Class 12 Chemistry MCQ

1. Which of the following is an antiseptic? a) Phenol b) Aspirin c) Paracetamol d) Sodium bicarbonate Click to View Answer and Explanation Answer: a) Phenol Explanation: Phenol has antiseptic properties and is used to disinfect wounds. 2. Which component gives the spicy flavor to chili peppers? a) Curcumin b) Capsaicin c) Caffeine d) Quinine […]

1. Which of the following is a natural polymer? a) Polythene b) PVC c) Rubber d) Nylon Click to View Answer and Explanation Answer: c) Rubber Explanation: Rubber is a natural polymer while the rest are synthetic polymers. 2. The process of forming polymers from monomers is called: a) Hydrolysis b) Polymerization c) Fermentation d)

1. Which of the following is a monosaccharide? a) Glucose b) Sucrose c) Lactose d) Maltose Click to View Answer and Explanation Answer: a) Glucose Explanation: Glucose is a simple sugar or monosaccharide, while the others are disaccharides. 2. Which base is not present in DNA? a) Adenine b) Uracil c) Guanine d) Cytosine Click

1. Which of the following amines is primary? a) Dimethylamine b) Aniline c) Trimethylamine d) Diethylamine Click to View Answer and Explanation Answer: b) Aniline Explanation: Aniline has one alkyl/aryl group attached to the nitrogen, making it a primary amine. 2. The functional group of amines is: a) -COOH b) -C=O c) -OH d) -NH2

1. Which of the following is an aliphatic aldehyde? a) Formaldehyde b) Benzaldehyde c) Acetaldehyde d) Phthalaldehyde Click to View Answer and Explanation Answer: c) Acetaldehyde Explanation: Acetaldehyde is an aldehyde with an alkyl group, hence it is aliphatic. 2. The IUPAC name for the compound CH3-CO-CH2-CH3 is: a) 2-Butanone b) Propanone c) Butanal d)

1. Which of the following is a secondary alcohol? a) Methanol b) Ethanol c) Propan-2-ol d) Phenol Click to View Answer and Explanation Answer: c) Propan-2-ol Explanation: In secondary alcohols, the OH group is attached to a carbon atom that is bonded to two other carbon atoms. 2. Which compound is formed on oxidation of

1. Which of the following compounds will have the highest dipole moment? a) CH3Cl b) CH3F c) CH3Br d) CH3I Click to View Answer and Explanation Answer: b) CH3F Explanation: Fluorine is highly electronegative, leading to a significant charge separation and a higher dipole moment in CH3F. 2. Which of the following is not a

1. Which of the following terms is used for the ion or molecule bound directly to the metal atom? a) Counter ion b) Ligand c) Chelate d) Coordination entity Click to View Answer and Explanation Answer: b) Ligand Explanation: Ligands are ions or molecules that can donate pairs of electrons to the central metal atom

1. Which of the following elements is not a part of the d-block? a) Iron b) Copper c) Zinc d) Lanthanum Click to View Answer and Explanation Answer: d) Lanthanum Explanation: Lanthanum is an f-block element and is the first element of the lanthanides series. 2. Which element has the electronic configuration [Xe] 4f^7 5d^1

1. Which of the following elements has the maximum number of valence electrons? a) Nitrogen b) Oxygen c) Fluorine d) Neon Click to View Answer and Explanation Answer: d) Neon Explanation: Neon, being a noble gas, has a full valence shell with 8 electrons. 2. Which gas is produced when chlorine reacts with cold and

1. Which of the following is an ore of iron? a) Bauxite b) Galena c) Hematite d) Cinnabar Click to View Answer and Explanation Answer: c) Hematite Explanation: Hematite (Fe2O3) is an iron ore, while the other options are ores of different metals. 2. The process in which ore is heated in the absence of

1. Which of the following is NOT a type of adsorption? a) Physical adsorption b) Chemical adsorption c) Absorption d) Ionic adsorption Click to View Answer and Explanation Answer: c) Absorption Explanation: Absorption is a bulk phenomenon where a substance uniformly enters another. It's not a type of adsorption, which is a surface phenomenon. 2.

1. The rate of a chemical reaction doubles when its temperature is increased from 20°C to 40°C. What is the activation energy of the reaction? a) 30 kJ/mol b) 50 kJ/mol c) 60 kJ/mol d) 120 kJ/mol Click to View Answer and Explanation Answer: c) 60 kJ/mol Explanation: Using the Arrhenius equation and given data,

1. The half-reaction that represents oxidation is: a) Fe3+ + 3e- -> Fe b) Cu2+ + 2e- -> Cu c) Zn -> Zn2+ + 2e- d) 2H+ + 2e- -> H2 Click to View Answer and Explanation Answer: c) Zn -> Zn2+ + 2e- Explanation: Oxidation involves the loss of electrons. Here, Zn loses 2

1. A solution which cannot dissolve any more solute at a given temperature is termed: a) Unsaturated b) Saturated c) Supersaturated d) Diluted Click to View Answer and Explanation Answer: b) Saturated Explanation: A saturated solution is one in which no more solute can be dissolved at a particular temperature. 2. The unit of molality

1. Which of the following is not a characteristic of a crystalline solid? a) Definite melting point b) Anisotropy c) Irregular arrangement of particles d) Orderly arrangement of particles Click to View Answer and Explanation Answer: c) Irregular arrangement of particles Explanation: Crystalline solids have a regular and orderly arrangement of particles. 2. In which