხი
(C)
(RT)^-1/2
10
A similarity between optical and geometrical isomerism is that
პასუხი
(C)
both are included in stereoisomerism
11
The functional group, which is found in amino acid is
პასუხი
(D)
both (a) and (b)
12
Which of the following does not show geometrical isomerism?
პასუხი
(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
პასუხი
(B)
CH₃-CH₂- < (CH₃)₂CH- < (CH₃)₃C-
14
In which of the following species is the underlined carbon having sp³ hybridisation?
პასუხი
(B)
15
The reaction :
$${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$
პასუხი
(B)
substitution reaction
16
Racemic mixture is formed by mixing two
პასუხი
(B)
enantiomers with chiral compounds
17
Which of these will not react with acetylene ?
პასუხი
(A)
NaOH
18
What is the product when acetylene reacts with hypochlorous acid ?
პასუხი
(C)
Cl₂CHCHO
19
In a mixture of A and B, components show negative deviation when :
პასუხი
(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.
პასუხი
(B)
0.0512 ^oC
21
RNA is different from DNA because RNA contains
პასუხი
(B)
ribose sugar and uracil
22
How do we differentiate between Fe³⁺ and Cr³⁺ in group III?
პასუხი
(B)
by increasing $$NH_4^+$$ ion concentration
23
When primary amine reacts with chloroform in ethanoic KOH then the product is
პასუხი
(A)
an isocyanide
24
Which of the following compounds has wrong $$IUPAC$$ name ?
პასუხი
(C)
25
Following types of compounds (as $$I, II$$ )

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

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

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

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

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