MDCAT Chemistry Online Test With Answers

MDCAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The biggest source of acid rain is the oxide of. N S O C
2 Which one of the following is an example of co-polymer? Polyamide Polystyrene Polyvinyl acetate Polyvinyl chloride
3 Out of these which nitrogen base is NOT present in DNA? Adenine Guanine Uracil Thymine
4 Haemoglobin is a Genetic protein Building protein Transport protein Structural protein
5 Polymide is formed due to the condensation od hexane-dioic acid with Hexane-1, 5- diamine Hexane-1, 6 -diamine Hexane-1, 4- diamine Hexane-2, 5- diamine
6 One metabolite that fits on the enzyme surface and is converted to products is called. Co-factor Prosthetic group Isoenzyme Substrate
7 Which one of the following amino acids is basic in nature? Glycine Alanine Lysine Glutamic acid
8 Carboxylic acids are rather hard to reduce, which powerful reducing agent can be used to convert them to the corresponding primary alcohol. H<sub>2</sub>SO<sub>4</sub>/MgSO<sub>4</sub> V<sub>2</sub>O<sub>5</sub> LiAl H<sub>4</sub> K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>/H<sub>2</sub>SO<sub>4</sub>
9 Ka values of few organic acids are given.
Acid Ka value
CH3COOH 1.85 x 10-5
CCl2COOH 2.3 x 10-2
CHCl2 COOH 5.0 x 10-3
CH2OCOOH 1.3 x 10-3
The order of acid strength is.
 CCl<sub>2</sub>COOH &gt; CHCl<sub>2</sub> COOH &gt; CH<sub>2</sub>COOH . CH<sub>2</sub>COOH CH<sub>3</sub> COOH &gt; CHCl<sub>2</sub> COOH &gt; CCl<sub>2</sub> COOH &gt; CH<sub>2</sub>ClCOOH CHCl<sub>2</sub> COOH &gt; CH<sub>3</sub>COOH &gt; CCl<sub>3</sub>COOH &gt; CH<sub>2</sub>CLCOOH CCl<sub>2</sub>COOH &gt; CH<sub>3</sub>COOH &gt; CHCl<sub>2</sub> COOH . CH<sub>2</sub>ClCOOH
10 An organic acid 'z' reacts separately with sodium bicarbonate, sodium hydroxide and sodium carbonate. Which one of the following represent the structure of 'z'? HCOOC2H5 CH3-CH=CH2 CH3CH2OH H3C-CH2-COOH
11 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. n-bond of C and O Sigma bond of C and H Sigma bond of C and O Sigma bond of C and C
12 Which one of the following is also called silver mirror test? Fehlinig's solution test Iodoform test Tollen's reagent Benedict's solution tests
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. Calcium oxide Calcium chloride Calcium carbonate Carbon mono oxide
14 How will you distinguish between methanol and ethanol? By Lucas test By silver mirror test By oxidation By Iodoform test
15 Which one of the following is NOT able to denature the ethanol? Methanol Lactic Acid Pyridine Acetone
16 Which one of the following was uses as one of the earliest antiseptic and disinfectant? Phenol Ether Ethanol Methanol
17 Order of reactivity of alkenes with hydrogen halide is. HBr &gt; HI &gt; HCl HI &gt;HBr&gt;Hf Hf &gt; HI&gt;HCl HI &gt;HBr&gt;HCl
18 What is the percentage of nitrogen in NH3NO3? 65% 35% 20% 58%
19 Urea is the most widely used nitrogen fertilizers in Pakistan. Its composition is NH<sub>2</sub>CO N<sub>2</sub>H<sub>5</sub>CO<sub>2</sub> N<sub>2</sub>H<sub>4</sub>CO<sub>2</sub> N<sub>2</sub>H<sub>4</sub>CO
20 About 80% of ammonia is used for the production of Explosives Fertilizers Nylon Polymers
21 Electronic configuration of Gold [Au79] is [Xe] 4f<sup>14</sup>, 5d<sup>10</sup>, 6s<sup>1</sup> [Xe] 4f<sup>10</sup>, 5d<sup>10</sup>, 6s<sup>2</sup> [Xe] 4f<sup>14</sup>, 5d<sup>9</sup>, 6s<sup>2</sup> [Xe] 4f<sup>14</sup>, 5d<sup>10</sup>, 6s<sup>2</sup>
22 [Ti(H2O)6]+3 transmits Yellow and Red light Yellow and blue light Red and white light Red and blue light
23 Which one of the following gases is used as mixture for breathing by sea divers? Oxygen and nitrogen Nitrogen and Helium Helium and oxygen Helium and Hydrogen
24 Keeping in view the size of atoms, which order is correct? N&gt;C P &gt; Si Ar &gt; Cl Li &gt; Be
25 Which one of the following will have the smallest radius? Al<sup>+3</sup> Si<sup>+4</sup> Mg<sup>+2</sup> Na<sup>+2</sup>
26 When the change in concentration is 6 x 10-4 mol dm-3 and time for that change is 10 seconds the rate of reaction will be 6 x 10<sup>-3</sup> mol dm<sup>-3</sup> sec<sup>-1</sup> 6 x 10<sup>-4</sup> mol dm<sup>-3</sup> se<sup>-1</sup> 6 x 10<sup>-2</sup> mol dm<sup>-3</sup> sec<sup>-1</sup> 6 x 10<sup>-5</sup> mol dm<sup>-3</sup> sec<sup>-1</sup>
27 The half life of N2O5 at 0 oC is 24 minutes. How long will it take for sample of N2O5 to decay to 25% of its original concentration? 24 minutes 72 minutes 120 minutes 40 minutes
28 What is the correct relation between pH and pK? pH = PKa + log [acid/base] pH = Pka -log [acid/base] pH = pKa - log [base/acid] pH = pka -log [base/acid]
29 Given solution contains 16.0 g of CH3O, 92.0 G OF C2H5OH and 36 g of water. Which statement about mole fraction of the components is true? Mole fraction of CH3OH is highest among all components Mole fraction of C2H5OH and H2O is the same Mole fraction of CH3OH and C2H5OH is ame Mole fraction of H2O is the lowest among all
30 10.0 gram of glucose are dissolved in water to make 100 cm3 of its solution, its molarity is. 0.55 0.1 10 1
31 There are four orbitals s,p,d and f , which order is correct with respect to the increasing energy of the orbitals? 4s &lt;4p&lt;4d&lt;4f 4s&lt;4f&lt;4p&lt;4d 4p&lt;4s&lt;4f&lt;4d 4f&lt;4s&lt;4d&lt;4p
32 Which one of the following pairs has the same electronic configuration s possessed by neon (Ne-10)? Na+, Cl- K+ ,Cl- Na+, Mg2+ Na+, F-
33 If the volume of a gas collected at a temperature of 600 oC and pressure of 1.05 x 105Nm-2 is 60 dm3, what would be the volume of gas at STP.(P =1.01 X 103 Nm-2,T= 273 K)? 25 Cm3 75 cm3 100 cm3 51 cm3
34 With the help of spectral data given calculate the mass of Neon and encircle the best option. 22.18 amu 21,18 amu 20.18 amu 22.20 amu
35 How many moles of sodium are present in 0.1 g of sodium? 4.3 x 10-1 4.03 x 10-1 4.01 x 10-2 4.3 x 10-2
36 The gas which is mainly produced in landfills from the waste is. CH4 CO2 SO2 Cl2
37 Ozone concentration is measured in Debye units Dupont units Debacle units Dobson units
38 In laboratory experiment an unknown compound was added in test tube containing iodine, the colour became intense blue, what could be the unknown compound. Cellulose Raffinose Ribose Starch
39 In the woody parts of trees, the % age of cellulose is. 50% 10% 30% 100%
40 Which one of the following nitrogen base is NOT present in DNA. Adenine Guanine Uracil Cytosine
41 Which one of the following is an exact composition of a carbohydrates? Carbon and hydrogen Carbon and oxygen Carbon , hydrogen and oxygen Hydrogen and oxygen
42 Which one of the following polymer is called as Nylon 6,67 Polyester Polyvinyl chloride Polyemide Polyvinyl acetate
43 When acid is added to an amino acid, which one of the following will act as a base. NH3- COO- H+ R group
44 In the formation of Zwitter ion which one of the following donates the proton? COOH NH2 CH2COO- OH-
45 Which one of the following reaction of carboxylic acid is reversible. Esterification Salt formation Reaction with PCl5 Reaction with SOCl2
46 Which one of the following test is given by both aldehyde and ketone? Silver mirror test Fehling's solution test 2,4 DNPH test Benedict's solution test
47 What mass of NaOH is present in 0.5 mol of sodium hydroxide? 40 gm 2.5 gm 15 gm 20 gm
48 Freezing point will also be defined as that temperature at which its solid and liquid phases have the same. Concentration Ratio between the particles Vapour pressure Attraction between the phases
49 The maximum number of electron in electronic configuration can be calculated by using formula. 2l+1 2n<sup>2</sup> +2 2n<sup>2</sup> 2n<sup>2</sup>+1
50 Number of neutrons in 66 Zn will be
30

 30 35 38 36
51 Electrical conductivity of graphite is greater in one direction that in other due to Isomorphism Cleavage plane Anisotropy Symmetry
52 London dispersion forces are the only forces present among the Molecules of H2O in liquid state Molecules of HCl gas atoms of helium in gaseous state at high temperature Molecules of solid chlorine
53 The number of moles of CO2 which contain 8.00 gm of oxygen is. 0.75 1.50 0.25 1.00
54 The substance for the separation of isotopes is firstly converted into the Neutral state Free state Vapour state Charged state
55 The energy from ultraviolet light is sufficient to break the_____ bonds in CCl,F Cl-Cl C-Cl Cl-F C-F
56 ________ is the major source of acid deposition in atmosphere. SiO2 CO2 SO3 Al2O3
57 SO3 , formed in contact process is absorbed in ____________% H2SO4. 90 80 98 89
58 Which one of the following is the main function of DNA. Making of problem Making of among Breaking of ribose sugar Carries genetic material
59 The amino linkage in Nylon -6,6 has the structure. -NH2 -CO,O2 -NH-CO- -NH-O-CO-
60 IUPAC name of alanine is. 2-aminopropanoic acid 2- aminoethanoic acid 2-aminobutane-1,4 choleric acid 2-aminobutanoic acid
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