Questions

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Examples of compounds with covalent bonds ::

HCl, CO2, O2,... 

Enzymes in the body are those which play an important role of breaking down the larger molecules to small and speeds up the chemical reactions.

West Bengal state government will observe Rosogolla Day on November 14 2018 to commemorate the first anniversary of the state’s famous sweet getting Geographical Indication (GI) tag as 'Bengal’s Rosogolla'.

In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.