Paper no.3 CHEMISTRY

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Created on By buzzerkings

MDCAT Chemistry Paper 3

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1.Electronic configuration of Gold [Au79] is:

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2.About 80% of ammonia is used for the production

 

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3.Urea is the most widely used nitrogen fertilizer in Pakistan. Its composition Is

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4.During the manufacture of aitric acid, nitric oxide is oxidized to nitrogen dioxide. This reaction is given as: 

2NO(g)+ O2(g) ⇌ 2NO2(g) 

H= –114 kJ/mol According to Le Chatelier's Principle: 

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5.What is the percentage of nitrogen in NH3NO3?

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6.Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring? 

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7.Order of reactivity of hydrogen halides with alkenes is:

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8.The given three hydrocarbons are Benzene, Naphthalene and Anthracene:

Benzene

Naphthalene

Anthracene

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9.The IUPAC name of the given compound is: 

         CH3

         |

H3C-CH-CH2-Cl

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10.Which one of the following was used as one of the earliest antiseptic and disinfectant?

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11.Which one of the following is NOT able to denature the ethanol?

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12.How will you distinguish between methanol and ethanol?

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13.To produce absolute alcohol (100%) from rectified spirit (95.6% alcohol), the remaining 4.4% water must be removed by a drying agent such as:

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14.Which one of the following is also called silver mirror test? 

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15.Both aldehydes and ketones are planer to the neighborhoods of carbonyl (C=O) group. Which one of the following bonds is distorted towards the oxygen atoms?

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16.

       1        3     2     1

  CH3-CH-CH-COOH                  

            |         |

          CH3   CH3

which one is α-carbon atom?

 

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17.The specific substances (metabolite) that fits on the enzyme surface and is converted to products is called:

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18.Polyamide is formed due to the condensation of hexane-dioic acid with:

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19.Haemoglobin is a: 

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20.Out of this which nitrogen base is NOT present in DNA?

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21.Which one of the following is an example of co-polymer?

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22.The biggest source of acid rain is the oxide of: 

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23.Burning of which one of the following waste is considered as useful industrial fuel or to produce electricity: 

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24.Standard enthalpy of combustion of graphite at 25°C is -393.51 kJ mol-1 and that of diamond is -395.41 kJ mol-1.

The enthalpy change for graphite is:

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25. 10.0 grams of glucose are dissolved in water to make 100 cm3 of its solution, its molarity is: 

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26.Given solution contains 16.0g of CH3OH, 92.0 g of
C2H5OH and 36 g of water. Which statement about
mole fraction of the components is true?

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27.Study the following facts:

ZnZn+2 +2e–     E°=+0.76 V

CuCu+2 +2e–      E°= -0.34 V 

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28.Keeping in mind the electrode potential, which one of the following reactions is feasible? 

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29.What is the correct relation between pH and pKa?

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30.In the formation of Zwitter ion which one of the following donates the proton?

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