Explanation

Fluorine is a halogen, a group of reactive nonmetals in Group 17 of the periodic table.

Other halogens include chlorine, bromine, iodine, and astatine.

Explanation

A moving car possesses kinetic energy due to its motion.

Kinetic energy depends on the mass and speed of the object.

Explanation

Polythene is a polymer made by linking many ethene (ethylene) monomers.

It is widely used in plastic bags and packaging materials.

Explanation

Water (H₂O) is a pure compound, not a mixture.

Tea, air, and alloys are mixtures of different substances.

Explanation

In a homogeneous solution, the particles are uniformly distributed and do not scatter light, allowing it to pass through easily.

Explanation

A dilute solution contains a relatively small amount of solute compared to the solvent.

This means the solute is less concentrated in the solution.

Explanation

Fe³⁺ (ferric ion) is yellow-brown.

When reduced to Fe²⁺ (ferrous ion), the solution typically shows a light green color.

Explanation

Dimitri Mendeleev arranged the elements in order of increasing atomic mass, creating the first widely recognized periodic table.

His arrangement helped predict properties of undiscovered elements and left gaps for them in the table.

Explanation

Dmitri Mendeleev, a Russian chemist, formulated the Periodic Table in 1869, arranging chemical elements according to their atomic number (number of protons in the nucleus) and chemical properties.

He organized the elements in a logical and systematic order.

This making it easier to predict their behavior and relationships.

Explanation

Citric acid is commonly found in citrus fruits like oranges and lemons.

Grapes contain small amounts, but mango is not a significant source of citric acid;

It contains more malic and tartaric acids instead.