Explanation

Maltose is not a macromolecule.

Explanation

Methanol (CH₃OH) is polar due to the presence of the highly electronegative –OH group and its bent geometry.

Other molecules like CO₂ and CCl₄ are non-polar because of their symmetrical shape, despite having polar bonds.

Explanation

The Born-Haber cycle is best example of Hess's law. 

The Born-Haber cycle uses the concept of Hess's law to calculate the lattice energy of an ionic compound by breaking down the formation of the compound into several smaller, easier-to-quantify steps

Explanation

Let the two charges be:

• $+q$ at one end

• $-q$ at the other end

• Distance between them = $2d$

• Midpoint = distance $d$ from both charges

The electric potential at a point due to a charge:

V= kq/r​

So, at the midpoint:

• Potential due to $+q$: +kq/ d​

• Potential due to $-q$: $-frac{kq}{d}$

Vnet​=kq/d​−kq​/d=0

Explanation

 In aromatic sulfonation, sulfur trioxide (SO3) is the actual attacking species, reacting with the aromatic ring to form a sulfonic acid. 

Explanation

A change in physical appearance or state of a substance, such as a change in shape, size, color, or phase (solid, liquid, gas), is called a Physical Change.

Explanation

Substitution reactions are given by alkanes whereas unsaturated hydrocarbons like alkenes and alkynes undergo addition reactions.

Explanation

• Ozone (O3) in the stratosphere absorbs ultraviolet radiation from the Sun.
• It preventing excessive heat from reaching the Earth's surface.

Explanation

Grignard reagent reacts with water to give alkane.

This is because Grignard reagent acts as a strong base that reacts with the active hydrogen of water that is -H of  H2O  to form alkane as shown below :

Explanation

‘He’ gas effuse from a hole of 10 dm^3 vessel in “5” seconds. The time for effusion of O2 from the same hole of 10 dm^3 will be 14.1 seconds.