Explanation

To find the equilibrium constant (Kc) for the reaction H₂ (g) + I₂ (g) ⇌ 2HI (g), we use the formula:

Kc = [HI]² / [H₂] [I₂]

Given concentrations:

[HI] = 0.08 mol/dm³

[H₂] = 0.04 mol/dm³

[I₂] = 0.04 mol/dm³

Kc = (0.08)² / (0.04 × 0.04)

= 0.0064 / 0.0016

= 4

Explanation

The d subshell has 5 orbitals, each can hold 2 electrons, so total 10 electrons.

This is standard in electron configuration rules in chemistry.

Explanation

The formula to calculate max electrons in an orbit is 2n², where n = orbit number.

1st orbit (n = 1): 2 × 1² = 2 electrons

2nd orbit (n = 2): 2 × 2² = 8 electrons

For the 3rd orbit (n = 3): 2 × 3² = 18 electrons

Explanation

In this reaction, element C displaces B from compound AB, forming A + BC.

Such reactions are classified as single displacement or single replacement reactions.

Explanation

Lactobacillus bulgaricus is a lactic acid bacterium used primarily in the fermentation of milk to produce yogurt.

It works alongside Streptococcus thermophilus to convert lactose into lactic acid, giving yogurt its texture and tangy flavor.

Explanation

The choroid is a layer full of blood vessels that supply oxygen and nutrients to the eye.

It lies between the retina and the sclera.

Explanation

Compassionate means showing kindness, care, and a desire to help others.

Sympathetic means showing understanding and care for someone else's suffering.

Compassionate means شفقت ، نگہداشت ، اور دوسروں کی مدد کرنے کی خواہش ظاہر کرنا

Sympathetic means کسی اور کی تکلیف کی تفہیم اور دیکھ بھال کرنا

Explanation

A polyprotic acid is an acid that can donate more than one proton (H⁺) per molecule.

1. H₃PO₄ (Phosphoric acid) → Triprotic acid (can donate 3 H⁺ ions)
2. HCN (Hydrocyanic acid) → Monoprotic (donates only 1 H⁺)
3. HCl (Hydrochloric acid) → Monoprotic

Explanation

Ferrum is the Latin name for iron, which is why its chemical symbol is Fe.

It is a transition metal used widely in construction.

It is essential in the human body for forming hemoglobin.

Explanation

The pons controls facial expressions, eye movement, and some sensory roles.

It serves as a communication bridge between different parts of the brain.