You are currently viewing NEET (UG) – 2011 Main Chemistry Previous Year Questions

NEET (UG) – 2011 Main Chemistry Previous Year Questions

91.

Chemistry formula

(1) (A) – (i)            (B) – (ii)       (C) – (iii)      (D) – (iv)

(2) (A) – (iv)          (B) – (iii)      (C) – (ii)       (D) – (i)

(3) (A) – (iii)          (B) – (iv)      (C) – (i)        (D) – (ii)

(4) (A) – (ii)           (B) – (iii)      (C) – (iv)      (D) – (i)

92. Which of the following statements is incorrect?

(1) Aluminium reacts with excess NaOH to give Al(OH)3

(2) NaHCO3 on heating gives Na2CO3

(3) Pure sodium metal dissolves in liquid ammonia to give blue solution

(4) NaOH reacts with glass to give sodium silicate

93. Which of the statements about “Denaturation” given below are correct?

Statements :

(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein

(b) Denaturation leads to the conversion of double strand of DNA into single strand

(c) Denaturation affects primary structure which gets distorted

Options

(1) (a) and (b)                  (2) (a), (b) and (c)

(3) (b) and (c)                  (4) (a) and (c)

94.

Chemistry formula

(1) trans-3-iodo-4-chloro-3-pentene

(2) cis-3-chloro-3-iodo-2-pentene

(3) trans-2-chloro-3-iodo-2-pentene

(4) cis-3-iodo-4-chloro-3-pentene

95. Which of the following oxide is amphoteric?

(1) SiO2                 (2) CO2

(3) SnO2                (4) CaO

 96. Which of the following compounds undergoes nucleophilic substitution reaction most easily?

(1) Chemistry formula

(2) Chemistry formula

(3) Chemistry formula

(4) Chemistry formula

97. A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar what will happen to the volume of the bubble?

(1) Volume will become smaller by a factor of 0.70

(2) Volume will become greater by a factor of 2.5

(3) Volume will become greater by a factor of 1.6

(4) Volume will become greater by a factor of 1.1

98. An organic compound ‘A’ on treatment with NH3 gives ‘B’ which on heating gives ‘C’ when treated presence of KOH produces ethylamine. Compound with Br in the ‘A’ is

(1) Chemistry formula

(2) Chemistry formula

(3) Chemistry formula

(4) Chemistry formula

99.

Chemistry formula

(1) – 325 kJ/mol                        (2) 325 kJ/mol

(3) 525 kJ/mol                           (4) – 175 kJ/mol

100. A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86°C/m, the freezing point of the solution will be

(1) – 0.36°C                              (2) – 0.24°C

(3) – 0.18°C                              (4) – 0.54°C

101. The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

(1) CaO(s) + SiO2(s) → CaSiO3(s)

(2) 2C(s) + O2(g) → 2CO(g)

(3) Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

(4) CaCO3(s) → CaO(s) + CO2(g)

102. In qualitative analysis, the metals of group I can be separated from other ions by precipitating them as chloride salts. A solution initially contains Ag+ and Pb2+ at a concentration is 0.10 M. Aqueous HCl is added to this solution until the Cl concentration is 0.10 M. What will the concentration of Ag+ and Pb2+ be at equilibrium?

(Ksp for AgCl = 1.8 × 10–10, Ksp for PbCl2 = 1.7 × 10–5)

(1) [Ag+] = 1.8 × 10–9 M [Pb2+] = 1.7 × 10–3 M

(2) [Ag+] = 1.8 × 10–11 M [Pb2+] = 1.7 × 10–4 M

(3) [Ag+] = 1.8 × 10–7 M [Pb2+] = 1.7 × 10–6 M

(4) [Ag+] = 1.8 × 10–11 M [Pb2+] = 8.5 × 10–5 M

103. Which of the following structures is the most preferred and hence of lowest energy for SO3?

(1) Chemistry formula

(2) Chemistry formula

(3) Chemistry formula

(4) Chemistry formula

104. The unit of rate constant for a zero order reaction is

(1) L2 mol–2 s–1                (2) s–1

(3) mol L–1 s–1                 (4) L mol–1 s–1

105. A solution contains Fe2+, Fe3+ and I ions. This solution was treated with iodine at 35°C. E° for Fe3+/Fe2+ is +0.77 V and E° for I2/2I= 0.536 V. The favourable redox reaction is

(1) I will be oxidised to I2

(2) Fe2+ will be oxidised to Fe3+

(3) I2 will be reduced to I

(4) There will be no redox reaction

106. 200 mL of an aqueous solution of a protein contains its 1.26 g. The Osmotic pressure of this solution at 300 K is found to be 2.57 × 10–3 bar. The molar mass of protein will be (R = 0.083 L bar mol–1 K–1)

(1) 31011 g mol–1            (2) 61038 g mol–1

(3) 51022 g mol–1            (4) 122044 g mol–1

107.