MDCAT Chemistry Past Papers MCQs

MDCAT Chemistry Past Papers MCQs (Solved 1–60)

Q.1 Which type of bonding is present in NH4Cl?
A) Ionic
B) Covalent
C) Coordinate covalent
D) All of these ✓

Q.2 When CuSO4 is electrolyzed in aqueous solution using copper electrodes, then the substance which deposits at the cathode is:
A) Copper metal ✓
B) Copper ions
C) Hydrogen
D) Oxygen

Q.3 Aldehydes can be synthesized by the oxidation of:
A) Primary alcohols ✓
B) Secondary alcohols
C) Organic acids
D) Inorganic acids

Q.4 The products of the fermentation of a sugar are ethanol and:
A) Water
B) Oxygen
C) Carbon dioxide ✓
D) Sulfur dioxide

Q.5 ____ serve as carriers of heredity from one generation to the other.
A) Lipids
B) Caseins
C) Formaldehydes
D) Nucleoproteins ✓

Q.6 ____ extraction is controlled by partition law.
A) Iodine
B) Benzoic acid
C) Solvent ✓
D) Stationery

Q.7 The process of effusion is best understood by ____ law.
A) Graham’s ✓
B) Charles’s
C) Boyle’s
D) None of these

Q.8 ____ has dipole moment.
A) CO ✓
B) CO2
C) Benzene
D) All of these

Q.9 ____ is used as catalyst in Haber’s process for NH3 gas manufacture.
A) Iron ✓
B) Carbon
C) Copper
D) Silver

Q.10 In many of its properties ____ is quite different from the other alkali metals.
A) Li ✓
B) Be
C) Na
D) K

Q.11 Which element forms long chains alternating with oxygen?
A) Carbon
B) Silicon ✓
C) Nitrogen
D) All of these

Q.12 The percentage of carbon in medium carbon steel is:
A) 0.7-1.5
B) 0.1-0.2
C) 0.2-0.7 ✓
D) 1.6-2.00

Q.13 Name the rare halogen among the following.
A) F
B) Cl
C) I
D) At ✓

Q.14 Which bond will break when electrophile attacks an alcohol?
A) O-H
B) C-O
C) Both A and B ✓
D) None of these

Q.15 The extent of un-saturation in a fat is expressed as its:
A) Acid number
B) Iodine number ✓
C) Saponification number
D) None of these

Q.16 The process of filtration is used to separate ____ particles from liquids.
A) Radial
B) Angular
C) Insoluble ✓
D) Soluble

Q.17 London forces are very significant in ____
A) Sulphur
B) Phosphorous
C) Argon ✓
D) Sugar

Q.18 Which of the following formation is endothermic reaction?
A) 2H2 + O2 → 2H2O
B) C + O2 → CO2
C) N2 + O2 → N2O2 ✓
D) None

Q.19 Name the partially miscible liquids from the following?
A) Alcohol-ether
B) Nicotine-water ✓
C) Benzene-water
D) Both A and B

Q.20 AlI3 is electrically a:
A) Conductor
B) Non-conductor
C) Semiconductor ✓
D) None

Q.21 p-block elements include groups:
A) IIIA–VIIA ✓
B) IA–IIA
C) Transition
D) None

Q.22 Concentrated nitric acid with tin gives:
A) NO
B) Meta stannic acid ✓
C) NH4NO2
D) None

Q.23 H2SO4 manufactures:
A) HCl & HNO3
B) H3PO4
C) Both ✓
D) None

Q.24 Waxy alkanes have:
A) ≤4C
B) 5–17C
C) ≥18C ✓
D) None

Q.25 Chloral hydrate from:
A) Acetaldehyde ✓
B) Formaldehyde
C) None
D) Both

Q.26 Water formed:
A) 10 ✓
B) 8
C) 6
D) 4

Q.27 Critical temp:
A) Solid
B) Liquid ✓
C) Gas
D) Iso

Q.28 Tetrahedral:
A) sp³ ✓
B) sp²
C) sp
D) All

Q.29 Osmotic pressure:
A) Obl
B) Frac
C) Colligative ✓
D) Auto

Q.30 Mg + H2 catalyst:
A) Dolomite
B) MgI2
C) Mg3N2
D) Epsom ✓

Q.31 Which element has the largest number of allotropic forms?
A) Phosphorous
B) Sulphur ✓
C) Oxygen
D) Both A & C

Q.32 With increase in number of unpaired electrons, paramagnetism:
A) Increases ✓
B) Decreases
C) Remains constant
D) Decreases then increases

Q.33 Which metal is commonly used to remove air bubbles from molten metals?
A) Aluminium ✓
B) Copper
C) Sodium
D) Calcium

Q.34 Which of the following bonds has minimum bond energy?
A) C-F
B) C-Cl
C) C-I ✓
D) C-Br

Q.35 Which of the following does not react with water?
A) Li
B) Na
C) Mg
D) Be ✓

Q.36 Al2O3(SiO2).2H2O is called:
A) Clay ✓
B) Talc
C) Asbestos
D) None of these

Q.37 CaO forms fertilizer slag by reacting with:
A) P2O5
B) Fe2O3
C) Silica ✓
D) FeO

Q.38 ____ is colorless volatile liquid at room temperature.
A) HCl
B) HF ✓
C) HI
D) HBr

Q.39 Hydrogen passed through phenol at 150°C in the presence of ____ catalyst gives cyclohexanol.
A) Tin
B) Nickel ✓
C) Iron
D) Sodium

Q.40 Ethanol-water is ____ mixture.
A) Azeotropic ✓
B) Ideal
C) Benedict’s
D) Aliphatic

Q.41 The mobile phase in paper chromatography is usually:
A) An organic liquid ✓
B) Sulphuric acid
C) Water
D) Silver nitrate

Q.42 The amount of heat absorbed by one mole of solid at 1 atm when it melts into liquid form is denoted by:
A) ∆Hv
B) ∆Hf
C) ∆Hi
D) ∆Hs ✓

Q.43 In synthetic fibres ____ bonding is responsible for tensile strength.
A) Nitrogen
B) Hydrogen ✓
C) Oxygen
D) None of these

Q.44 Boiling point of HF is ____ H2O.
A) Lower than ✓
B) Higher than
C) Equal to
D) Almost same as

Q.45 ____ is necessary for development of leaves and it tends to accumulate in leaves and bark.
A) NO2
B) Calcium ✓
C) Gypsum
D) Nitrogen

Q.46 Which of the following is pale yellow to reddish yellow in color?
A) Pb2O
B) PbO2
C) PbO ✓
D) 2PbCO3.Pb(OH)2

Q.47 In which of the following carbon is double bonded with itself?
A) Alkane
B) Ether
C) Alkene ✓
D) Alkyne

Q.48 In this process, higher hydrocarbons can be cracked at lower temperature and lower pressure.
A) Thermal cracking
B) Catalytic cracking ✓
C) Steam cracking
D) Reforming

Q.49 Acetic acid is called ____ acid.
A) Methanoic
B) Propanoic
C) Ethanoic ✓
D) Butanoic

Q.50 Na may be denoted by ____ electron configuration notation.
A) 1s² 2s¹
B) [Ar] 4s¹
C) [Ne] 3s¹ ✓
D) None of these

Q.51 Which is the best drying agent in desiccators?
A) KOH
B) Gypsum
C) CaCl2 ✓
D) Silica sand

Q.52 100 m³ gas → pressure becomes:
A) 6 atm
B) 4 atm
C) 2 atm ✓
D) 1 atm

Q.53 The crystals of ____ are ionic solids.
A) Sugar
B) Iron
C) Diamond
D) NaCl ✓

Q.54 Which material possesses the highest pH?
A) Soft drinks
B) Bananas
C) Milk of magnesia ✓
D) Sea water

Q.55 The electron present in a particular orbit ____ energy.
A) Releases
B) Does not radiate ✓
C) Absorbs
D) None

Q.56 Al2F2SiO4 is named as:
A) Gibbsite
B) Emerald
C) Bauxite
D) Cryolite ✓

Q.57 Name the oxide in which N has the highest oxidation number.
A) Nitrous oxide
B) Nitric oxide
C) Nitrogen peroxide
D) Nitrous anhydride ✓

Q.58 Sulphur has oxidation state of:
A) ±2
B) +4 and +6
C) None
D) Both A and B ✓

Q.59 CH3-O-CH3 is example of ____ isomerism.
A) Metamerism ✓
B) Functional group
C) Chain
D) Position

Q.60 ____ are product of reaction of an alcohol and aromatic bi-functional acids.
A) Acrylic resins
B) Polyester resins ✓
C) PVCs
D) Polyamide resins