Explanation

SN₂ reactions involve backside attack, which is hindered by steric effects.

Primary alkyl halides have least steric hindrance, making them ideal for SN₂.

Explanation

In the orthorhombic system:

All sides a ≠ b ≠ c

All angles α = β = γ = 90°

Other systems:

Cubic: a = b = c, α = β = γ = 90°

Rhombohedral: a = b = c, α = β = γ ≠ 90°

Hexagonal: a = b ≠ c, α = β = 90°, γ = 120°

Explanation

N₂O₅ (Dinitrogen pentoxide) is a molecular compound.

It contains covalent bonds between N and O atoms.

One of the N–O bonds is a coordinate (dative) bond, where both electrons come from oxygen.

Explanation

Cylinder has 5 dm³ at 10 atm → total “effective volume” at 1 atm = 50 dm³.

Each balloon takes 0.25 dm³ → 50 ÷ 0.25 = 200 balloons

Explanation

On heating, sodium nitrate (NaNO₃) undergoes thermal decomposition:

2NaNO₃ → 2NaNO₂ + O₂

It produces sodium nitrite (NaNO₂) and oxygen (O₂).

If the options allow only one product, NaNO₂ is considered the main product.

Explanation

Explanation

Evaporation is an endothermic process (absorbs heat from surroundings).

It is continuous and spontaneous under normal conditions.

It is not exothermic, since heat is absorbed, not released.

Explanation

Chromium (Z = 24) has the ground-state configuration: [Ar] 3d⁵ 4s¹.

It has one unpaired electron in the 4s-orbital.

Explanation

Reducing agents are compounds that donate electrons or get oxidized.

Aldehydes (C₂H₅CHO) can reduce other compounds and themselves get oxidized to acids.

Alcohols, ketones, and alkanes are generally less reducing under mild conditions compared to aldehydes.

Explanation

Locating agents are used to detect or visualize compounds on a medium (like paper or TLC).

Ninhydrin → detects amino acids.

Rubeanic acid → detects heavy metals like Cu²⁺, Ni²⁺.

H₂S → precipitates metal ions.

CS₂ is a solvent, not a locating agent.