Flashcards for NEET Chemistry - Hydrogen

Flashcards for NEET Chemistry are designed to boost your NEET preparation. Find below flashcards for the chapter “Hydrogen”. These flashcards are prepared as per the NEET syllabus. These are helpful for aspirants of NEET and other exams during last-minute revision. It covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Chemistry.

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Dihydrogen (H2)

The most abundant element in the universe

70% of the total mass of the universe

0.15% by mass in the earth’s atmosphere

Isotopes of Hydrogen

Protium – 11H (No neutrons)

Deuterium (Heavy hydrogen) – 12H (One neutron)

Tritium – 13H (Two neutrons)

Laboratory Preparation of Dihydrogen

By the reaction of zinc with dilute hydrochloric acid

Zn + 2H+ → Zn2+ + H2

By the reaction of zinc with aqueous alkali

Zn + 2NaOH → Na2ZnO2 + H2

Commercial Production of Dihydrogen

Electrolysing warm aqueous barium hydroxide solution between nickel electrodes

By electrolysis of brine solution

By the reaction of steam on hydrocarbons or coke at high temperatures

Physical Properties of Dihydrogen

It is a colourless, odourless, tasteless and combustible gas

It is lighter than air and insoluble in water

Reaction of Dihydrogen with Sodium

Dihydrogen is reduced by sodium to form NaH

2 Na(s) + H2(g) → 2 NaH(s)

Reaction of Dihydrogen with Copper(II) Oxide

Dihydrogen reduces copper(II) oxide to copper in the elemental state and itself gets oxidised to H2O

CuO + H2 → Cu + H2O

Uses of Dihydrogen

Synthesis of ammonia

Manufacturing of vanaspati ghee by hydrogenation of vegetable oils

It is used to reduce heavy metal oxides to metals

Used in fuel cells and as a rocket fuel

Structure of Water

Its shape is bent in the gaseous phase

Bond angle – 104.5°

O–H bond length – 95.7 pm

Hard Water

Hardness is due to the presence of calcium and magnesium salts in the form of hydrogen carbonate, chloride and sulphate

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