Explanation

Low ionization energy allows atom A to easily lose an electron (form a cation).

High electron affinity enables atom B to easily gain that electron (form an anion), leading to ionic bond formation.

Explanation

Let the atomic mass of M = x.

Total mass of MH₃ = x + 3(1) = x + 3

x/x + 3 = 0.90

→ x = 0.9x + 2.7

→ 0.1x = 2.7

→ x = 27

Hence, the relative atomic mass of M is 27.

Explanation

Acetone and chloroform are polar molecules that attract each other through dipole–dipole forces.

This polarity allows them to mix easily, making them mutually soluble.

Explanation

PPM means parts per million = (mass of solute / mass of sample) × 10⁶

= (0.2 / 500) × 10⁶

= 0.0004 × 10⁶ = 400 ppm

So, the fluoride concentration is 400 ppm.

Explanation

In the ozone (O₃) molecule, atoms are linked by covalent bonds and one coordinate (dative) bond.

One oxygen donates a lone pair to bond with another, giving the molecule resonance stability.

Explanation

Liquefied Petroleum Gas (LPG) is primarily a mixture of propane (C3H8) and butane (C4H10).

These gases are compressed and liquefied for easy storage and transport.

Explanation

Tannic acid is used in making blue-black inks, especially iron gall ink.

It reacts with iron salts to produce a dark color suitable for writing.

Explanation

When the soap is in the form of micelles then it has the ability to clean the oily dirt which gets accumulated at the centre.

These micelles remain as colloidal solutions.

Therefore, the dirt from the cloth is easily washed away.

Explanation

When hot water is turned on, steam (water vapor) cools upon touching the cold glass surface.

This cooling turns vapor into tiny water droplets — a process called condensation.

Explanation

Lanthanides are a series of chemical elements with atomic numbers from 58 (Cerium) to 71 (Lutetium).

Cerium (Ce) has an atomic number of 58, making it the first element in the lanthanide series.