Sindh MDCAT Re-Conduct 2023 Paper

121- What happens to the equilibrium constant (Kc) when a catalyst is added to a chemical system at equilibrium ?

A. It increases
B. It decreases
C. It becomes zero
D. It remains unchanged 

Answer : D. It remains unchanged

122- The outer cell of a dry cell is typically composed of:

A. Iron
B. Lead
C. Copper
D. Zinc

Answer : D. Zinc

123- Which process occurs at the anode during an electrochemical reaction ?

A. Ionization
B. Reduction
C. Electropositivity
D. Oxidation

Answer : D. Oxidation

124- The dipole moment of CS2 (Carbon disulfide) is:

A. Infinite
B. Strong
C. Zero
D. Moderate

Answer : C. Zero

125- The molecule NH3 (Ammonia) has a molecular shape that can be described as:

A. Trigonal planar
B. Trigonal pyramidal
C. Tetrahedral
D. Linear

Answer : B. Trigonal pyramidal

126- In the first law of thermodynamics, the initial and final state of a system depend upon:

A. Pressure
B. Energy
C. Volume
D. Temperature

Answer : B. Energy

127- In the chemical reaction NHO2 → NO2, what is the order of the reaction ?

A. Zeroth order
B. First order
C. Second order
D. Third order

Answer : B. First order

128- The general gas equation is a combination of:

A. Avogadro’s law and Gay-Lussac’s law
B. Boyle’s law and Avogadro’s law
C. Boyle’s law and Charles’ law
D. Charles’ law and Avogadro’s law

Answer : C. Boyle’s law and Charles’ law

129- The smallest repeating pattern on which a lattice is built in a crystal structure is known as:

A. Crystallography
B. Unit cell
C. Crystal lattice
D. Molecular structure

Answer : B. Unit cell

130- In the context of chemical equilibrium, what does the term Kc represent ?

A. Equilibrium constant
B. Kinetic constant
C. Reaction rate constant
D. Catalyst constant

Answer : A. Equilibrium constant

131- For the chemical reaction 2HI→H2​+I2​, what is the order of the reaction ?

A. Zeroth order
B. First order
C. Second order
D. Third order

Answer : C. Second order

132- In reaction A → B, the rate of disappearance is best represented by:

A. -dA / dt
B. -dAB / dt
C. -dB / dt
D. dB / dt

Answer : A. -dA / dt

133- At ordinary conditions, formaldehyde is typically found in which state ?

A. Gas
B. Liquid
C. Plasma
D. Solid

Answer : A. Gas

134- What is the molecular weight range of water-soluble proteins ?

A. Variable
B. Low
C. High
D. Medium 

Answer : C. High

135- Which statement describes the condition at equilibrium ?

A. Backward reaction rate is greater than the rate of forward reaction
B. Forward and backward reactions cease
C. Forward reaction rate equals the rate of backward reaction
D. Forward reaction rate is greater than the rate of backward reaction

Answer : C. Forward reaction rate equals the rate of backward reaction

136- Which of the following vitamins are classified as fat-soluble ?

A. A, D, K, and E
B. C, B12, biotin, and folate
C. B1, B2, B3, and B6
D. B5, B7, B9, and C

Answer : A. A, D, K, and E

137- To obtain the maximum amount of product in a balanced chemical reaction, which concept should be utilized ?

A. Stoichiometry
B. Actual yield
C. Theoretical yield
D. Excess reactant

Answer : C. Theoretical yield

138- What is the approximate percentage of oxygen in water by mass ?

A. 11.11%
B. 33.33%
C. 20.00%
D. 88.88%

Answer : D. 88.88%

139- In a chemical reaction, which characteristic defines the limiting reactant ?

A. Is in excess
B. Produces the maximum number of moles of products
C. Produces the minimum number of moles of products
D. Reacts completely

Answer : C. Produces the minimum number of moles of products

140- What is the defining characteristic of a nucleophile ?

A. Electron-rich species
B. Neutral species
C. Electron-deficient species
D. Charged species

Answer : A. Electron-rich species

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