Chemistry Concepts and Applications Quiz

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Questions and Answers

What is the maximum number of hydrogen bonds that a molecule of water can have?

3
2
1
4 (correct)

The bond angle in BCl3 is 120°.

True (A)

Which quantum number governs the spatial orientation of an atomic orbital?

Magnetic quantum number

In the Zeolite softening process, calcium and magnesium ions in water are precipitated as _______.

insoluble zeolites Signup and view all the answers

What is the pH range considered acceptable for drinking water?

6.5 to 8 (D) Signup and view all the answers

Match the following chemical processes or compounds with their corresponding uses:

Aluminum sulphate = Coagulation and flocculation in water treatment EDTA = Determination of water hardness Copper extraction = Self reduction from sulphide ore Benzene = Not used as an indicator Signup and view all the answers

Which chemical is usually added during the process of coagulation and flocculation?

Aluminum sulphate (C) Signup and view all the answers

Sodium ions contribute to the colour of the water.

False (B) Signup and view all the answers

Carborandum is commonly known as which of the following?

Silicon carbide (A) Signup and view all the answers

Natural rubber is a polymer of isoprene.

True (A) Signup and view all the answers

What is the gaseous fuel that is also a source of hydrogen?

water gas Signup and view all the answers

The viscosity index (VI) is a measure for the change of viscosity with change in __________.

Temperature Signup and view all the answers

Which compound is used for calculating the cetane number?

cetane (C) Signup and view all the answers

Match the following compounds with their correct applications or properties:

Graphite = Used as a lubricant Diamond = Does not conduct electricity Nylon 6 = Type of polyamide Acetic acid = pH less than 7 Signup and view all the answers

H2S is a liquid at room temperature, while H2O is a gas.

False (B) Signup and view all the answers

Write the electronic configuration of Chromium (Cr) which has atomic number 24.

[Ar] 3d5 4s1 Signup and view all the answers

What is a major disadvantage of using hard water in a boiler?

It helps in scaling. (D) Signup and view all the answers

All ores are minerals, and all minerals are ores.

False (B) Signup and view all the answers

What is the chemical composition of Portland cement?

Calcium silicates, calcium aluminates, and calcium ferrites. Signup and view all the answers

Bakelite is prepared by the process of ______.

polymerization Signup and view all the answers

Match the following concepts with their definitions:

Flash point = Lowest temperature at which vapors ignite Thermoplastics = Plastics that can be remolded Refractory = Materials resistant to high temperatures Carbon reduction = Method of extracting metals from ores Signup and view all the answers

What is the principle of Faraday's laws of electrolysis?

The amount of substance deposited is directly proportional to the electric charge passed. (C) Signup and view all the answers

A buffer solution maintains a constant pH regardless of the dilution.

False (B) Signup and view all the answers

Identify the oxidising agent and reducing agent in the reaction: KMnO4 + Na2SO3 + H2O → MnO2 + Na2SO4 + KOH.

Oxidising agent: KMnO4; Reducing agent: Na2SO3. Signup and view all the answers

Flashcards

Maximum Hydrogen Bonds in Water

The maximum number of hydrogen bonds a water molecule can form is 4 due to its two lone pairs and two hydrogen atoms.

Bond Angle of 120°

The compound with a bond angle of 120° is BCl3. This is because it has a trigonal planar geometry, with three bonding pairs and no lone pairs on the central boron atom.

Magnetic Quantum Number

The magnetic quantum number (ml) determines the spatial orientation of an atomic orbital in space. It describes the orbital's shape and how it interacts with other orbitals.