can u plz tell me this its too urgent
Answers
Answer:
14) Assertion is false but reason is true.
15) Assertion is true but reason is false.
Explanation:
14 - assertion is true because Covalent bond have weak intermolecular forces, that is to say, the forces between molecules is very weak. The consequence of this, is that it becomes easy to move individual molecules away from other molecules as the bonding between molecules is weak, hence it needs little energy to break. Since temperature is proportional to energy, that means the temperature required to melt the compound is low.
reason is some times true C ovalent bonds do not dissolve in water, but some covalent compounds do.
Covalent molecules are attracted to each other by various intermolecular forces such as H-bonds, dipole-dipole forces, and London dispersion forces. Water molecules are attracted to each other by strong H-bonds.
A polar solute may be attracted to the water molecules as strongly as the water molecules are attracted to each other.
It should contain a highly electronegative atom such as N or O or, even better, an N-H or an O-H bond, because they can form H-bonds to the water molecules. It will then be able to work its way among the water molecules (dissolve).
Sugar and ethanol are covalent compounds that are soluble in water, because they contain O-H groups that can H-bond to the water.
15 - assertion is true because of biodegration - Biodegradation is the breakdown of organic matter by microorganisms, such as bacteria and fungi.
reason is false beceause bio degradeable wastes are generally organic wastes.
