121.

Which of the following is not an example of Allotrope?

• Diamond

• Graphite

• Ozone

• Steel

What is the common characteristic of the elements of the same group in the periodic table?

• Electrons in outermost shell

• Total number of electrons

• Total number of protons

• Atomic weight

What is an exothermic reaction?

• Reaction in which heat is released.

• Reaction in which heat is absorbed.

• Reaction in which neither heat it released nor absorbed.

• None of the above.

What are the main components of Brass Alloy?

• Copper and Zinc

• Copper and Strontium

• Copper, Zinc and Nickel

• Copper and Nickel

What is the common name of Sodium Bicarbonate?

• Baking Soda

• Washing Powder

• Plaster of Paris

• Fly Ash

Which of the following is an ore of iron?

• Dolomite

• Epsom Salt

• Siderite

• Galena

What is the process of conversion of solid state directly to gaseous state called?

• Evaporation

• Condensation

• Sublimation

• Distillation

Which of the following is a chemical formula of quicklime?

• Ca₂O

• Ca₂CO₃

• CaO₂

• CaO

Supercooling is cooling of liquid............

• below melting point

• below freezing point

• at melting point

• above melting point

Which of the following is also known as Carbolic Acid?

• Phenol

• Hydroxide

• Sulphuric Acid

• Ethanol