Chemistry Fundamentals Practice Questions
20 free Chemistry Fundamentals practice questions for the Static GK. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is the smallest unit of an element that retains its chemical properties?
- A Molecule
- B Atom
- C Compound
- D Ion
Correct answer: Atom
An atom is the smallest unit of an element that retains its chemical properties. It consists of protons, neutrons, and electrons.
Which particle has a negative charge?
- A Proton
- B Neutron
- C Positron
- D Electron
Correct answer: Electron
Electrons carry a negative charge and orbit the nucleus of an atom. Protons are positive and neutrons are neutral.
What is the chemical symbol for gold?
- A Au
- B Ag
- C Gd
- D Cu
Correct answer: Au
The chemical symbol for gold is Au, derived from its Latin name 'Aurum'. It is a highly valuable metal.
Which state of matter has a definite shape and volume?
- A Liquid
- B Gas
- C Plasma
- D Solid
Correct answer: Solid
Solids have a definite shape and volume because their particles are closely packed. They vibrate in fixed positions.
What is the pH value of a neutral solution?
- A 7
- B 0
- C 14
- D 1
Correct answer: 7
A neutral solution has a pH of 7. Pure water is an example of a neutral substance.
Which gas is essential for respiration in humans?
- A Oxygen
- B Nitrogen
- C Carbon dioxide
- D Ozone
Correct answer: Oxygen
Oxygen is essential for respiration. It is used by cells to produce energy.
Which element is the most abundant in the Earth's crust?
- A Oxygen
- B Iron
- C Silicon
- D Aluminum
Correct answer: Oxygen
Oxygen is the most abundant element in the Earth's crust. It forms compounds like oxides and silicates.
What is the chemical formula of water?
- A H2O
- B CO2
- C O2
- D H2SO4
Correct answer: H2O
Water is composed of two hydrogen atoms and one oxygen atom. Its chemical formula is H2O.
Which of the following is a noble gas?
- A Oxygen
- B Nitrogen
- C Hydrogen
- D Helium
Correct answer: Helium
Helium is a noble gas found in Group 18 of the periodic table. It is chemically inert and does not easily react.
What type of bond involves the sharing of electrons?
- A Covalent bond
- B Ionic bond
- C Metallic bond
- D Hydrogen bond
Correct answer: Covalent bond
Covalent bonds involve the sharing of electrons between atoms. This helps them achieve stable electron configurations.
Which element is represented by the symbol 'Na'?
- A Sodium
- B Nitrogen
- C Neon
- D Nickel
Correct answer: Sodium
Na is the symbol for sodium, derived from its Latin name 'Natrium'. It is a highly reactive metal.
What is an acid?
- A Substance that produces OH- ions
- B Substance that produces H+ ions
- C Neutral substance
- D Non-reactive substance
Correct answer: Substance that produces H+ ions
An acid is a substance that releases hydrogen ions (H+) in solution. Examples include hydrochloric acid and sulfuric acid.
Which of the following is a base?
- A HCl
- B NaOH
- C CO2
- D H2SO4
Correct answer: NaOH
NaOH (sodium hydroxide) is a base. It produces hydroxide ions (OH-) in solution.
What is the atomic number of an element?
- A Number of neutrons
- B Number of protons
- C Number of electrons
- D Mass number
Correct answer: Number of protons
The atomic number is the number of protons in the nucleus of an atom. It defines the element.
Which of the following is a chemical change?
- A Melting ice
- B Boiling of water
- C Rusting of iron
- D Freezing water
Correct answer: Rusting of iron
Rusting of iron is a chemical change because it forms a new substance (iron oxide). Physical changes do not create new substances.
Which law states that mass is neither created nor destroyed?
- A Law of conservation of mass
- B Law of conservation of energy
- C Law of definite proportions
- D Law of multiple proportions
Correct answer: Law of conservation of mass
The law of conservation of mass states that mass is conserved in a chemical reaction. It cannot be created or destroyed.
What is a compound?
- A A substance consisting of only one type of atom
- B A physical mixture of two or more substances
- C Two or more elements chemically bonded together
- D An alloy formed by melting metals together
Correct answer: Two or more elements chemically bonded together
A compound is formed when two or more elements chemically combine in fixed proportions. Water is an example.
Which gas is produced during photosynthesis?
- A Carbon dioxide
- B Oxygen
- C Ozone
- D Hydrogen
Correct answer: Oxygen
Oxygen is released during photosynthesis as plants convert carbon dioxide and water into glucose. It is essential for life.
What is the boiling point of water at standard pressure?
- A 0°C
- B 50°C
- C 100°C
- D 150°C
Correct answer: 100°C
Water boils at 100°C at standard atmospheric pressure. At this point, it changes from liquid to gas.
Which element is essential for combustion?
- A Nitrogen
- B Oxygen
- C Hydrogen
- D Carbon
Correct answer: Oxygen
Oxygen supports combustion. It reacts with fuels to release energy in the form of heat and light.