The term PVC used in the plastic industry stands forA) Polyvinyl chloride B) Polyvinyl carbonateC) Phosphors vanadium Chloride D) Polyvinyl carbocarbonate2- The material that can be deformed permanently by heat and pressure iscalled aA) Polymer B) ThermoplasticC) Chemical Compound D) Thermoset3- Valency of Hydroxide ion (OH) isA) -1 B) -2C) -3 D) 14- Atmosphere contains dust particles, salt grains, pollen grains, smoke,etc. which are collectively known as :A) Water vapour B) OzoneC) Aerosols D) CFC5- The Formula of Sodium Hydroxide isA) Na(OH)2 B) NaOHC) Na2(OH)3 D) Na2OH

1- The term PVC used in the plastic industry stands for A) Polyvinyl chloride. PVC is an abbreviation for Polyvinyl Chloride, a type of plastic that is widely used in the construction industry.

2- The material that can be deformed permanently by heat and pressure is called a B) Thermoplastic. Thermoplastics are a type of polymer that become pliable or moldable at a certain elevated temperature and solidify upon cooling.

3- Valency of Hydroxide ion (OH) is A) -1. The valency of an ion is equal to its charge. The hydroxide ion (OH) has a charge of -1, so its valency is -1.

4- Atmosphere contains dust particles, salt grains, pollen grains, smoke, etc. which are collectively known as C) Aerosols. Aerosols are a suspension of fine solid particles or liquid droplets in air or another gas.

5- The Formula of Sodium Hydroxide is B) NaOH. Sodium Hydroxide is a strong base and its chemical formula is NaOH.