Hydrogren Flashcards
sAll questions based on Hydrogen chapter of dr. dalal's simplified icse chemistry
What is the atomic number of hydrogen?
1
True or False: Hydrogen is the lightest element in the periodic table.
True
What is the chemical symbol for hydrogen?
H
Fill in the blank: Hydrogen is a __________ at room temperature.
gas
Which of the following is a common isotope of hydrogen? (a) Deuterium (b) Helium (c) Lithium
a) Deuterium
What is the molecular formula of hydrogen gas?
H2
True or False: Hydrogen is a non-metal.
True
What is the primary use of hydrogen in the industry?
As a fuel and in the production of ammonia.
Fill in the blank: Hydrogen can react with oxygen to form __________.
water
What is the standard state of hydrogen?
Gas
Which bond is formed in the hydrogen molecule (H2)?
Covalent bond
True or False: Hydrogen can exist in a liquid state at extremely low temperatures.
True
What is the most abundant element in the universe?
Hydrogen
Name the process by which hydrogen is produced from water.
Electrolysis
What is the main component of the sun?
Hydrogen
Fill in the blank: Hydrogen is used in __________ to produce fertilizers.
Haber process
True or False: Hydrogen has no color, odor, or taste.
True
What is the pH of a hydrogen ion solution?
0
Which element is formed when hydrogen burns in air?
Water (H2O)
Fill in the blank: Hydrogen is often referred to as the __________ fuel.
clean
What is the enthalpy of formation for hydrogen gas?
0 kJ/mol
True or False: Hydrogen can be used as a reducing agent in chemical reactions.
True
What is the density of hydrogen compared to air?
Lighter than air
What is the reactivity of hydrogen with metals?
Hydrogen reacts with some metals to form hydrides.
