Qno. Who discovered hydrogen and give the name?
Ans. Hydrogen is the lightest element among the known elements. It was first recognized by Cavandish in 1766. Lavoisier gave the name Hydrogen because it is main components of common Water . Hydrogen means water producing gas. As hydrogen is the lightest element. it contain only one proton in its nucleus and an electron revolving around the nucleus . It’s atomic number is Z= 1; it’s mass number is 1 and it’s relative atomic mass is 1.008 a.m.u It’s nuclear charge +1 and electronic charge is -1 . It’s valency = 1 it is the only element has no neutron .
Qno. Write abundance of Hydrogen ?
Ans. Hydrogen is the most abundant element of our universe . It is estimated that 92% of the universe is made up of hydrogen 7% of helium, and only 1% for all the other element .
Water contain 11% of hydrogen , sun contain most of it as hydrogen similarly all the sun’s and galaxies contain huge amount .
Qno. How can you justify a separate position of hydrogen is the periodic table of elements ?
Ans. Hydrogen should be placed at separate position
The atomic structure of hydrogen differs so markedly from that of any other element that is more appropriate to all of the separate and distinct place of hydrogen in the periodic table of the elements and not associated with any one the groups or family
1. With its unique structure it can form both ionic as well as covelant compounds .
2. It combines almost all the element of the periodic table .
3. The oxide of hydrogen i.e water is absolutely neutral and it is the best justification of the dual nature of it . Because oxides of IA are basis and oxides of VII A are acidic.
Solved MCQS
Qno.The another name of salt like hydride is ____£
Ans . Ionic Hydrades
Qno. The addition of hydrogen in a compound is generally known as______
Ans. Hydrogenation
Qno. The mixture of hydrogen and CO is called_____
Ans. Water gas
Qno. Tritium has ____ neutrons
Ans. 2
Qno. Hydrogen is a good ____ Agent
Ans. Reducing
Qno. HE is separated from water gas by physical methods called
Ans. Coaling
Qno. Hydrogen has ____ isotopes
Ans. 3
Qno. Ionic Hydrades have high value of melting points due to ______
Ans. Ionic Bonding
Qno. Polymeric hydrides from between hydrogen and elemens of ____
Ans IA
Qno. Langmuir dissociated h2 by using _____
Ans. HEAT
Qno. Vegetable ghee is a___
Ans. Saturated fatty acids
Qno. Haber process needs____
Ans. 500°C/200 atm
Qno. HE decomposes at _____
Ans. 7000 K
Qno. Lene,s process means hydrogen is produced by reaction _____£
Ans. Steam with Fe
Qno. Fe3Q4 called ___
Ans. Magnetic iron oxide
Qno. Methanol reacts with steam yields ____
Ans. Water glass
Qno. Thermal decomposition of ammonia occurs at ____
Ans. 1500° C
Qno. Hydrogen and halogens both gain their complete Valence shell by _____
Ans. Gaining one electron
Qno. Electronegativity value of hydrogen is similar to ___
Ans. IV A
Qno. The most suitable process for the preparation of water glass ____
Ans. Bosch
Qno. Hydronium ion a/an _____
Ans. Ion with the formula H3O+
Qno. Hydrogen at the time of its libration is known as _____
Ans. Nascent Hydrogen
Qno. The formula of heavy water is ______
Ans. D²O
Qno. Hydrogen loses its electron to H+ ion . In this respect it resembles_____
Ans. Noble gases
Qno. The atomic weight of hydrogen is ____
Ans. 1.008
Qno. The symbol of hydrides ion is ____
Ans. H-
Qno. Hydronium ion is represented as_____
Ans. H3 O+
Qno. The maximum abundance of protuim in ordinary hydrogen gas is ____
Ans. 99.98%
Qno. There are two naturally occurring forms and one artificially produced form of hydrogen ____
Ans. Isotopes
Qno. Hydrogen was discovered by ___
Ans. Cavendish
Qno. The bond energy of hydrogen is ___
Ans. 104 kcal/mole
Qno. Hydrogen is industrial manufactured by passing steam over red hot come . This method is known as _____
Ans. Bosch process
Qno. Hydrogen molecules consists of two atoms linked together by strong
Ans. Covelant bond