Chemistry Discoveries — Set 1
Inventions · रसायन की खोजें · Questions 1–10 of 70
Who is traditionally known as the 'Father of Modern Chemistry'?
Correct Answer: C. Antoine Lavoisier
• **Antoine Lavoisier** = established the law of conservation of mass and identified oxygen's role in combustion. • **18th century** — marked a crucial shift in the field of chemistry from qualitative to quantitative. • 💡 Wrong-option analysis: Dmitri Mendeleev: developed the periodic table; John Dalton: formulated the first modern atomic theory; Robert Boyle: developed Boyle's Law, but not specifically 'Father of Modern Chemistry'.
Which scientist discovered the electron in 1897 using cathode ray tube experiments?
Correct Answer: D. J.J. Thomson
• **J.J. Thomson** = discovered the electron, proving atoms were not indivisible, using cathode ray tube experiments. • **1897** — the year Thomson discovered the electron, leading to the 'plum pudding' model of the atom. • 💡 Wrong-option analysis: Niels Bohr: proposed the Bohr model of the atom; James Chadwick: discovered the neutron; Ernest Rutherford: discovered the atomic nucleus.
The Periodic Table in its most recognizable early form was developed by whom?
Correct Answer: C. Dmitri Mendeleev
• **Dmitri Mendeleev** = developed the Periodic Table, arranging elements by atomic mass and predicting undiscovered elements. • **1869** — the approximate year Mendeleev published his first periodic table, leaving gaps for future discoveries. • 💡 Wrong-option analysis: Henry Moseley: later arranged the periodic table by atomic number; Lothar Meyer: developed a similar periodic table independently but later; John Newlands: proposed the Law of Octaves, an early attempt at classification.
Who discovered the radioactive element Radium alongside Polonium?
Correct Answer: C. Marie Curie
• **Marie Curie** = discovered the radioactive elements Radium and Polonium and coined the term 'radioactivity'. • **Two different scientific fields** — Marie Curie is the only person to win Nobel Prizes in both Physics and Chemistry. • 💡 Wrong-option analysis: Henri Becquerel: discovered natural radioactivity; Ernest Rutherford: known for the atomic nucleus discovery; Wilhelm Röntgen: discovered X-rays.
The discovery of the Atomic Nucleus resulted from which famous experiment?
Correct Answer: C. Gold Foil Experiment
• **Gold Foil Experiment** = conducted by Ernest Rutherford, it led to the discovery of the Atomic Nucleus. • **Alpha particles** — were observed reflecting off gold atoms, proving the existence of a dense central core. • 💡 Wrong-option analysis: Double Slit Experiment: demonstrated wave-particle duality; Oil Drop Experiment: measured the charge of an electron; Discharge Tube Experiment: led to the discovery of electrons.
Who formulated the first modern Atomic Theory, stating that all matter is composed of small particles called atoms?
Correct Answer: D. John Dalton
• **John Dalton** = formulated the first modern Atomic Theory, stating that all matter is composed of small particles called atoms. • **Early 19th century** — when Dalton published his atomic theory, providing a framework for chemical reactions. • 💡 Wrong-option analysis: Michael Faraday: known for laws of electrolysis; Joseph Proust: proposed the Law of Definite Proportions; Democritus: an ancient Greek philosopher who first conceptualized 'atomos'.
Which gas was discovered by Joseph Priestley and later named by Lavoisier?
Correct Answer: D. Oxygen
• **Oxygen** = was discovered by Joseph Priestley and later named by Lavoisier. • **1774** — the year Joseph Priestley isolated this gas, calling it 'dephlogisticated air'. • 💡 Wrong-option analysis: Carbon Dioxide: discovered by Joseph Black; Hydrogen: discovered by Henry Cavendish; Nitrogen: discovered by Daniel Rutherford.
Who is credited with the discovery of the Neutron in 1932?
Correct Answer: C. James Chadwick
• **James Chadwick** = is credited with the discovery of the Neutron, a neutral subatomic particle. • **1932** — the year Chadwick identified the neutron, completing the fundamental understanding of the atom's nucleus. • 💡 Wrong-option analysis: Werner Heisenberg: known for the uncertainty principle; Enrico Fermi: contributed to the first nuclear reactor; Niels Bohr: proposed the atomic model with electron shells.
The concept of 'Isotopes' was first proposed by which scientist?
Correct Answer: C. Frederick Soddy
• **Frederick Soddy** = first proposed the concept of 'Isotopes', elements with the same chemical properties but different atomic weights. • **1921** — the year Soddy received the Nobel Prize in Chemistry for his work on radioactive substances and isotopes. • 💡 Wrong-option analysis: Otto Hahn: known for the discovery of nuclear fission; Francis Aston: confirmed the existence of isotopes using a mass spectrometer; Glenn Seaborg: discovered many transuranic elements.
Which chemist developed the process for synthesizing Ammonia from nitrogen and hydrogen?
Correct Answer: D. Fritz Haber
• **Fritz Haber** = developed the process for synthesizing Ammonia from nitrogen and hydrogen, known as the Haber-Bosch process. • **Global food supply** — the Haber process significantly increased it by enabling mass production of fertilizers. • 💡 Wrong-option analysis: Carl Bosch: scaled up the Haber process for industrial production; Svante Arrhenius: developed an early acid-base theory; Linus Pauling: known for work on chemical bonding and electronegativity.