Explanation

• Oxygen reacts with most elements to produce binary compounds called oxides.
• An oxide is a compound formed when oxygen combines with another element.
• Oxides may be metallic or non-metallic depending on the element involved.
• Examples include CO₂ (carbon dioxide), MgO (magnesium oxide), and Fe₂O₃ (iron oxide).
• Oxides can have acidic, basic, or amphoteric properties.

Last verified on 12-08-2026

Explanation

• Water (H₂O) and carbon dioxide (CO₂) combine to form carbonic acid (H₂CO₃).
• The reaction is: CO₂ + H₂O ⇌ H₂CO₃.
• Carbonic acid is a weak acid.
• It forms naturally when CO₂ dissolves in water.
• Carbonic acid contributes to the slightly acidic nature of rainwater.

Last verified on 11-08-2026

Explanation

• In forensic science, Chromatography is commonly used for identifying poisons, drugs, and other chemicals.
• It is a laboratory technique used to separate, identify, and analyze different substances in a mixture.
• It can help detect toxic substances in blood, urine, and other biological samples.

Last verified on 09-08-2026

Explanation

• A pH meter is an electronic instrument used to measure the acidity or alkalinity of a liquid solution by determining hydrogen-ion activity.
• Glass electrode: Senses hydrogen ions in the liquid.
• Reference electrode: Provides a stable electrical voltage.
• Meter display: Converts the voltage difference into a clear pH number

Explanation

• Gravimetric analysis is a quantitative analytical method.
• It determines the amount of an analyte by measuring its mass.
• The measured mass is used to calculate the amount of the original substance.