Explanation

Energy is carried by Stationary Wave. 

 Violet light has highest energy. 

Explanation

Oxyacetylene welding, commonly referred to as gas welding,

is a process which relies on combustion of oxygen and acetylene

Explanation

Diamond is composed of a single element of carbon

It is the arrangement of the C atoms in the lattice

Diamond is a solid form of pure carbon with its atoms arranged in a crystal.

Explanation

Joseph Priestly discovered oxygen on August 1, 1774.

The most abundant element in the Earth's crust is oxygen, making up 46.6% of Earth's mass

Explanation

The initial setting of cement is caused by:

• Hydration of Tricalcium Aluminate (C₃A).
• Reaction of C₃A with water, which starts rapidly after mixing.
• Formation of calcium aluminate hydrates, causing the paste to stiffen.
• Gypsum is added to slow down this reaction and prevent flash setting.

Explanation

• Cleavage is a natural plane of weakness in a stone.
• A stone tends to split along its cleavage direction.
• Cleavage is caused by the internal structure of the mineral.

Explanation

Benzene is an organic compound.

Molecular formula C3H3.

A benzene molecule is composed of six carbon atoms connected to a planar ring, each with a hydrogen atom.

Benzene is classified as a hydrocarbon because it contains only carbon and hydrogen atoms.

Empirical  Formula: C6H6

Explanation

When cream is separated from the milk,  the density of the milk increases.

Explanation

• The father of Modern Chemistry is known as Antoine Lavoisier 
• 1743 → Born in Paris, France
• 1770s → Began major experiments on combustion
• 1789 → Published Elementary Treatise of Chemistry
• 1794 → Died during the French Revolution

Last updated by NA on 23-April-2026