Question

Who discovered hydrogen?

Answer 1

Hint: The chemical element hydrogen has the symbol H and the atomic number 1. The lightest element in the periodic table is hydrogen. Under normal circumstances, hydrogen is a gas composed of diatomic molecules with the formula H2. It's odorless, colorless, non-toxic, and extremely flammable. Hydrogen is the most abundant chemical element in the universe, accounting for around 75% of all ordinary stuff.

Complete answer:
Robert Boyle discovered and reported the interaction of iron filings with dilute acids, which produces hydrogen gas, in 1671. Henry Cavendish was the first to recognize hydrogen gas as a distinct material in 1766, when he named the gas produced by a metal-acid interaction "inflammable air." He hypothesized that "inflammable air" was the same as a mythical substance called "phlogiston," and discovered in 1781 that when gas is burned, it creates water. He is commonly credited with discovering hydrogen as an element. When Antoine Lavoisier and Pierre Laplace replicated Cavendish's discovery that water is created when hydrogen is burnt in 1783, they named the element hydrogen.
James Dewar used regenerative cooling and his innovation, the vacuum flask, to liquefy hydrogen for the first time in 1898. The next year, he developed solid hydrogen. Harold Urey found deuterium in December 1931, while Ernest Rutherford, Mark Oliphant, and Paul Harteck prepared tritium in 1934. Urey's group discovered heavy water in 1932, which contains deuterium instead of normal hydrogen. The first de Rivaz engine, an internal combustion engine fueled by a combination of hydrogen and oxygen, was created in 1806 by François Isaac de Rivaz. In 1819, Edward Daniel Clarke created the hydrogen gas blowpipe. In 1823, Döbereiner's lamp and limelight were created.
Hence Henry Cavendish is the correct answer

Note:
Jacques Charles developed the first hydrogen-filled balloon in 1783. Following Henri Giffard's development of the first hydrogen-lifted airship in 1852, hydrogen supplied the lift for the first dependable method of air travel. The notion of rigid airships raised by hydrogen, subsequently known as Zeppelins, was championed by German count Ferdinand von Zeppelin, and the first of them took to the air in 1900. Regularly scheduled flights began in 1910, and by the onset of World War I in August 1914, they had safely transported 35,000 people. During the war, hydrogen-lifted airships were utilized as observation platforms and bombs.