Chemistry: Metals, Non-Metals, Metalloids and Noble Gases

An example of a NOBLE METAL is:

• Potassium (K)

• Copper (Cu)

• Platinum (Pt)

• Mercury (Hg)

In which geological formation is the most abundant metal in the Earth's crust commonly located?

• Minerals such as Magnesite and Dolomite

• Bauxite Ores

• Borax Ores

• Gypsum and Dolomite Ores

Corrosion in Copper (Cu) results in forming a ____ deposit of ____ when exposed to moist air.

(a)  

The Formula of RUST is:

• Fe2O3.xH2O

• Fe3O2.xH2O

• FeO3.xH2O

• Fe2O3.H2O

How can Iron Sheets be prevented from Rusting through Tinplating, considering that Tin is lower in the Reactivity Series compared to Iron?

• The Reactivity Series is not applicable in the case of Tinplating, as it follows a different set of rules.

• The melting point of Tin is higher than Iron, allowing it to coat Iron Sheets easily.

• Tin, despite its Lower Reactivity, forms a stronger bond with Iron due to its smaller atomic size.

• Iron Sheets are dipped into Molten Tin which provides a protective coating through Tinplating.

These are Medals plated with Gold (Au) and Silver (Ag) respectively. What process makes this possible?

• Galvanization

• Tarnishing

• Electrolysis

• Coating With Enamel

Select all the Elements that are Alloyed to form Stainless Steel.

• Chromium (Cr)

• Palladium (Pd)

• Aluminium (Al)

• Molybdenum (Mo)

What is employed in the production of Urea, Ammonia, and Explosives? Provide the Chemical Formula for Urea.

• Oxygen, NHCONH2

• Hydrogen, NH2CONH2

• Sulphur, NHCONH2

• Nitrogen, NH2CONH2

This Matchstick head is made up of Phosphorus (P). Why is Phosphorus, a Non-Metal used in Matchstick Heads that can ignite?

• Despite being a Non-Metal, it can Conduct Heat efficiently in Matchsticks.

• Phosphorus undergoes a Chemical Reaction with Friction on the Matchbox, causing ignition.

• Despite being a Non-Metal, it can Conduct Electricity efficiently in Matchsticks.

• It ignites through a Chemical Reaction with Atmospheric Oxygen.

What defines the process of Reduction? In which Element does it commonly occur?

• It is the Addition of Hydrogen. Hydrogen is used as a Reducing Agent.

• It is the Addition of Oxygen. Oxygen is used as a Reducing Agent.

• It is the Removal of Hydrogen. Oxygen is used as a Reducing Agent.

• It is the Removal of Oxygen. Hydrogen is used as a Reducing Agent.