Tag: chemical bonding and structure

Quizzes (8) Questions (141)

Questions Related to chemical bonding and structure

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

When items of jewellery made of base metals like copper, iron or nickel are placed in a solution containing a compound of gold, a film of gold is deposited by:

  1. cooling to $5$ degree centigrade

  2. adding acid

  3. heating

  4. passing an electric current
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electroplating is the process in which a layer of a metal is deposited on metallic or non-metallic electrode by electrolysis in an electrolytic cell.

When items of jewellery made of base metals like copper, iron or nickel are placed in a solution containing a compound of gold, a film of gold is deposited by the process of electroplating which  requires passing an electric current in it.
Hence option D gives the correct answer.

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

Which of the following shows both the properties of both metals and non-metals?

  1. $\displaystyle F$
  2. $\displaystyle Li$
  3. $\displaystyle Fe$
  4. $\displaystyle He$
  5. $\displaystyle Si$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Silicon is a metalloid, a semimetallic element that is neither a metal nor a nonmetal but has some of the properties or characteristics of the two. A semi-metal in the periodic table, silicon is one of the elements that can't be found in nature in its elemental form. It is also one of the most common elements in nature, accounting for about 28 percent of the earth's crust by mass.

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

Monel metal is a metallic alloy of copper and nickel with $5$% iron. It is used in making:

  1. locks

  2. strong boxes

  3. almirahs

  4. motor parts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monel is a group of nickel alloys, primarily composed of nickel (up to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater.

Being stronger than pure nickle Monel metal is used in making locks.
Hence option A is correct answer.

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

Which of the following is not an alloy containing tin metal?

  1. Solder for soldering electrical contacts

  2. Pewter for hardness

  3. Bronze for statues

  4. Brass for articles like bangles and utensils
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Brass for articles like bangles and utensils.

Brass is an alloy of copper and zinc having molecular formula ${Cu} _{3}{Zn} _{2}$

Multiple choice chemistry elements and compounds alloys and their properties metals, alloys and crystals chemical bonding and structure

Which of the following is a steel that is resistant to acids?

  1. Nickel alloy steel

  2. Molybdenum steel

  3. Stainless steel

  4. Cobalt alloy steel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Molybdenum can be obtained from the minerals molybdenite, wulfenite and powellite. It is also obtained as a byproduct during tungsten and copper mining and processing. It has one of the highest melting points of all pure elements; however it is not resistant to acids.Hence, molybdenum steel is also not resistant to acids.

Hence option B is correct answer.

Multiple choice chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

A coordinate covalent bond is represented by an arrow from donor to acceptor.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coordinate covalent bond is represented by an arrow from donor to acceptor.

Eg:NO $[NH _3 \to H]^+$
Coordinate covalent bond means donating a lone pair of electron of one atom to a vacant orbital of another atom.