Explanation

• - Iodine (I₂) is non-polar.
• - Slightly soluble in water.
• - More soluble in alcohol and petrol.
• - Follows the principle: Like dissolves like.
• Iodine solution in alcohol is called tincture of iodine.
• Iodine vapours are violet in colour.
• Iodine is a solid at room temperature

 Last updated on 12 NOV 2026

Explanation

Substances that do not normally sublime

• - Glucose: Decomposes on heating.
• - Sodium chloride: Does not sublime under ordinary laboratory conditions.

Additional information:

• Iodine: Sublimes on heating.
• Camphor: Sublimes easily.

 Last updated on 12 NOV 2026

Explanation

• A neutron has no electric charge, so it is electrically neutral.

Additional information:

• A proton has a positive charge (+1).
• An electron has a negative charge (−1).

Last verified on 07-10-2026

Explanation

• Zinc (Zn) is located in Group 12 and Period 4 of the periodic table.
• Its atomic number is 30.
• It is commonly classified as a transition metal in standard educational curricula because it belongs to the d-block.
• Zinc is used in galvanization to protect iron and steel from rusting.

Last verified on 09-11-2026

Explanation

• Calcium (Ca) is an alkaline earth metal belonging to Group 2 of the periodic table.
• Its atomic number is 20.
• Mercury (Hg) is a liquid metal at room temperature.
• Its atomic number is 80.
• Mercury has a boiling point of approximately 356.7°C.

Last verified on 09-11-2026