Explanation

Tincture of iodine is iodine dissolved in alcohol (usually ethanol).

Alcohol acts as a solvent and helps iodine work as an antiseptic.

Explanation

A chemical property describes a substance’s ability to undergo a change that alters its chemical identity.

Examples include flammability, reactivity with acids, or ability to rust.

Explanation

A neutral solution (pH 7) does not affect litmus paper, so both red and blue litmus remain unchanged.

Litmus paper changes color only in acidic (red) or basic (blue) solutions.

Explanation

According to the law of conservation of mass, the total mass of reactants equals the total mass of products in a chemical reaction.

Since no atoms are lost or gained, the mass of Fe₂O₃ (product) remains 320 grams, the same as the reactants.

Explanation

Explanation

Carbon has a valency of 4, and Oxygen has a valency of 2.

By crossing the valencies, we get CO₂ (i.e., one carbon and two oxygen atoms), and the ratio simplifies to the empirical and molecular formula: CO₂.

Explanation

In soap-making (saponification), steam helps melt fats or oils, allowing them to react efficiently with caustic soda (NaOH).

This ensures the chemical reaction proceeds smoothly to form soap and glycerol.

Explanation

Barium is an alkaline earth metal, which is a group of elements in the periodic table that includes:

• Magnesium (Mg)
• Calcium (Ca)
• Strontium (Sr)
• Barium (Ba)
• Radium (Ra)

These elements are in group 2 (formerly group IIA) of the periodic table.

Explanation

• NaCl is also known as Sodium Chloride, or common table salt.
• It is a classic example of an ionic compound, where sodium (Na) loses an electron to become a positively charged ion (cation), and chlorine (Cl) gains an electron to become a negatively charged ion (anion).

Explanation

Sand, particularly silica sand (SiO₂), is the primary raw material used in glass making.

When heated to high temperatures, silica melts and forms glass upon cooling.