Explanation

The phrase "hit someone on something"

Indicates that the action of hitting is directed at a specific part of the body or object.

In this case, "the bad touch" is considered as the target of the hitting action.

"On" is the preposition that denotes contact with something. 

Explanation

 Knocking causes incomplete combustion and inefficient engine performance, which reduces the efficiency of an engine.

Explanation

Reversible inhibitors, including both competitive and non-competitive inhibitors, form weak linkages with enzymes. 

Explanation

Friedrich Wöhler synthesized urea from ammonium cyanate in 1828, marking the birth of organic chemistry.

This experiment disproved the belief that organic compounds could only be made by living organisms.

Explanation

In the solid and liquid phase, AlCl₃ forms a bridged dimer structure: Al₂Cl₆, where two Al atoms are connected via chlorine bridges.

This happens because Al³⁺ seeks stability through coordinate bonding, leading to a bridge-type (dimeric) structure.

Explanation

Sound waves are mechanical vibrations that can disturb air particles around a candle flame.

This disturbance causes the flame to flicker due to pressure variations in the air.

Explanation

In most fungi, the nuclei are haploid (n) during the vegetative and asexual stages.

Diploid phase occurs briefly during sexual reproduction, followed by meiosis to restore haploidy.

Explanation

Friction always acts opposite to the direction of motion, resisting movement.

Since work = force × displacement × cos θ, and θ = 180°, cos 180° = –1, so work is negative.

Explanation

Explanation

The –SH group is present in thiols. 

A thiol is a functional group where a sulfur atom is bonded to a hydrogen atom.

The -SH group is analogous to the -OH group in alcohols, except that sulfur replaces oxygen.