101 Identify the lowest molecular weight alkane containing a quarternary carbon –
(A) 2, 2-dimethylpropane
(B) 2, 3-dimethylbutane
(C) 2-methylbutane
(D) propane
102 Reason for less reactivity of benzene than ethene and ethyne towards addition res
(A) presence of 3 π bonds
(B) cyclic nature
(C) sp- hybridization of C atoms
(D) delocalization of e,
103 The correct order of atomic size of C, N, P, S follows the order –
(A) N <P
(B) N (C) C (D) C< N
104 In the modern periodic table, the period indicates the value of –
(A) atomic number
(B) atomic mass
(C) principal quantum number
(D) azimuthal quantum number
105 The element that has highest electron gain enthalpy is –
(A) F
(B) C 1
(C) 0
(D) N
106 The electronegativities of the following elements :
H, O, F, S and Cl increase in the order
(A) H < O < F < S <Cl
(B) Cl < H < O < F < S
(C) H < S < O < Cl < F
(D) H < S < Cl < O < F
107 The percentage of π character in the orbitals forming P-P bonds in P4 is –
(A) 25
(B) 33
(C) 50
(D) 75
108 The interhalogen compound that has a dimeric structure is –
(A) CIF 3
(B) ICI3
(C) BrF3
(D) IF3
109 which pump is mportant in biologicalmical reaction in human body ?
(A) Ca-Ne pump
(B) K-Fe pump
(C) Ng-K pump
(D) Fe-Ca pump
110 The vapour density of completely dissociated NH4Cl is.
(A) double than that of NH4CI
(B) half than that of NH4CI
(C) same as that of NH4CI
(D) determined by the amount of solid NH4Cl
111 Acidity of BF3 can be explained on the basis of which of the following concent
(A) Arrhenius concept
(B) Lewis concept
(C) Bronsted-Lowry concept
(D) Bronsted-Lowry as well as Lewis concept
112 When some acid is added to water, the ionic product of water –
(A) changes with an increase in pH.
(B) changes with a decrease in pH.
(C) remains unchanged.
(D) becomes zero.
113 One litre of a buffer solution containing 0.01 M NH4CI and 0.1M NH4OH having pK4 of 5 has pH of-
(A) 9
(B) 10
(C) 4
(D) 6
114 If pH of solution is 5.2, then its pOH will be –
(A) 4.8
(B) 5.8
(C) 6.8
(D) 8.8
115 Which of the following solution acts as a buffer?
(A) HCl + NaCI
(B) NaOH + HCl
(C) CH3COOH + CH3COONa
(D) HCOOH + HCOONH4
116 The total pressure of a mixture of two gases is –
(A) The sum of partial pressure of each gas
(B) The difference in partial pressure of both the gases
(C) The product of partial pressure of both the gases
(D) The ratio of partial pressure of both the gases
117 In ideal gas equation PV = nRT, which one cannot be the numerical value of R?
(A) 8.314 x 107 erg mol<sup-1 K-1
(B) 8.314 J mol-1 K-1
(C) 8.314 Pa m3 moI-1 K-1
(D) 8.314 atm mol-1 K-1
118 A charge q is enclosed in a cube.The electric flux associated with one of the faces of is-
(A) q/∈0
(B) q/6∈-0
(C) 6q/∈-0
(D) ∈0/q
119 Three charges +4q, Q and q are placed on a straight line of lenght ℓ at points at di 0,ℓ/2 and ℓ respectively. What should be Q in order to make the net force on q to be
(A) -q
(B) -2q
(C) -q/2
(D) 4q
120 A charged oil drop is suspended in uniform field of 3 x 104 Vm-1 so that it neither rises The charge on the drop (take mass of the drop 9.9 x 10-15 kg and g ≃ 10
(A) 3.3 x 10-18C
(B) 3.2 x 10-18C
(C) 1.6 x 10-18C
(D) 4.8 x 10-18C