Boiling water removes: MCQ with Answer and Explanation

Boiling water removes:
A. Temporary hardness
B. All dissolved salts
C. Permanent hardness
D. Microorganisms only
Answer: Option A
Solution (By JKSSB Mock Tests)
Boiling precipitates Ca/Mg bicarbonates as carbonates, removing temporary hardness. It does not remove permanent hardness (sulfates/chlorides). It kills microbes but does not remove dissolved salts.

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Practice More chemistry Questions

Question #1
Which of the following does NOT involve a chemical change?
A. Making curd from milk
B. Fermentation of grapes
C. Evaporation of water
D. Souring of milk

Correct Answer: Option C


Explanation:
Evaporation of water is a physical change—liquid water changes to water vapor, but the chemical composition (H₂O) remains unchanged. Souring of milk and curd formation involve lactic acid bacteria converting lactose to lactic acid (chemical change). Fermentation of grapes involves yeast converting sugars to ethanol and CO₂. Chemical changes produce new substances. Physical changes only alter the state or form.

This question belongs to: Science chemistry
Question #2
Which allotrope of carbon is a good conductor of electricity?
A. Diamond
B. Charcoal
C. Buckminsterfullerene
D. Graphite

Correct Answer: Option D


Explanation:
Graphite conducts electricity due to delocalized electrons within its layers. Diamond is an insulator. Buckminsterfullerene (C₆₀) is a semiconductor but not as good a conductor as graphite in bulk; fullerene solids can be doped to become conductors. Charcoal is a poor conductor. Graphite electrodes are used in batteries and electrolysis.

This question belongs to: Science chemistry
Question #3
During electroplating of an iron spoon with silver, the anode is:
A. Silver rod
B. Iron spoon
C. Platinum
D. Graphite

Correct Answer: Option A


Explanation:
The silver rod dissolves (Ag → Ag⁺ + e⁻) at the anode, replenishing Ag⁺ in the electrolyte, which deposits on the iron spoon (cathode). Iron spoon remains intact.

This question belongs to: Science chemistry