Free Chemistry in Daily Life MCQs with Answers

51. LPG consists mainly of : ___________?

• A. Methane,Ethane & Hexane
• B. Ethane,Hexane &Nonane
• C. Methane,Butane & Propane
• D. All of these

Explanation: LPG is composed mainly of propane and butane, with small amounts of related hydrocarbons. Methane is the main component of natural gas, not LPG.

52. Water is a good solvent of ionic salts because:

• A. It has a high specific heat
• B. It has no colour
• C. It has a high dipole moment
• D. None of these

Explanation: Water molecules are strongly polar, so their opposite partial charges attract and separate ions in an ionic crystal. High specific heat and lack of colour do not explain its dissolving power.

53. What is the chemical name of Oil of Vitriol?

• A. Hydrochloric Acid
• B. Sulphuric Acid
• C. Nitric Acid
• D. Muriatic Acid

Explanation: Oil of vitriol is the historical name for concentrated sulphuric acid, H₂SO₄. Hydrochloric acid is also called muriatic acid, which is a separate substance.

54. Smoke is an solution of _________?

• A. Solid in solid
• B. Solid in liquid
• C. Solid in gas
• D. Gas in gas

Explanation: Smoke is an aerosol containing tiny solid particles dispersed through a gas, usually air. A solid dispersed in a gas is therefore the best description among the options.

55. Fog is an example of _________?

• A. Gas in gas
• B. Gas in liquid
• C. Liquid in Gas
• D. Liquid in liquid

Explanation: Fog consists of tiny liquid water droplets dispersed through air, so it is a liquid-in-gas aerosol. Clouds have the same basic dispersed-particle arrangement, although they occur higher in the atmosphere.

56. Which of the following will you use to remove rust stains on cloth?

• A. Alcohol
• B. Oxalic Acid Solution
• C. Kerosene Oil
• D. None of These

Explanation: Oxalic acid solution dissolves iron compounds in rust stains and is therefore used to remove them from cloth, with care because it is corrosive. Alcohol and kerosene are not suitable rust removers.

57. How many coloumns in the modern Periodic Table?

• A. 17
• B. 18
• C. 19
• D. None of these.

Explanation: The modern periodic table has 18 vertical columns called groups. The 18 groups organise elements with related outer-electron arrangements and chemical behaviour.

58. How many rows in the modern Periodic Table?

• A. 5
• B. 6
• C. 7
• D. None of these.Science

Explanation: The modern periodic table has seven horizontal rows called periods. Each period corresponds broadly to the filling of a principal electron shell.

59. Which metal is called "metal of hope"?

• A. Uranium
• B. Titanium
• C. Gold
• D. Platinum

Explanation: Uranium has been called the “metal of hope” because its nuclear energy potential was once viewed as a major future source of power. The nickname is not a reference to its colour or value like gold and platinum.

60. The Cow's Milk contains how much amount of water in terms of percentage?

• A. 60%
• B. 65%
• C. 72%
• D. 87%

Explanation: Cow’s milk is composed of roughly 87% water, with the remainder containing fat, proteins, lactose, minerals, and vitamins. Its exact composition varies slightly with breed and feeding.