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Chemistry- MDCAT

Chemistry in MDCAT assesses essential chemical principles for medical fields. It is a core component of the standardised test for admission to Pakistani medical and dental colleges. The section evaluates understanding of organic, inorganic, and physical chemistry relevant to biological sciences.

1 / 100

According to Le Chatelier's Principle, if the temperature is increased for an exothermic reaction at equilibrium, the equilibrium will shift:

2 / 100

The complex ion [CoF₆]³⁻ is paramagnetic. The hybridization of cobalt in this complex is:

3 / 100

Which quantum number defines the shape of an orbital?

4 / 100

The process of a solid changing directly into a gas is called:

5 / 100

 The mass of one mole of electrons is approximately:

6 / 100

 In a face-centered cubic lattice, a unit cell is shared by how many unit cells?

7 / 100

 The order of stability of the following carbocations is:
(I) (CH₃)₃C⁺
(II) CH₃-CH₂⁺
(III) (CH₃)₂CH⁺

8 / 100

The number of isomers possible for C₄H₈ (excluding stereoisomers) is:

9 / 100

 The symbol 'Na' represents the element:

10 / 100

In the decomposition of KClO₃ to KCl and O₂, 0.1 moles of KClO₃ produces how many grams of O₂? (O=16)

11 / 100

The oxidation state of sulfur in H₂SO₄ is:

12 / 100

 Which hydrocarbon undergoes substitution reactions readily?

13 / 100

The pH of 0.01 M CH₃COOH solution (Ka = 1.8 × 10⁻⁵) is approximately:

14 / 100

The number of isomers possible for C₄H₁₀O (alcohols) is:

15 / 100

The osmotic pressure of a 0.1 M solution of a non-electrolyte at 27°C (R=0.0821 L.atm/mol.K) is:

16 / 100

Which sub-shell has the lowest energy?

17 / 100

The reaction CH₃COOH + C₂H₅OH ⇌ CH₃COOC₂H₅ + H₂O is an example of:

18 / 100

The crystal structure of NaCl is:

19 / 100

The E° values for Fe³⁺/Fe²⁺ and I₂/I⁻ are +0.77 V and +0.54 V respectively. The feasibility of the reaction 2Fe³⁺ + 2I⁻ → 2Fe²⁺ + I₂ is:

20 / 100

 The catalyst used in the Haber process for ammonia synthesis is:

21 / 100

In a face-centered cubic (FCC) crystal lattice, the number of atoms per unit cell is:

22 / 100

Which halogen exists as a liquid at room temperature?

23 / 100

The rate of a chemical reaction generally:

24 / 100

What is the charge on a proton?

25 / 100

The process used for the purification of copper is:

26 / 100

Which quantum number determines the shape of an orbital?

27 / 100

The correct order of reactivity towards nucleophilic substitution reaction for the following is:
(I) CH₃-CH₂-Cl
(II) (CH₃)₂CH-Cl
(III) CH₃-CH₂-Br

28 / 100

The half-life of a first-order reaction is 10 minutes. The time required for the concentration to decrease from 0.1 M to 0.025 M is:

29 / 100

Which of the following has the highest boiling point?

30 / 100

The vertical columns in the periodic table are called:

31 / 100

The percentage of s-character in the hybrid orbitals of ethane, ethene, and ethyne follows the order:

32 / 100

Which of the following has the highest boiling point?

33 / 100

What is the atomic number of an element with 12 protons and 12 neutrons?

34 / 100

The shape of a water molecule is:

35 / 100

Which compound will exhibit geometrical isomerism?

36 / 100

The pH of a neutral solution at 25°C is:

37 / 100

Which salt solution has pH greater than 7?

38 / 100

A solution with a pH of 3 is how many times more acidic than a solution with a pH of 5?

39 / 100

The order of reactivity of halogens in halogenation of alkanes is:

40 / 100

The compound that gives a positive Tollens' test but negative Fehling's test is:

41 / 100

The compound that will undergo the Cannizzaro reaction is:

42 / 100

The hybridization of carbon in ethyne (C₂H₂) is:

43 / 100

The catalyst used in the Contact Process for sulfuric acid manufacture is:

44 / 100

Which of the following is a noble gas?

45 / 100

 According to Boyle's law, at constant temperature:

46 / 100

The half-life of a first-order reaction is 10 minutes. The time taken for the concentration of the reactant to decrease from 1.0 M to 0.125 M is:

47 / 100

 The density of a gas is 2.0 g/L at 1 atm pressure and 27°C. Its molecular mass is:

48 / 100

The atomic number of an element is defined as the number of:

49 / 100

The crystal field splitting energy (Δo) for an octahedral complex is:

50 / 100

Which subatomic particle is located in the nucleus of an atom?

51 / 100

In the electrochemical series, the standard electrode potential is measured relative to:

52 / 100

The general formula for alkanes is:

53 / 100

The mass of 2.24 L of CO₂ gas at STP is:

54 / 100

The Haber process is used for the industrial production of:

55 / 100

In the electrolysis of aqueous CuSO₄ using copper electrodes, the:

56 / 100

 Which of the following is a compound?

57 / 100

Which of the following is a strong electrolyte?

58 / 100

The shape of a methane (CH₄) molecule is:

59 / 100

The boiling point of water at 700 mmHg pressure is:

60 / 100

The number of possible structural isomers for C₇H₁₆ is:

61 / 100

The bond angle in a water molecule is approximately:

62 / 100

The chemical formula for water is:

63 / 100

For a reaction: 2A + B → Products, when concentration of B is doubled, the rate doubles. When concentration of A is doubled, the rate becomes four times. The rate law is:

64 / 100

The IUPAC name for CH₃-CH₂-CHO is:

65 / 100

The unit of molarity is:

66 / 100

The process used to convert vegetable oils into fats is:

67 / 100

Which of the following is an example of a covalent network solid?

68 / 100

 The magnetic moment of [Fe(CN)₆]⁴⁻ is:

69 / 100

In the reaction: Zn + 2HCl → ZnCl₂ + H₂, zinc acts as:

70 / 100

How many electrons can the first shell (K-shell) of an atom hold?

71 / 100

The number of π-bonds in benzene is

72 / 100

The number of moles in 44 grams of CO₂ (C=12, O=16) is:

73 / 100

A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen. Its empirical formula is:

74 / 100

The number of atoms in 4.2 g of nitrogen gas (N₂) is:

75 / 100

The standard enthalpy of formation (ΔH°f) for which of the following substances is zero?

76 / 100

A covalent bond is formed by the:

77 / 100

The rate constant of a reaction is 2.3 × 10⁻⁵ L mol⁻¹ s⁻¹. The order of reaction is:

78 / 100

Which complex shows optical isomerism?

79 / 100

Which of the following is a homogeneous mixture?

80 / 100

For a reaction, ΔG is negative. This means the reaction is:

81 / 100

The rate law for a reaction is found to be Rate = k [A]²[B]. If the concentration of A is doubled and B is halved, the rate of reaction will:

82 / 100

The pH of a neutral solution at 25°C is:

83 / 100

Which state of matter has a definite volume but no definite shape?

84 / 100

 A buffer solution is prepared by mixing:

85 / 100

The IUPAC name of CH₃-CH₂-CH(CH₃)-CHO is:

86 / 100

According to the Kinetic Molecular Theory, the pressure of a gas is due to:

87 / 100

The SI unit of pressure is:

88 / 100

In a chemical reaction, the substance that is completely consumed first is called the:

89 / 100

The reagent used to distinguish between aldehyde and ketone is:

90 / 100

Which element shows the phenomenon of allotropy?

91 / 100

 The number of σ and π bonds in CH₂=CH-C≡N are:

92 / 100

The E° value for the standard hydrogen electrode is assigned a value of:

93 / 100

 The chemical formula of gypsum is:

94 / 100

The oxidation state of chromium in K₂Cr₂O₇ is:

95 / 100

Which halogen is a liquid at room temperature?

96 / 100

In the electrolysis of molten NaCl, the product at the cathode is:

97 / 100

A substance that turns blue litmus paper red is:

98 / 100

The process by which a solid changes directly into vapor without passing through the liquid state is called:

99 / 100

Which element has the highest electronegativity?

100 / 100

 Which alcohol gives iodoform test?

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