Solved Past Papers MCQs of MDCAT for the preparation of Medical and Dental College Admission Test and other medical tests.
Q.51 Freezing point will also be defined as that temperature at which its solid and liquid phases have the same:
A) Concentration C) Vapour pressure
B) Ratio between the particles D) Attraction between the phases
Q.52 What mass of NaOH is present in 0.5 mol of sodium hydroxide?
A) 40 gm C) 15 gm
B) 2.5 gm D) 20 gm
Q.53 Study the following redox reaction:
10Clˉ +16H+ + 2MnO4ˉ→ 5Cl2 + 2Mn+2 + 8H2O
A) Manganese is oxidized from +7 to +2 C) Chlorine is reduced from zero to -1
B) Chlorine ions are reduced from -1 to zero D) Manganese is reduced from +7 to +2
Q.54 Human blood maintains its pH between:
A) 6.50 – 7.00 C) 7.50 – 7.55
B) 7.20 – 7.25 D) 7.35 – 7.40
Q.55 Value of Ksp for PbSO4 system at 25 °C is equal to:
A) 1.6 x 10-5 mol2dm-6 C) 1.6 x 10-8 mol2dm-6
B) 1.6 x 10-6 mol2dm-6 D) 1.6 x 10-7 mol2dm-6
Q.56 2A + B → Product
If the reactant ‘B’ is in excess, the order of reaction with respect to ‘A’ in given rate law, Rate = k[A]2[B] is:
A) 2nd order reaction C) Pseudo 1st order reaction
B) 1st order reaction D) 3rd order reaction
Q.57 The rate constant ‘k’ is 0.693 min-1. The half-life for the 1st order reaction will be:
A) 1 min C) 0.693 min
B) 2 min D) 4 min
Q.58 Melting points of group II-A elements are higher than those of group I-A because:
A) Atoms of II-A elements have smaller size C) Atoms of II-A elements provide two binding electrons
B) II-A elements are more reactive D) I-A elements have smaller atomic radius
Q.59 The ionic radius of fluoride ion is:
A) 72 pm C) 136 pm
B) 95 pm D) 157 pm
Q.60 2NaOH(aq) + Cl2(g) NaCl + NaClO + H2O proceed at:
A) 500 °C C) -10 °C
B) 200 °C D) 15 °C
Q.61 Which halogen molecule ‘X2’ has lowest dissociation energy?
A) Cl2 C) I2
B) Br2 D) F2
Q.62 The anomalous electronic configuration shown by chromium and copper among 3-d series of elements is due to:
A) Colour of ions of these metals C) Stability associated with this configuration
B) Variable oxidation states of metals D) Complex formation tendency of metals
Q.63 Which element of 3d series of periodic table shows the electronic configuration of 3d6, 4s2?
A) Copper C) Zinc
B) Cobalt D) Nickel
Q.64 The %age of nitrogen in ammonium nitrate is:
A) 46% C) 33%
B) 82% D) 13%
Q.65 Which one of the following is anhydride of sulphuric acid?
A) Sulphur (II) oxide C) Iron pyrite
B) Sulphur (VI) oxide D) Sulphur (VI) oxide
Q.66 During contact process of H2SO4 synthesis, the following reaction occurs:
2SO2(g) + O2(g) ↔2SO3(g) ΔH = -96 kJmol-1
Which step is used to increase the yield of SO3?
A) Temperature is raised to very high degree C) Both temperature and pressure are kept very low
B) SO3 formed is removed very quickly D) An excess of air is used to drive the equilibrium to the right side
Q.67 Synthesis of ammonia by Haber’s process is a reversible reaction. What should be done to increase the yield of ammonia in the following reaction?
N2(g) + 3H2(g) ↔2NH3(g) ΔH = -92 kJmol-1
A) Pressure should be decreased C) Pressure should be increased
B) Ammonia should remain in reaction mixture D) Concentration of nitrogen should be decreased
Q.68 Which one of the following pairs can be cis-trans isomer to each other?
A) CHCl=CCl2 and CH2=CH2 C) CH3-CH=CH-CH3 and H3C-CH=CH-CH3
B) CHCl=CH2 and CH2=CHCl D) CH3-CH3 and CH2=CH2
Q.69 Consider the reaction given below:
CH3CH2Br KOH →alcohol H2C=CH2 + HBr
Mechanism followed by the reaction is:
A) E2 C) SN1
B) E1 D) SN2
Q.70 The average bond energy of C-Br is:
A) 228 kJmol-1 C) 250 kJmol-1
B) 200 kJmol-1 D) 290 kJmol-1
Q.71 Which one of the following is NOT a nucleophile:
A) NH2ˉ C) BF3
B) H2O D) CH3ˉ
Q.72 Which one of the following is an appropriate indication of positive iodoform test?
A) Formation of H2O C) Brick red precipitate
B) Release of H2 gas D) Yellow crystal
Q.73 Which one of the following test is given by both aldehyde and ketone?
A) Silver mirror test C) 2, 4 DNPH test
B) Fehling’s solution test D) Benedict’s solution test
Q.74 CH3COOH + CH3CH2OH ↔CH3COOC2H5 + H2O
Which one of the following will act as a catalyst in above reaction?
A) HNO3 C) Acidified potassium dichromate
B) H2SO4 D) SOCl2
Q.75 CH3COOH + PCl5 → ?
Which one of the following options shows the products of above reaction?
A) POCl2 + CH3COCl2 + HCl C) CH3COCl + POCl2 + HCl
B) POCl3 + CH3COCl2 + H2 D) POCl3 + CH3COCl + HCl
Q.76 Which one of the following reaction of carboxylic acid is reversible?
A) Esterification C) Reaction with PCl5
B) Salt formation D) Reaction with SOCl2
READ MORE:
- Solved Past Papers MCQs of MDCAT 1
- Solved Past Papers MCQs of MDCAT 3
- Solved Past Papers MCQs of MDCAT 4
