Explanation

The -NH₂ group is an electron-donating substituent that releases electrons to the benzene ring through resonance.

It increasing the electron density on the ring.

Explanation

The principle that states that if a stress is applied to a system at equilibrium, the system will nullify the effect of the stress as far as possible is known as Le Chatelier's principle.

This principle helps predict how a change in conditions (like concentration, temperature, or pressure) will affect the position of equilibrium in a chemical reaction.

Explanation

Temporal bones are included in the paired cranial bones.

Unlike the frontal, vomer, and occipital bones, which are single.

The temporal bones exist in pairs (one on each side of the skull).

Explanation

The chromosomes were first observed by Walther Flemming.

He used a microscope to study cell division and identified chromosomes during mitosis in the late 19th century.

Explanation

Acetylcholine is the neurotransmitter lying outside the central nervous system.

It plays a key role in transmitting signals between nerves and muscles in the peripheral nervous system.

Explanation

The incorrect statement is "Have higher wavelength than visible light."

X-rays actually have a shorter wavelength than visible light.

This making them more energetic and highly penetrating, especially in soft body tissues.

Explanation

The potential through which an electron should be accelerated to lift an atom's electron from the ground state to a higher state is known as excitation potential.

This energy excites the electron without completely removing it from the atom.

Explanation

When the velocity increases by 2 times and the radius increases by 4 times, the centripetal force remains the same.

This is because the increase in velocity squared (2^2 = 4) is balanced by the increase in radius (4r), resulting in no net change in the centripetal force.

So, the correct answer is:

F' = F

Explanation

Volt x Ampere is the measure of power.

Specifically, it represents electrical power in watts (W), where power (P) is calculated using the formula 

P=V×I, with V being voltage and I being current.

Explanation

In graphite, the carbon atoms are arranged in a hexagonal structure.

Each carbon atom forms three sigma bonds in a planar arrangement.

It creating layers of hexagonally arranged carbon atoms that can slide over one another.

It contributing to graphite's lubricating properties.