Test: Law of Inertia & Friction (June 3) - NEET MCQ

The term inertia was first used by Galileo.

Inertia means resistance to change. It is the property of the body by virtue of which it cannot change by itself its state of rest or of uniform motion.

A passenger getting down from a moving bus falls in the direction of the motion of the bus. This is because his feet come to rest on touching the ground an the remaining body continues to move due to inertia of motion.

In uniform translatory motion, all parts of the ball have the same velocity in magnitude and direction and this velocity is constant.

When the speeding bus stops suddenly, the lower part of the passengers’s body in contact with the seat remains at rest whereas the upper part of the body of the passengers continues to be in state of motion due to inertia. Hence, the passengers are thrown forward.

F, O and N are electronegative elements. Thus, HF molecules are associated by intermolecules H-bonding giving it a liquid state and thus highest boiling point out of HF, HCl.HBr and HI.
Similarly, H₂O has highest boiling point, and NH₃ has highest boiling point.

A hydrogen bond is a weak type of force that forms a special type of dipole-dipole attraction which occurs when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons.
F is the most electronegative atom. Hence hydrogen bond is shortest in F - H ........F.

CH₃CH₂OH is in liquid state due to association as a result of intermolecular H-bonding.

One water molecule is directly attached to four water molecules. Thus, coordination number of water is 4.

HCI: EN of Cl is smaller, hence less polar than HF.
CH₄ :non-polar
CH₃COO^- : H attached to C-atom is non-polar hence
HCI, CH_4, CH₃COO^- — lack H-bonding.