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NEET (UG) – 2014 Chemistry Previous Year

Q.46 What is the maximum number of orbitals that can be identified with the following quantum numbers n = 3, l = l, ml = 0

(1) 1                                (2) 2

(3) 3                                (4) 4

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Q.47 Calculate the energy in joule corresponding to light of wavelength 45 nm: (Planck constant h = 6.63 × 1034 Js, speed of light c = 3 × 108 ms–1)

(1) 6.67 × 1015                           (2) 6.67 × 1011

(3) 4.42 × 10–15                         (4) 4.42 × 10–18

Q.48 Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27ºC in identical conditions. The ratio of the volumes of gases H2 : O2 : methane would be:

(1) 8 : 16 : 1                              (2) 16 : 8 : 1

(3) 16 : 1 : 2                              (4) 8 : 1 : 2

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Q.49 If a is the length of the side of a cube, the distance between the body centred atom and one corner atom in the cube will be:

(1) 2/√3 a                         (2) 4/√3a

(3) √3/4 a                         (4) √3/2a

Q.50 Which property of colloids is not dependent on the charge on colloidal particles ?

(1) Coagulation                          (2) Electrophoresis

(3) Electro-osmosis                    (4) Tyndall effect

Q.51 Which of the following salts will give highest pH in water ?

(1) KCl                            (2) NaCl

(3) Na2CO3                      (4) CuSO4

Q.52 Of the following 0.10m aqueous solutions, which one will exhibit the largest freezing point depression ?

(1) KCl                            (2) C6H12O6

(3) Al2(SO4)3                   (4) K2SO4

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Q.53 When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P., the moles of HCl(g) formed is equal to:

(1) 1 mole of HCl(g)                 (2) 2 mole of HCl(g)

(3) 0.5 mol of HCl(g)                (4) 1.5 mol of HCl(g)

Q.54 When 0.1 mol MnO4−2 is oxidized the quantity of electricity required to completely oxidize  MnO4–2 to  MnO4 is:

(1) 96500 C                               (2) 2 × 96500 C

(3) 9650 C                                (4) 96.50 C

Q.55 Using the Gibbs energy change, ΔGº = + 63.3 kJ, for the following reaction, Ag2CO3(s) 2Ag+(aq) + CO32− (aq)

The Ksp of Ag2CO3(s) in water at 25ºC is:   (R = 8.314 J K–1 mol–1)

(1) 3.2 × 10–26                 (2) 8.0 × 10–12

(3) 2.9 × 10–3                   (4) 7.9 × 10–2

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Q.56 The weight of silver (at. wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be:

(1) 5.4 g                          (2) 10.8 g

(3) 54.0 g                        (4) 108.0 g

Q.57 Which of the following statements is correct for the spontaneous adsorption of a gas ?

(1) ΔS is negative and, therefore, ΔH should be highly positive.

(2) ΔS is negative and therefore, ΔH should be highly negative

(3) ΔS is positive and, therefore, ΔH should be negative

(4) ΔS is positive and, therefore, ΔH should also be highly positive.

Q.58 For the reversible reaction:

N2(g) + 3H2(g) 2NH3(g) + heat

The equilibrium shifts in forward direction:

(1) by increasing the concentration of NH3(g)

(2) by decreasing the pressure

(3) by decreasing the concentrations of N2(g) and H2(g)

(4) by increasing pressure and decreasing temperature

Q.59 For the reaction: X2O4(l) → 2XO2(g)

ΔU = 2.1 k cal, ΔS = 20 cal K–1 at 300 K Hence, ΔG is:

(1) 2.7 k cal                               (2) – 2.7 k cal

(3) 9.3 k cal                               (4) – 9.3 k cal

Q.60 For a given exothermic reaction, KP and K’P are the equilibrium constant at temperatures T1 and T2, respectively. Assuming that heat of reaction is constant in temperature range between T1 and T2, it is readily observed that-

(1) KP > K’P                      (2) KP < K’P

(3) KP = K’P                      (4) KP = 1/ K’P

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Q.61 Which of the following orders of ionic radii is correctly represented ?

(1) H > H+ > H                         (2) Na+ > F > O2–

(3) F > O2– > Na+                     (4) Al3+ > Mg2+ > N3–

Q.62 1.0 g of magnesium is burnt with 0.56g O2 in a closed vessel. Which reactant is left in excess and how much ?

(At. wt. Mg = 24; O = 16)

(1) Mg, 0.16g                            (2) O2, 0.16 g

(3) Mg, 0.44 g                           (4) O2, 0.28 g

Q.63 The pair of compounds that can exist together is:

(1) FeCl3, SnCl2               (2) HgCl2, SnCl2

(3) FeCl2, SnCl2               (4) FeCl3, KI

Q.64 Be2+ is isoelectronic with which of the following ions ?

(1) H+          (2) Li+          (3) Na+         (4) Mg2+

Q.65 Which of the following molecules has the maximum dipole moment ?

(1) CO2        (2) CH4        (3) NH3       (4) NF3