Explanation

When you say so, I must take it seriously.

"Seriously" is the correct adverb form to modify the verb "take".

Explanation

The phrase "at present" indicates an action happening right now, so present continuous tense is needed.

"Is reading" correctly shows the ongoing action with the subject 'She'.

Explanation

In the sentence, 'light' describes the noun 'affair', showing it's not serious—hence, it's an adjective.

Adjectives modify nouns to give more information about their quality or nature.

Explanation

Zingiber officinale is the scientific name for ginger.

It is a commonly used spice and medicinal root.

It belongs to the Zingiberaceae family and grows as an underground stem (rhizome).

Explanation

Funaria is a moss, and mosses belong to the class Bryopsida.

It is a non-vascular, spore-producing plant typically found in moist, shady places.

Explanation

Euphoria (likely meant Euphorbia) is mostly a xerophyte, adapted to dry conditions, not water.

Lotus, Victoria, and Hydrilla are all hydrophytes, adapted to live in or on water.

Explanation

Detritus food chain starts with dead organic matter (detritus), including decaying plant material.

Decomposers (like fungi, bacteria) and detritivores (like earthworms) feed on this material, converting it into simpler substances.

Explanation

Barium (Z = 56) → Electron configuration:

[Xe]6s²

Barium's electron distribution:

• K = 2
• L = 8
• M = 18
• N = 18 ⬅ Penultimate shell (4th shell / N-shell)
• O = 8 (valence shell)

The penultimate shell (N-shell) holds 18 electrons in Barium.

Explanation

Step 1: Calculate the molar mass of S8

The atomic mass of sulfur (S) is approximately 32 g/mol. The molar mass of S8 = 8 * 32 = 256 g/mol.

Step 2: Calculate the number of moles of S8

Number of moles = mass of S8 / molar mass of S8 = 64 g / 256 g/mol = 0.25 mol.

Step 3: Calculate the number of molecules of S8

Number of molecules = number of moles * Avogadro's number (NA) = 0.25 * NA.

Step 4: Calculate the number of sulfur atoms

Each molecule of S8 contains 8 sulfur atoms. Therefore, the total number of sulfur atoms = 8 * number of molecules = 8 * 0.25 * NA = 2 * NA = 2NA.

Explanation

Given reaction:

NO(g) + CO₂(g) ⇌ NO₂(g) + CO(g)

Initial moles:

NO = 4 mol

CO₂ = 0.9 mol

NO₂ = 0

CO = 0

At equilibrium:

CO₂ = 0.1 mol

→ So, change in CO₂ = 0.9 - 0.1 = 0.8 mol consumed

→ Therefore, 0.8 mol of NO also reacted

→ 0.8 mol each of NO₂ and CO formed

Equilibrium moles:

NO = 4 - 0.8 = 3.2 mol

CO₂ = 0.1 mol

NO₂ = 0.8 mol

CO = 0.8 mol

Equilibrium expression:

K = [NO2][CO]/[NO][CO2] = (0.8)(0.8)/(3.2)(0.1) = 0.64/0.32 = 0.2