11. What is dry ice?

1. Solid Carbon dioxide
2. Solid Nitrogen dioxide
3. Solid Sulphur dioxide
4. Solid Water

Option “A” is correct
Dry ice, sometimes referred to as “cardice”, is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue. It is useful for preserving frozen foods where mechanical cooling is unavailable.
12. In which industry Potassium Nitrate is used commercially?

1. Glass Manufacturing
2. Electroplating
3. Fire Cracker Manufacturing
4. Leather Industry

Option “C” is correct
Potassium nitrate is one of the most used chemicals in fireworks. It is the oxidizing (oxygen-supplying) component of black powder which is the base for many pyrotechnic formulations.
13. Which of the following is not an example of Allotrope?

1. Diamond
2. Graphite
3. Ozone
4. Steel

Option “D” is correct
Diamond and Graphite are allotrope of Carbon while ozone is an allotrope of oxygen. Steel is an alloy of iron and carbon with trace amounts of other elements.
14. PET is a very familiar form of _____________. It is used for making bottles.

1. Nylon
2. Acrylic
3. Polyester
4. Rayon

Option “C” is correct
The majority of the world’s PET(Polyethylene terephthalate)production is for synthetic fibres and bottle production. In the context of textile applications, PET is referred to by its common name, polyester, whereas the acronym PET is generally used in relation to packaging.
15. What is nature of pH of Milk?

1. Slightly Acidic
2. Slightly Basic
3. Highly Acidic
4. Highly Basic

Option “A” is correct
Milk has a pH of around 6.5 to 6.7, which makes it slightly acidic.
16. Which among the following is not an example of emulsion?

1. Chocolate-Milk
2. Butter
3. Whipped Cream
4. Curd

Option “D” is correct
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Except Curd all other are example of emulsion.
17. What is the common name of CaOCl2?

1. Baking Powder
2. Baking Soda
3. Bleaching Powder
4. Washing Soda

Option “C” is correct
Calcium hypochlorite is an inorganic compound with formula CaOCl2. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent. Common name of CaOCl₂ is Bleaching Powder.
18. Which among the following is used to treat Indigestion?

1. Antacid
2. Antiseptic
3. Analgesic
4. Antibiotic

Option “A” is correct
An antacid is a substance which neutralizes stomach acidity, used to relieve heartburn, indigestion or an upset stomach.
19. Which of the following cannot be beaten into Sheets?

1. Gold
2. Silver
3. Potassium
4. Aluminum

Option “C” is correct
Potassium is highly reactive and rapidly oxidizes in air, so inspite of its property of malleability it cannot be beaten into sheets.
20. Minamata disease is a nervous disorder caused by eating fish, polluted with _____ .

1. Iron
2. Mercury
3. Lead
4. Nickel

Option “B” is correct
Minamata disease is a poisoning disease that affects mainly the central nervous system and is caused by the consumption of large quantities of fish and shellfish contaminated with mercury.