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Questions and Answers
What is the main purpose of painting an iron grill?
What is the main purpose of painting an iron grill?
- To decrease the weather resistance
- To protect it from corrosion (correct)
- To improve its beauty and appearance
- To reduce its life and durability
What must a good paint have?
What must a good paint have?
- High covering power
- Brushing characteristics light
- Reflecting property
- All of the above (correct)
What is varnish used for?
What is varnish used for?
- Fire-resistant finish
- Opaque finish
- Transparent finish (correct)
- Red colour finish
What is the composition of paint that provides the hiding power?
What is the composition of paint that provides the hiding power?
Which constituent acts as a thinner in paint?
Which constituent acts as a thinner in paint?
What are thinner added to paint for?
What are thinner added to paint for?
What common constituent do paint and oil varnish both contain?
What common constituent do paint and oil varnish both contain?
Insulators are used for?
Insulators are used for?
Which statement is true for insulators?
Which statement is true for insulators?
Which materials would be safest to use as insulators to cover electrical wires?
Which materials would be safest to use as insulators to cover electrical wires?
Copper wire is often wrapped in plastic. Plastic is a good conductor.
Copper wire is often wrapped in plastic. Plastic is a good conductor.
Glass wool is made up of filaments of ________.
Glass wool is made up of filaments of ________.
Match the following polymer with its commercial name:
Match the following polymer with its commercial name:
A molecule is formed by chemical bond when -----------------------
A molecule is formed by chemical bond when -----------------------
Crystal lattice is actually -------------------
Crystal lattice is actually -------------------
Lattice energy is decreased when size of anion is -----------------------
Lattice energy is decreased when size of anion is -----------------------
The substance which decreases the efficiency of a catalyst is known as -----------
The substance which decreases the efficiency of a catalyst is known as -----------
Polyethylene & Polypropylene formation is catalyzed by -------------
Polyethylene & Polypropylene formation is catalyzed by -------------
Which of the following is a polar covalent bond?
Which of the following is a polar covalent bond?
Nitrogen molecule is formed by mutual sharing of electrons are --------
Nitrogen molecule is formed by mutual sharing of electrons are --------
Point which shows the position of atoms in a crystal are called-------------
Point which shows the position of atoms in a crystal are called-------------
Co-ordination number of face-centered cubic close packing is
Co-ordination number of face-centered cubic close packing is
Electron sea exists in--------------
Electron sea exists in--------------
The loss & gain of electrons from an atom of an element forms a bond known as?
The loss & gain of electrons from an atom of an element forms a bond known as?
What is the arrangement of eight electrons in the outermost shell of an atom called?
What is the arrangement of eight electrons in the outermost shell of an atom called?
What is the electronic configuration of Sodium (Na)?
What is the electronic configuration of Sodium (Na)?
Ions possess a charge that depends on the loss and gain of which of the following?
Ions possess a charge that depends on the loss and gain of which of the following?
The valency obtained by gaining valence electrons is called?
The valency obtained by gaining valence electrons is called?
What type of compounds generally have a high melting point?
What type of compounds generally have a high melting point?
Which molecule is a polar molecule?
Which molecule is a polar molecule?
What is another name for a dative bond?
What is another name for a dative bond?
Which of the following is a crystal solid?
Which of the following is a crystal solid?
Non-metal atoms borrow electrons to form what?
Non-metal atoms borrow electrons to form what?
When only one atom provides the electron to form a bond, it is called a?
When only one atom provides the electron to form a bond, it is called a?
An example of natural adhesive used in stamps, envelops, etc. is:
An example of natural adhesive used in stamps, envelops, etc. is:
Adherends means:
Adherends means:
Which of the following is not a natural adhesive?
Which of the following is not a natural adhesive?
Adhesive used for bonding metal is:
Adhesive used for bonding metal is:
Which of the following give least adhesive strength?
Which of the following give least adhesive strength?
Adhesive used for bonding glass, metals, ceramics is:
Adhesive used for bonding glass, metals, ceramics is:
Graphite is which type of lubricant:
Graphite is which type of lubricant:
Lubricating helps to:
Lubricating helps to:
Viscosity index is a measure for change of viscosity with change in:
Viscosity index is a measure for change of viscosity with change in:
A liquid lubricant should possess high:
A liquid lubricant should possess high:
Grease is not used to lubricate:
Grease is not used to lubricate:
A good lubricant should have:
A good lubricant should have:
Soap, stone, waxes, talc are examples of:
Soap, stone, waxes, talc are examples of:
Which one is a synthetic lubricant?
Which one is a synthetic lubricant?
Which one is not a vegetable oil?
Which one is not a vegetable oil?
Grease is prepared by saponification of:
Grease is prepared by saponification of:
Study Notes
Chapter 4: Chemical Bonding and Catalysis
- Chemical bonding involves the loss and gain of electrons to form bonds.
- Types of bonds:
- Covalent bond: formed by sharing of electrons between atoms.
- Electrovalent bond: formed by complete transfer of electrons between atoms.
- Coordinate bond: formed by donation of electrons from one atom to another.
- Catalysis: process of increasing the rate of a chemical reaction without being consumed by the reaction.
- Types of catalysis:
- Homogeneous catalysis: catalyst is in the same phase as the reactants.
- Heterogeneous catalysis: catalyst is in a different phase from the reactants.
- Enzymatic catalysis: biological molecules that speed up chemical reactions.
Chapter 5: Metal Corrosion, its Prevention, and Electrochemistry
- Corrosion: destruction of metal due to chemical reaction with the environment.
- Factors affecting corrosion:
- Presence of moisture and oxygen.
- pH of the environment.
- Presence of impurities.
- Prevention of corrosion:
- Cathodic protection: attaching a more reactive metal to an iron object to act as an anode.
- Sacrificial protection: using a more active metal to corrode instead of the iron object.
- Galvanizing: coating iron with a layer of zinc to prevent corrosion.
- Electrochemical series: a list of metals in order of their reactivity.
- Galvanic cell: an electrochemical cell that generates electricity through the corrosion of metal.
Other Key Concepts
- Crystal lattice: a three-dimensional arrangement of points in a crystal.
- Lattice energy: the energy required to separate the ions in a crystal lattice.
- Ionic bond: formed by the transfer of electrons between atoms to form ions.
- Covalent bond: formed by sharing of electrons between atoms.
- Electrolysis: the process of separating ions in a solution using an electric current.Here are the study notes for the provided text:
- Corrosion*
- Sacrificial anodic metal: Zinc
- Volatile oxide corrosion product of metal: MoO3
- Standard electrode potential of Zn2+/Zn: -0.76V
- Standard electrode potential of hydrogen: 0.00V
- Zinc is more electropositive than iron
- Metals that form unstable metal oxides: Cr, Na, Ag, Mo
- Passivity is due to the formation of an adhering oxide film
- Galvanic Cells*
- Primary cell: Alkaline cell or Laclanche cell
- Coating of Zn, Al, & Cd on steel: Cathodic
- Oxygen absorption mechanism of metal is observed in: Acidic, basic, and neutral medium
- Metal at the bottom of galvanic series: Most active
- Strong electrolyte: HCl, HNO3, H2SO4
- Electrolysis*
- 1 Faraday: 96500 Coulomb
- Electro refining of metal: Purification of metal
- Process of coating one metal on another metal by electrolysis: Electroplating
- Coating of Tin on iron by hot dipping process: Tinning
- Numericals*
- Calculate electrochemical equivalent and chemical equivalent of copper
- Calculate time in seconds in which 0.3 gm of copper is liberated
- Calculate the equivalent weight of metal
- Calculate the strength of the current
- Paints and Varnishes*
- Purpose of painting an iron grill: To protect it from corrosion
- A good paint must have: High covering power, brushing characteristics, light reflecting property
- Constituents of paint: Fillers, pigment, drying oil
- Varnish is used to give: Transparent finish
- Thinner is added to paint to: Reduce the consistency
- Insulators*
- Insulators are classified on the basis of: Manufacturing, state of occurrence, application
- Materials used as insulators: Glass wool, thermocole, asbestos, iron
- Properties of insulators: Low thermal conductivity, low electrical conductivity
- Good thermal insulators should have: Low thermal conductivity
- Polymers and Monomers*
- Polyethylene is formed by: Polymerization
- Types of polymerization: Addition, condensation
- Structural unit of a high polymer: Monomers
- Commercial name of phenol-formaldehyde resin: Bakelite
- Bakelite is prepared by the condensation of: Phenol and formaldehyde
- Bakelite is a cross-link polymer
- Adhesives*
- Adhesive is a substance used: For sticking two unlike bodies together
- Example of vegetable glue: Soybean glue
- Example of inorganic adhesive: Sodium silicate
- Araldite is a: Thermosetting resin
- Natural adhesive used in stamps, envelops, etc.: Gum
- Lubricants*
- Graphite is a: Solid lubricant
- Lubricating helps to: Minimize wear in moving parts
- Viscosity index is a measure of change of viscosity with change in: Temperature
- A liquid lubricant should possess: High oiliness, moderate viscosity### Types of Oils
- Tallow oil, coconut oil, olive oil, and palm oil are examples of different types of oils.
Preparation of Grease
- Grease is prepared by a process called saponification.
- Saponification involves the use of oil, not solid lubricants or fatty acids with oil.
- Oil is the primary component used in the preparation of grease.
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Description
This quiz covers types of adhesives, their uses, and terminology related to adhesion. Questions include examples of natural adhesives and explanations of adhesive-related terms.
