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NEET (UG) – 2011 Main Chemistry Previous Year Questions

91.

(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.


(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)

(2)

(3)

(4)

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)

(2)

(3)

(4)

99.


(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