Free Chemistry in Daily Life MCQs with Answers

241. Why are soft drink made with chilled water rather than water at room temperature?

• A. Ingredients dissolve better in chilled water
• B. Chilled water enhances the taste
• C. Chilled water attracts more carbon dioxide
• D. Chilled water is more hygienic

Explanation: Carbon dioxide is more soluble in cold water than in warm water, so chilled water retains more dissolved gas and makes a soft drink more highly carbonated. Chilling also improves taste, but greater CO2 solubility is the scientific reason.

242. The major component of honey is_________?

• A. Glucose
• B. Surcose
• C. Maltose
• D. Fructose

Explanation: Honey contains mostly simple sugars, with fructose usually making up the largest share, followed by glucose. Sucrose and maltose occur only in much smaller amounts.

243. What is the symbol of Gold?

• A. Ag
• B. Au
• C. S
• D. None

Explanation: Gold has the symbol Au, derived from its Latin name aurum. Ag is silver, while S is sulfur.

244. Iodised salts contains the iodine salts of which metal?

• A. Iodine
• B. Potassium
• C. Sodium Chloride
• D. Chlorine

Explanation: Common iodised salt is supplemented with potassium iodide or potassium iodate, so the relevant metal is potassium. Sodium chloride is the main salt itself, not the iodine-containing additive.

245. How many rows and columns are in the modern Periodic Table?

• A. 18 columns and 7 rows
• B. 12 columns and 9 rows
• C. 7 columns and 18 rows
• D. 25 columns and 15 rows

Explanation: The modern periodic table has 18 vertical columns called groups and 7 horizontal rows called periods. Thus the correct arrangement is 18 columns and 7 rows.

246. What are rows in Periodic table called?

• A. Period
• B. Group
• C. Verticals
• D. Perpendiculars

Explanation: Horizontal rows in the periodic table are called periods because they represent successive principal electron energy levels. Vertical columns are called groups.

247. What are Columns in Periodic table called?

• A. Period
• B. Group
• C. Verticals
• D. Perpendiculars

Explanation: Vertical columns are called groups, and elements within a group often have similar chemical properties because they have related outer-electron arrangements. Horizontal lines are periods.

248. Which of the following is used in Pencils?

• A. Graphite
• B. Silicon
• C. Charcoal
• D. Phosphorous

Explanation: Pencil cores are made mainly from graphite mixed with clay; graphite is a soft form of carbon that leaves a mark on paper. The core is not made from silicon, charcoal or phosphorus.

249. Which of the following is a Non Metal that remains Liquid at room temperature?

• A. Phosphorous
• B. Bromine
• C. Chlorine
• D. Helium

Explanation: Bromine is a non-metal that is liquid at ordinary room temperature, with its reddish-brown vapour giving it a distinctive appearance. Chlorine is a gas, while phosphorus and helium are not room-temperature liquids.

250. Which one of the following is also called Stranger Gas?

• A. Neon
• B. Argon
• C. Xenon
• D. Nitrous oxide

Explanation: Xenon is called a “stranger gas,” derived from the Greek word xenos meaning stranger or foreigner. It is also a chemically inert noble gas.