Free Chemistry in Daily Life MCQs with Answers

1. What is the chemical name of common table salt?

• A. Sodium bicarbonate
• B. Sodium chloride
• C. Calcium carbonate
• D. Potassium chloride

Explanation: Table salt is sodium chloride, NaCl. Sodium bicarbonate (NaHCO₃) is baking soda and calcium carbonate (CaCO₃) is limestone — both common distractors in everyday science papers.

2. Evaporation is _________ ?

• A. Cooling process
• B. Exothermic process
• C. Bottom process
• D. Rare processEveryday Science MCQs

Explanation: Evaporation causes cooling because the fastest, highest-energy molecules escape from the liquid surface, leaving lower-energy molecules behind. It is therefore an endothermic cooling process, not an exothermic one.

3. Which gas is most commonly used in neon signs?

• A. Argon
• B. Neon
• C. Krypton
• D. Xenon

Explanation: Neon signs traditionally use low-pressure neon gas, which glows reddish-orange when electrically excited. Other noble gases can produce different colours in discharge tubes, but they are not the defining gas of neon signs.

4. Nucleus of an atom was discovered by___________?

• A. Goldstein
• B. James Chadwick
• C. J J Thomson
• D. Rutherford

Explanation: Rutherford’s gold-foil experiment showed that nearly all the atom’s positive charge and mass are concentrated in a tiny central nucleus. Thomson discovered the electron, while Chadwick discovered the neutron.

5. The molecular mass of Water molecule is __________?

• A. 16amu
• B. 17amu
• C. 18amu
• D. 20amu

Explanation: A water molecule contains two hydrogen atoms and one oxygen atom, so its molecular mass is 2(1) + 16 = 18 atomic mass units. This is written as H₂O.

6. Vertical columns in the periodic table of elements are called as__________?

• A. Periods
• B. Groups
• C. Rows
• D. Lanthanoids series

Explanation: The vertical columns of the periodic table are called groups, and elements in a group generally have similar valence-electron arrangements and chemical properties. Horizontal rows are called periods.

7. Element extracted from Sea water?

• A. Beryllium
• B. Magnesium
• C. Aluminium
• D. None of These

Explanation: Magnesium compounds are present in seawater and magnesium metal is commercially obtained from them, commonly by electrolysis of molten magnesium chloride. Beryllium and aluminium are not normally extracted from seawater on this basis.

8. The property by virtue of which metals can be beaten into thin sheets is known as?

• A. Ductility
• B. Malleability
• C. Conductivity
• D. Density

Explanation: Malleability is the ability of a metal to be hammered or pressed into thin sheets. Ductility is the related ability to be drawn into wires.

9. Fuse wire is made of_____________?

• A. 63% tin and 37% lead
• B. 63% lead and 37% tin
• C. 63% tin and 37% aluminum
• D. 63% lead and 37% aluminum

Explanation: Traditional solder is a low-melting alloy of about 63% tin and 37% lead, allowing it to melt and join components without melting them. Many modern solders now avoid lead for health and environmental reasons.

10. The number of electrons of a neutral atom is automatically known if one knows the?

• A. Atomic number
• B. Atomic weight
• C. Number of orbitals
• D. none

Explanation: The atomic number equals the number of protons, and a neutral atom has equal numbers of protons and electrons. Therefore, its atomic number directly gives its electron count.