Explanation

Sulphur powder is commonly found as a bright yellow solid.

It is non-metallic.

It is used in medicines, fertilizers, and chemicals.

Explanation

In this reaction, two reactants (CaO and CO₂) combine to form a single product (CaCO₃).

This is the definition of a combination (or synthesis) reaction.

Explanation

Metals are opaque, meaning they do not allow light to pass through.

They are malleable (can be hammered into thin sheets) and lustrous (shiny in appearance).

Explanation

Valency is the number of electrons an atom can gain, lose, or share to achieve a stable configuration.

Carbon (C) has an atomic number of 6, with an electron configuration of 2,4.

It needs 4 more electrons to complete its outer shell (octet rule), so its valency is 4.

Explanation

Explanation

Explanation

Explanation

Bromine is one of the only two elements (along with mercury) that are liquid at room temperature.

The others listed are solid or gas under normal conditions.

Explanation

Let's calculate the number of protons, neutrons, and electrons for both atoms:

³¹₁₅P (Phosphorus)

•     Protons: 15
•     Neutrons: 31 - 15 = 16
•     Electrons (neutral atom): 15

³²₁₆S (Sulfur)

•     Protons: 16
•     Neutrons: 32 - 16 = 16
•     Electrons (neutral atom): 16

Both atoms have the same number of neutrons (16).

Explanation

Hydrochloric acid (HCl) reacts with Sodium hydroxide (NaOH) to form Sodium chloride (NaCl) and Water (H₂O) — a typical acid-base neutralization reaction.

The balanced equation is:

NaOH + HCl → NaCl + H₂O