Hydrogen MCQs

Hydrogen is the most abundant element in the universe and the third most abundant on Earth’s surface. It was discovered by Henry Cavendish and named by Lavoisier. Hydrogen is the lightest and smallest non-metallic element in the periodic table. It shares the same electronic configuration as alkali metals, possessing only one valence electron, and is electropositive like these metals. Hydrogen is an effective reducing agent and exhibits a +1 oxidation state, similar to alkali metals. It forms the cation H+, analogous to the M+ cation formed by alkali metals when they lose one electron. Hydrogen has a strong affinity for non-metals and combines with them to form various compounds, such as oxides and halides.

A reactant containing the element that is oxidised is called

(a) reducing agent
(b) oxidising agent
(c) hydrogen
(d) sublime

The electrolyte among the following is

(a) NaOH
(b) Urea
(c) glucose
(d) benzene

Electrolysis of brine produces

(a) chlorine gas
(b) hydrogen gas
(c) sodium hydroxide
(d) all the above

O-O-H bond angle in H2O2 is

(a) 97°
(b) 106°
(c) 120°
(d) 109°28′

The list which contains only elements is

(a) air, water, oxygen
(b) hydrogen, oxygen, brass
(c) air, water, fire, earth
(d) calcium, sulphur, carbon

Loss of hydrogen atoms by an element is called

(a) hydrogenation
(b) oxidation
(c) reduction
(d) sublimation

The smallest part of an element that cannot exist as a free state is

(a) ion
(b) charge
(c) atom
(d) molecule

Electrolytes conduct electricity in

(a) solid state
(b) liquid state
(c) gaseous state
(d) plasma state

Which of the following is very high for proton?

(a) radius
(b) ionization potential
(c) charge
(d) hydration energy

By losing one or two electrons the atoms of metal are

(a) oxidised
(b) reduced
(c) hydrogenated
(d) sublimated