MDCAT chemistry mcqs 2009 entry test of UHS

CHEMISTRY
Q.61 Which of the following is an exothermic reaction?  A) H+(aq) + OH−(aq)                     H2O(l)   C)
1 2 H2(g)                H(g)  B) Na(g)                 Na+(g) + 1e−   D) 1 2 Cl2(g)               Cl(g)

Q.62 The rate equation determined experimentally for this reaction: (CH3)3―C―Br + H2O                      (CH3)3―C―OH + HBr  Is, Rate = k[(CH3)3CBr]  Hence it is which of the follwing?  A) Fractional Order     C) First Order  B) Pseudo First Order     D) Second Order

Q.63 Equilibrium constant Kc for
H2O                    H+ + OH−
 Can be written as follows:  A) Kc = H+ [H2O][OH-]     C) Kc = [OH-]H+ [H2O]   
 B) Kc = [OH-] H+[OH-]     D) Kc = [H2O] H+[OH-]    Q.64 The protonation of carboxylic acid is: 
A)
CH3 C OH
O
+ H+ CH3 C OH O+ H
 C) CH3 C OH
O
+ H+  CH3 C OH2 + O

   
 B)
CH3 C OH
O
+ H+  CH3 CH OH O+H
 D) CH3 C OH
O
+ H+  CH3 C OH O+ H


Q.65 Each molecule of haemoglobin is made up of nearly:  A) 11000 atoms     C) 10000 atoms  B) 6600 atoms     D) 6800 atoms

Q.66 A limiting reactant is the one which: A) Is mostly a cheaper substance and taken in larger quantity B) Is consumed earlier and controls the amount of product formed in a chemical reaction C) Gives greatest number of moles of products D) Is left behind after the completion of reaction

Q.67 During isotopic analysis, the pressure of the vapours of the ions maintained in the ionization chamber of mass spectrometer is:  A) Around 10-7 torr     C) 1 torr  B) Around 10-3 torr     D) 10-7 torr

Q.68 The acid which can be purified by the sublimation is:  A) Acetic Acid      C) Oxalic Acid  B) Benzoic Acid     D) Citric Acid

Q.69 Paper chromatography is used for:  A) Elemental Analysis     C) Qualitative Analysis  B) Industrial Purification    D) Structural Analysis

Q.70 In the process of respiration there is application of:  A) Dalton’s Law     C) Boyle’s Law  C) Charles’s Law     D) Graham’s Law
Page 8 of 18 Q.71 The formula of acrylonitrile is:  A) CH3=CH―CN     C) CH3―CH2―CN  B) CH3―CH2―CH2―CN    D) CH3―CN

Q.72 During nitration of benzene the active nitrating agent is:  A) NO2−      D) NO3  B) HNO2      D) NO2+

Q.73 Which compound is the most reactive one?  A) Ethyne      C) Benzene  B) Ethane      D) Ethene

Q.74 Grignard reagents are prepared by the reaction of magnesium metal with alkyl halides in the presence of:  A) Dry Ether      C) Alcohol  B) CS2      D) CCl4

Q.75 When n-butyl magnesium iodide is treated with water, the product is:  A) n-butane       C) Propane  B) Iso-butane      D) Alcohol

Q.76 CO + 2H2       
X Y
  CH3OH
 X and Y are:  A) ZnO + Al2O3 and 450 °C: 200 atm   C) Al2O3 + Cr2O3 and 200 °C: 200 atm  B) ZnO + Cr2O3 and 450 °C: 200 atm   D) ZnO + Cr2O3 and 450 °C: 200 atm

Q.77 Phenol reacts with concentrated H2SO4 to give:  A) ortho hydroxy benzene sulphonic acid  C) ortho and para hydroxy benzene sulphonic acid  B) meta hydroxy benzene sulphonic acid  D) para hydroxy benzene sulphonic acid

Q.78 Phenol can be distinguished from alcohol by adding:  A) Br2/H2O      C) FeSO4  B) Cl2/H2O      D) FeCl3

Q.79 In the conversion of ethylene into acetaldehyde, cupric chloride acts as:  A) Initiator       C) Catalyst  B) Promoter      D) Reactant

Q.80 When acetone is heated in the presence of K2Cr2O7/H2SO4, the products formed are;  A) Maleic Acid and Fumaric Acid   C) Formic Acid and Oxalic Acid  B) Acetic Acid and Formic Acid    D) Oxalic Acid and Acetic Acid

Q.81 Which acid is used in the manufacture of plastics?  A) Carbolic Acid     C) Carbonic Acid  B) Acetic Acid      D) Oxalic Acid

Q.82 Which of the following compounds will react with Tollen’s Reagent?
 A) CH3 C OH
O
     C) CH3 C H
O

 B) CH3 C CH2 CH3
O
     D) CH3 C CH3
O


Q.83 In conjugated protein molecules, the protein is attached or conjugated to some non-protein group which are called:  A) Prosthetic Group     C) Hydrogen Bonding  C) Aldehyde Group     D) Peptide Linkage

Q.84 Micronutrients are required in quantity ranging from:  A) 6 – 200 g per acre     C) 4 – 40 g per acre  B) 6 – 200 kg per acre    D) 4 – 40 kg per acre
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Q.85 Potassium fertilizers are especially useful for:  A) Mango      C) Wheat  B) Tobacco       D) Rice

Q.86 The yellowish colour of photochemical smog is due to the presence of:  A) Nitrogen dioxide     C) Nitrous oxide  B) Dinitrogen trioxide     D) Nitric oxide

Q.87 The incarnation process can reduce the volume of the water by:  A) One half      C) One third  B) Not affected     D) Two third

Q.88 __________% of the known universe is in the plasma state.  A) 30       C) 50  B) 99       D) 80

Q.89 Absolute zero is unattainable. Current attempts have resulted in temperature as low as:  A) 10-4 K      C) 10-1 K  B) 10-2 K      D) 10-5 K

Q.90 Electron gas theory was proposed to explain the bonding in ____________ solids:  A) Molecular      C) Covalent  B) Ionic       D) Metallic

Q.91 In proteins, there are on the average _________ amino acid units for each turn in helix:  A) 25       C) 21  B) 27       D) 23

Q.92 In atomic particles: A) Mass of neutron is almost equal to mass of electron B) e/m of a proton is almost equal to e/m of electron C) Mass of proton is almost equal to mass of electron D) Charge of proton is almost equal to charge of electron

Q.93 The extent of bonding of a light ray after passing through prism depends upon:  A) Wavelength of photons    C) Energy of photons  B) Wave number of photons    D) Frequency of photons

Q.94 Splitting of spectral lines in closely spaced lines in presence of magnetic field is called:  A) Stark Effect     C) Photoelectric Effect  B) Zeeman Effect     D) Compton Effect

Q.95 A bond is not formed: A) When both forces become equal to each other  C) When attraction forces dominate repulsive forces  B) When repulsive forces become equal to zero D) When repulsive forces dominate attraction forces

Q.96 If the electronegativity difference between bonded atoms is zero, the bond between the two atoms is:  A) Polar      C) Non-polar  B) Partially Ionic     D) Both B and C

Q.97 VSEPR theory helps in explaining:  A) Attraction between atoms    C) Nature of bond  B) Size of molecule     D) Shape of molecule

Q.98 Which of the following formation is an endothermic reaction?  A) C(g) + O2(g)   CO2   C) 2H2O(l)  2H2(g) + O2(g)   B) N2(g) + 3H2(g)  2NH3(g)   D) None of the above


Q.99 Solubility of KClO3 can be decreased bin H2O by:  A) Removing K+ ions from the solution   C) Adding KCl from outside  B) Removing ClO3-1 ions from the solution  D) Adding NaNO3 from outside
Page 10 of 18 Q.100 36 g of HCl dissolves in 100 g of solution. The density of HCl is 1.19 gcm-3. The molar mass of the HCl solution will be:  A) 36.5 g/mol      C) 38.0 g/mol  B) 100 g/mol      D) 11.73 g/mol

Q.101 The heat of hydration decreases with the increase in:  A) Number of neutrons    C) Size of atomic radii  B) Size of cations     D) Number of electrons

Q.102 Stronger the oxidizing agent, greater is the:  A) Redox Potential     C) Oxidation Potential  B) emf of the cell     D) Reduction Potential

Q.103 The emf produced by Galvanic Cell is known as:  A) Redox Potential     C) Cell Potential  B) Oxidation Potential     D) None of the above

Q.104 In nickel-cadmium battery, the cathode is composed of:  A) Cd       C) Ni  B) Ni(OH)2      D) NiO2

Q.105 Concentrated sugar solution undergoes hydrolysis into glucose and fructose by enzyme called:  A) Zymase      C) Cellulose  B) Invertase      D) Urease

Q.106 In Modern Periodic Table, the elements in Group II-B are:  A) Zn, Cd, Pb      C) Zn, Cd, Ba  B) Zn, Cd, Hg      D) Zn, Cd, Bi

Q.107 Hydrogen loses an electron to form:  A) H+       C) H  B) H2−2      D) H−

Q.108 Which metal occurs as skeletal material in egg shell?  A) Calcium      C) Beryllium  B) Barium      D) Strontium

Q.109 At which condition are hydrides of alkaline earth metals formed:  A) At high pressure     C) At high temperature  B) At room temperature    D) None of the above

Q.110 Which metal carbide is formed readily by the direct reaction?  A) Rubidium      C) Sodium  B) Potassium      D) Lithium

Q.111 Asbestos is hydrated _________ magnesium silicate.  A) Calcium      C) Barium  B) Aluminium      D) Carbon

Q.112 Formula of lead suboxide is:  A) Pb2O3      C) PbO  B) Pb2O      D) Pb3O4

Q.113 Phosphine can be produced by __________ of phosphorous acid.  A) Hydration      C) Oxidation  B) Hydrolysis      D) Reduction

Q.114 Which Noble Gas is used in bacterial lamps?  A) Xenon      C) Argon  B) Radon      D) Krypton


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Q.115 The most durable metal plating on iron to protect against corrosion is:   A) Tin plating      C) Nickel plating  D) Zinc plating     D) Copper plating

Q.116 Colour of the transition metal ions/ compounds is due to the electrons present in:  A) d-orbital      C) p-orbital  B) s-orbital      D) None of the above

Q.117 Chromyl Chloride Test is performed to confirm:  A) Cl− ions      C) PO4−3 ions  B) SO4−2 ions      D) Cr+3 ions

Q.118 Linear shape is associated with set of hybrid orbitals?  A) sp2       C) sp3  B) dsp2      D) sp

Q.119 Which one of the following compounds show cis-trans isomerism?  A) 1-butene      C) 1-bromo-2-chloropropane  B) 1-hexene      D) Propene 

Q.120 CH3―CH2―MgBr + H2O    + X

 Where ‘X’ is: A) Propane      C) Methane B) Butane      D) Ethane