Free Chemistry in Daily Life MCQs with Answers

291. In the manufacture of banaspati ghee the gas used is __________?

• A. Helium
• B. Hydrogen
• C. Oxygen
• D. Nitrogen

Explanation: Hydrogen is used to add hydrogen atoms to unsaturated vegetable oils, converting them into the more solid fat used in banaspati ghee. This industrial process is called hydrogenation.

292. Which Gas is used in the preparation of Soft drinks?

• A. Oxygen
• B. Carbon dioxide
• C. Nitrogen
• D. Halogen

Explanation: Carbon dioxide dissolves in soft drinks under pressure and forms weak carbonic acid, producing their characteristic fizz and slight tang. Oxygen and nitrogen do not provide this carbonation.

293. Sodium carbonate is produced by____________?

• A. haber process
• B. Amonia solvay process
• C. decons process
• D. lead chamber process

Explanation: Sodium carbonate is manufactured industrially by the Solvay process, which uses ammonia, brine, limestone and carbon dioxide. The Haber process produces ammonia, not sodium carbonate.

294. The repetition of property after a certain interval called ___________?

• A. Electron efinity
• B. Atomic radius
• C. periodicity of property
• D. none of these

Explanation: Periodicity is the regular repetition of similar properties at definite intervals when elements are arranged by atomic number. Atomic radius and electron affinity are individual properties, not the repetition itself.

295. The soul of chemistry is dealing with___________?

• A. Internal structural changes in matter
• B. Composition of matter
• C. Properties of matter
• D. Composition and properties of matter

Explanation: Chemistry studies what matter is made of and how its composition determines its properties. Structural and chemical changes are also central, making “composition and properties” the best available option.

296. Elements are made of _________?

• A. Atoms
• B. Molecules
• C. H2O
• D. Compounds

Explanation: An element consists of atoms that all have the same number of protons. Molecules and compounds may contain atoms of two or more different elements, so they are not the basic definition of an element.

297. ____________ have no charge?

• A. Neutrons
• B. Protons
• C. Electrons
• D. None of These

Explanation: Neutrons have no electric charge, whereas protons are positive and electrons are negative. Neutrons and protons are located in the atomic nucleus.

298. ___________are negatively (-) charged particles of an atom?

• A. Protons
• B. Neutrons
• C. Electrons
• D. None of These

Explanation: Electrons carry a negative electric charge and occupy regions around the nucleus called electron shells or orbitals. Protons are positive and neutrons are electrically neutral.

299. _____________ are positively (+) charged particles?

• A. Neutrons
• B. Electrons
• C. Protons
• D. None of These

Explanation: Protons carry a positive electric charge and are found in the nucleus. Electrons carry negative charge, while neutrons have no charge.

300. The protons and neutrons are found in the center of the atom, which is called the _________of the atom?

• A. Nucleus
• B. Headquarters
• C. Hub
• D. None of These

Explanation: The dense central region containing an atom’s protons and neutrons is called the nucleus. Electrons occupy the space surrounding the nucleus.