Which one of the following forms of phosphorus is most reactive?

• Black phosphorus

• White phosphorus

• Violet phosphorus

• Violet phosphorus

Inert gases are

• Miscible with water

• Not stable

• Chemically unreactive

• Chemically unreactive

Magnesium is a constituent metal of

• Chlorophyll molecule

• DNA

• Mitochondria

• Mitochondria

Phosphorus is kept in water because

• its ignition temperature is very high

• its ignition temperature is very low

• its critical temperature is high

• its critical temperature is high

Chemical name of vinegar is

• Acetone

• Acetic acid

• Formaldehyde

• Formaldehyde

Calcium salts used as fertilizers is

• Calcium Carbide

• Calcium Carbonate

• Calcium Cyanide

• Calcium Cyanide

Which of the following is used as anesthetics?

• N₂

• N₂O

• CH₄

• CH₄

Name the gas used in the preparation of bleaching powder.

• Oxygen

• Hydrogen

• Nitrogen

• Nitrogen

The commonly used coolant in refrigerators is

• Ammonia

• Nitrogen

• Freon

• Freon

What causes the mottling of the dental enamel?

• High levels of chlorine in the water

• High levels of nitrate in the water

• High levels of fluorides in the water

• High levels of fluorides in the water