Class 11 Chemistry MCQ

1. Which of the following is a primary pollutant? a) Ozone b) Sulphur dioxide c) Peroxyacetyl nitrate d) Formaldehyde Click to View Answer and Explanation Answer: b) Sulphur dioxide Explanation: Primary pollutants are those directly released into the atmosphere. Sulphur dioxide is a primary pollutant, while others are secondary pollutants. 2. The greenhouse effect is […]

1. Which of the following hydrocarbons has only single bonds between carbon atoms? a) Alkane b) Alkene c) Alkyne d) Aromatic Click to View Answer and Explanation Answer: a) Alkane Explanation: Alkanes are saturated hydrocarbons with only single bonds between carbon atoms. 2. Which hydrocarbon is known as acetylene? a) Ethane b) Ethene c) Ethyne

1. Which of the following is the functional group for alcohols? a) -CHO b) -COOH c) -OH d) -NH2 Click to View Answer and Explanation Answer: c) -OH Explanation: The functional group for alcohols is hydroxyl (-OH). 2. Which of the following organic compounds has a triple bond? a) Alkene b) Alkyne c) Alkane d)

1. Which of the following is NOT an s-block element? a) Lithium b) Beryllium c) Carbon d) Potassium Click to View Answer and Explanation Answer: c) Carbon Explanation: Carbon is a p-block element. 2. Which element is known as the lightest metal? a) Sodium b) Lithium c) Calcium d) Magnesium Click to View Answer and

1. Which of the following is the most abundant element in the universe by mass? a) Oxygen b) Carbon c) Helium d) Hydrogen Click to View Answer and Explanation Answer: d) Hydrogen Explanation: Hydrogen makes up about 75% of the elemental mass of the universe. 2. Which isotope of hydrogen contains one proton and one

1. What does 'Redox' in redox reactions stand for? a) Reduction and Oxidation b) Reactant and Oxidation c) Reducing and Oxygen d) Reactant and Oxygen Click to View Answer and Explanation Answer: a) Reduction and Oxidation Explanation: The term 'Redox' is derived from the words "Reduction" and "Oxidation". 2. In a redox reaction, the substance

1. Which law of thermodynamics introduces the concept of entropy? a) Zeroth law b) First law c) Second law d) Third law Click to View Answer and Explanation Answer: c) Second law Explanation: The second law of thermodynamics introduces the concept of entropy, stating that in all energy transfers, the potential energy of the final

1. Which of the following states of matter has a definite shape and volume? a) Solid b) Liquid c) Gas d) Plasma Click to View Answer and Explanation Answer: a) Solid Explanation: Solids have a fixed structure with a definite shape and volume. 2. The intermolecular force of attraction in gases is: a) Very strong

1. Which bond is formed due to the transfer of electrons from one atom to another? a) Covalent bond b) Ionic bond c) Hydrogen bond d) Coordinate bond Click to View Answer and Explanation Answer: b) Ionic bond Explanation: An ionic bond is formed when one atom donates an electron to another atom. 2. Which

1. Who is credited with the modern periodic table arrangement? a) Mendeleev b) Moseley c) Newlands d) Meyer Click to View Answer and Explanation Answer: b) Moseley Explanation: Moseley, through his work on X-ray wavelengths of elements, proposed the modern arrangement based on atomic numbers. 2. Which property of elements is a periodic function of

1. Who first proposed the idea of an atom being indivisible? a) Rutherford b) Bohr c) Dalton d) Thomson Click to View Answer and Explanation Answer: c) Dalton Explanation: John Dalton introduced the atomic theory in the early 19th century, suggesting that atoms are indivisible and indestructible particles. 2. Which subatomic particle has no charge?

1. Which of the following is NOT a physical property? a) Melting point b) Boiling point c) Reactivity with acid d) Density Click to View Answer and Explanation Answer: c) Reactivity with acid Explanation: Reactivity with acid is a chemical property, not a physical one. 2. The SI unit of mass is: a) Gram b)