Past Papers of Chemistry for Initial Tests
If you are doing preparation for the initial tests of Pak Army TCC (Technical Cadet Course), Pak Navy or PAF then this is right place for free online notes. It helps to pass the initial tests with 100% success. See the following notes of Chemistry. In the following 100 best MCQs are given.
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Question: What is the maximum number of electrons that can occupy the third energy level (n = 3) of an atom?
A) 2
B) 8
C) 18
D) 32
Answer: C) 18
Question: Which of the following elements is a halogen?
A) Sodium (Na)
B) Chlorine (Cl)
C) Calcium (Ca)
D) Iron (Fe)
Answer: B) Chlorine (Cl)
Question: What type of bond is formed between a metal and a non-metal?
A) Covalent bond
B) Ionic bond
C) Metallic bond
D) Hydrogen bond
Answer: B) Ionic bond
Question: Which of the following is NOT a property of gases?
A) Definite shape
B) High compressibility
C) Low density
D) Expands to fill the container
Answer: A) Definite shape
Question: What is the pH of a neutral solution at 25°C?
A) 0
B) 7
C) 14
D) 10
Answer: B) 7
Question: In a combustion reaction, what is always a product?
A) Carbon dioxide (CO₂)
B) Water (H₂O)
C) Oxygen (O₂)
D) Both A and B
Answer: D) Both A and B
Question: Which functional group is present in alcohols?
A) -COOH
B) -OH
C) -CHO
D) -NH₂
Answer: B) -OH
Question: Which law of thermodynamics states that energy cannot be created or destroyed?
A) Zeroth Law
B) First Law
C) Second Law
D) Third Law
Answer: B) First Law
Question: In an electrochemical cell, oxidation occurs at which electrode?
A) Cathode
B) Anode
C) Both electrodes
D) Salt bridge
Answer: B) Anode
Question: What is the effect of a catalyst on a chemical reaction?
A) Increases the activation energy
B) Decreases the activation energy
C) Does not affect the activation energy
D) Stops the reaction
Answer: B) Decreases the activation energy
Question: How many moles of oxygen are required to completely react with 2 moles of hydrogen to form water?
A) 1 mole
B) 2 moles
C) 0.5 moles
D) 4 moles
Answer: A) 1 mole
Question: What is emitted during alpha decay?
A) An electron
B) A helium nucleus
C) A photon
D) A neutron
Answer: B) A helium nucleus
Question: What is the term for a solution that contains the maximum amount of solute at a given temperature?
A) Unsaturated
B) Saturated
C) Supersaturated
D) Dilute
Answer: B) Saturated
Question: In the reaction 2Mg+O2→2MgO2Mg+O2→2MgO, which element is oxidized?
A) Magnesium (Mg)
B) Oxygen (O)
C) Both
D) Neither
Answer: A) Magnesium (Mg)
Question: What is the coordination number of the central metal ion in [Co(NH3)6]3+[Co(NH3)6]3+?
A) 2
B) 4
C) 6
D) 8
Answer: C) 6
Question: Which subatomic particle has a negligible mass compared to protons and neutrons?
A) Proton
B) Neutron
C) Electron
D) Positron
Answer: C) Electron
Question: Which group of elements is known as the alkaline earth metals?
A) Group 1
B) Group 2
C) Group 17
D) Group 18
Answer: B) Group 2
Question: Which molecule has a tetrahedral shape?
A) CO₂
B) CH₄
C) H₂O
D) NH₃
Answer: B) CH₄
Question: What is the process called when a solid changes directly into a gas without passing through the liquid phase?
A) Melting
B) Sublimation
C) Condensation
D) Deposition
Answer: B) Sublimation
Question: Which of the following is a strong acid?
A) Acetic acid (CH₃COOH)
B) Hydrochloric acid (HCl)
C) Carbonic acid (H₂CO₃)
D) Boric acid (H₃BO₃)
Answer: B) Hydrochloric acid (HCl)
Question: What type of reaction is represented by the equation 2H2+O2→2H2O2, H2+O2→2H2O?
A) Decomposition
B) Combustion
C) Neutralization
D) Displacement
Answer: B) Combustion
Question: What is the IUPAC name of CH3CH2OH?
A) Methanol
B) Ethanol
C) Propanol
D) Butanol
Answer: B) Ethanol
Question: What is the SI unit of entropy?
A) Joule (J)
B) Kelvin (K)
C) Joule per Kelvin (J/K)
D) Pascal (Pa)
Answer: C) Joule per Kelvin (J/K)
Question: In a galvanic cell, which electrode is positively charged?
A) Anode
B) Cathode
C) Both electrodes
D) Salt bridge
Answer: B) Cathode
Question: What is the order of a reaction if the rate is independent of the concentration of the reactant?
A) Zero order
B) First order
C) Second order
D) Third order
Answer: A) Zero order
Question: How many grams of O2 are required to react completely with 4 grams of H2 to form water?
A) 8 g
B) 16 g
C) 32 g
D) 64 g
Answer: C) 32 g
Question: What is the half-life of a radioactive isotope?
A) The time taken for half the nuclei to decay
B) The time taken for all the nuclei to decay
C) The time taken for the nuclei to double
D) The time taken for the nuclei to stabilize
Answer: A) The time taken for half the nuclei to decay
Question: What is the molality of a solution prepared by dissolving 1 mole of solute in 1 kg of solvent?
A) 1 m
B) 0.5 m
C) 2 m
D) 0.1 m
Answer: A) 1 m
Question: In the reaction Zn+CuSO4→ZnSO4+Cu which element is reduced?
A) Zinc (Zn)
B) Copper (Cu)
C) Sulfur (S)
D) Oxygen (O)
Answer: B) Copper (Cu)
Question: What is the oxidation state of the central metal ion in [Fe(CN)6]3−[Fe(CN)6]3−?
A) +1
B) +2
C) +3
D) +4
Answer: C) +3
100 Past Papers of Chemistry with Answers
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