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 :

  Válasz

  (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

  Válasz

  (D)

  Zn can oxidise carbon
• 3

  The heat required to raise the temperature of body by 1 K is called :

  Válasz

  (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 :

  Válasz

  (A)

  violates 1^st law of thermodynamics
• 5

  1 M NaCL and 1 M HCL are present in an aqueous solution. The solution is

  Válasz

  (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 :

  Válasz

  (A)

  4x³
• 7

  Species acting as both Bronsted acid and base is :

  Válasz

  (A)

  (HSO₄)^-1
• 8

  Change in volume of the system does not alter which of the following equilibria?

  Válasz

  (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 :

  Válasz

  (C)

  (RT)^-1/2
• 10

  A similarity between optical and geometrical isomerism is that

  Válasz

  (C)

  both are included in stereoisomerism
• 11

  The functional group, which is found in amino acid is

  Válasz

  (D)

  both (a) and (b)
• 12

  Which of the following does not show geometrical isomerism?

  Válasz

  (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

  Válasz

  (B)

  CH₃-CH₂- < (CH₃)₂CH- < (CH₃)₃C-
• 14

  In which of the following species is the underlined carbon having sp³ hybridisation?

  Válasz

  (B)

  
• 15

  The reaction :
  $${(CH)_3}C - Br\buildrel {{H_2}O} \over \longrightarrow {(CH)_3}C - OH$$

  Válasz

  (B)

  substitution reaction
• 16

  Racemic mixture is formed by mixing two

  Válasz

  (B)

  enantiomers with chiral compounds
• 17

  Which of these will not react with acetylene ?

  Válasz

  (A)

  NaOH
• 18

  What is the product when acetylene reacts with hypochlorous acid ?

  Válasz

  (C)

  Cl₂CHCHO
• 19

  In a mixture of A and B, components show negative deviation when :

  Válasz

  (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.

  Válasz

  (B)

  0.0512 ^oC
• 21

  RNA is different from DNA because RNA contains

  Válasz

  (B)

  ribose sugar and uracil
• 22

  How do we differentiate between Fe³⁺ and Cr³⁺ in group III?

  Válasz

  (B)

  by increasing $$NH_4^+$$ ion concentration
• 23

  When primary amine reacts with chloroform in ethanoic KOH then the product is

  Válasz

  (A)

  an isocyanide
• 24

  Which of the following compounds has wrong $$IUPAC$$ name ?

  Válasz

  (C)

  
• 25

  Following types of compounds (as $$I, II$$ )
  
  
  
  are studied in terms of isomerism in :

  Válasz

  (D)

  stereoisomerism
• 26

  The correct order of ionic radius is

  Válasz

  (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

  Válasz

  (B)

  $$Y{b^{ + 3}}\,\, < P{m^{ + 3}}\,\, < C{e^{ + 3}}\,<\,L{a^{ + 3}}$$
• 28

  

  Válasz

  (B)

  
• 29

  Picric acid is :

  Válasz

  (C)

  
• 30

  The type isomerism present in nitropentammine chromium $$\left( {{\rm I}{\rm I}{\rm I}} \right)$$ chloride is :

  Válasz

  (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 :

  Válasz

  (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 :
  
  $$\eqalign{ & Pt({H_2})|{H^ + }(aq)|Pt({H_2}) \cr & \,\,\,\,\,{p_1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,1M\,\,\,\,\,\,\,\,\,\,\,\,{p_2} \cr} $$

  Válasz

  (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 :

  Válasz

  (C)

  E = E_right - E_left
• 34

  Which of the following reaction is possible at anode?

  Válasz

  (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 :

  Válasz

  (D)

  cathode = pure copper, anode = impure sample
• 36

  Which of the following is a redox reaction ?

  Válasz

  (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

  Válasz

  (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

  Válasz

  (A)

  3
• 39

  The differential rate law for the reaction H₂ + I₂ $$\to$$ 2HI is

  Válasz

  (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

  Válasz

  (D)

  8 grams
• 41

  $$\beta$$ - particle is emitted in radioactivity by

  Válasz

  (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

  Válasz

  (A)

  time vs log C_t
• 43

  Which of the following statements is true?

  Válasz

  (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 :

  Válasz

  (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 :

  Válasz

  (C)

  1, 3, 4, 5
• 46

  Which of the following ions has the maximum magnetic moment?

  Válasz

  (A)

  Mn²⁺
• 47

  Most common oxidation states of Ce (cerium) are :

  Válasz

  (A)

  +3, +4
• 48

  A square planar complex is formed by hybridisation of which atomic orbitals ?

  Válasz

  (B)

  s, p_x, p_y, d_{x² - y²}
• 49

  The most stable ion is :

  Válasz

  (C)

  [Fe(CN)₆]^3-
• 50

  CH₃ - Mg - Br is an organometallic compound due to :

  Válasz

  (B)

  C - Mg bond
• 51

  
  What is B?

  Válasz

  (C)

  CH₂ = CHCOOH
• 52

  With increase of temperature, which of these changes?

  Válasz

  (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

  Válasz

  (C)

  C₆H₈N₂
• 54

  Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol^-1) is

  Válasz

  (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)

  Válasz

  (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

  Válasz

  (A)

  -1.51 eV
• 57

  In which of the following species the interatomic bond angle is 109^o28' ?

  Válasz

  (B)

  NH₄⁺, BF₄^-
• 58

  Hybridisation of underline atom changes in

  Válasz

  (A)

  $$\underline {Al} {H_3}$$ changes to $$AlH_4^-$$
• 59

  Which of the following are arranged in an increasing order of their bond strengths?

  Válasz

  (B)

  $$O_2^{2-}$$ < $$O_2^-$$ < $$O_2$$ < $$O_2^{+}$$
• 60

  Acetylene does not react with :

  Válasz

  (D)

  $\mathrm{NaOH}$
• 61

  For a cell given below
  
  
  $$ \begin{aligned} \mathrm{Ag}^{+}+\mathrm{e}^{-} & \longrightarrow \mathrm{Ag}; E^{\circ}=x \\\\ \mathrm{Cu}^{2+}+2 e^{-} & \longrightarrow \mathrm{Cu}{;} E^{\circ}=y \end{aligned} $$
  
  $$ E^{\circ} \text { cell is } $$ :

  Válasz

  (C)

  $y-x$