Explanation

As this diagram shows, pH ranges from 0 to 14, with 7 being neutral.

pH less than 7 are acidic.

pH greater than 7 are alkaline.

Explanation

Helium (He) is a noble gas.

Its atoms do not naturally bond with each other under standard conditions.

It exists as monoatomic (single-atom) molecules.

Nitrogen (N₂), Oxygen (O₂), and Hydrogen (H₂) are diatomic molecules.

It means they naturally form bonds between two atoms of the same element.

Explanation

A concentrated solution has a large amount of solute dissolved in a given quantity of solvent.

It is the opposite of a dilute solution, which contains a small amount of solute.

Explanation

They do not perform Baeyer's Test statement is not true because alkynes do perform Baeyer's Test, which detects unsaturation (like double or triple bonds).

In Baeyer's Test, potassium permanganate gets decolorized if alkynes are present, indicating a reaction.

Explanation

Polyester is made from Polyethylene Terephthalate (PET), a synthetic polymer.

It is widely used in fabrics, plastic bottles, and packaging materials.

Explanation

Explanation

• Organic chemistry is the branch of chemistry that deals with hydrocarbons and their derivatives.
• They are compounds containing carbon and hydrogen atoms.
• It may also contain other elements like oxygen, nitrogen, and sulfur.

Explanation

To prepare 250 cm³ (or 250 mL) of a 1 M NaOH solution, you need 10 grams of NaOH.

This is because the molar mass of NaOH is 40 g/mol, and a 1 M solution contains 1 mole of solute per liter of solution.

Therefore, 250 mL (0.25 L) of a 1 M solution would require 0.25 moles of NaOH, which translates to 10 grams (0.25 moles * 40 g/mol). 

Explanation

Explanation

CaCO₃ (Calcium carbonate)

No, it is not hygroscopic.

It does not absorb moisture significantly → NOT a desiccating agent