Tag: chemistry

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Questions Related to chemistry

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

Tin is used for making fusible alloys.

  1. True

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

A fusible alloy is a metal alloy capable of being easily fused, i.e. easily meltable, at relatively low temperatures. The most widely used fusible alloys contain high percentages of bismuth, combined with lead, tin, cadmium, indium and other metals. Bismuth has an impact on the melting point, as well as the growth and shrinkage characteristics of the alloys.

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

The main component of bronze is:

  1. cobalt

  2. copper

  3. tin

  4. aluminium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.

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

$SiO _2$ (Silica) occurs in the form of:

  1. sand

  2. quartz

  3. opal

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Silica also known as silicon dioxide. It is found in nature as quartz, sand or opal. Silica more so than almost any material exists in many crystalline forms called polymorphs. Silica in the form of sand is used as ingredient in sand casting.

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

_________ cannot be readily separated by physical means.

  1. Mixtures

  2. Metals

  3. Alloys

  4. Non-metals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alloys are metallic materials consisting of two or more elements combined in such a way that they cannot be readily separated by physical means. More than 90% of metals used are in the form of alloys.

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

The alloy bronze contains copper and tin. This is a:

  1. homogeneous mixture

  2. heterogeneous mixture

  3. solid solution of two immiscible metals

  4. pure substance
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon.

All the alloys are homogeneous mixture.

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

Type metal is a well-known alloy made out of the three metals:

  1. $Pb,\ Sb, \ Sn$
  2. $Ni,\ Cu,\ Ag$
  3. $Ag,\ Ni,\ Zn$
  4. $Al, \ Cu, \ Zn$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Type metal is an alloy of lead, tin and antimony in different proportions depending on the application, be it individual character mechanical casting for hand setting, mechanical line casting or individual character mechanical typesetting and stereo plate casting.

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

Metallic bonding describes an array of positively charged metal cations surrounded by a sea of electrons that makes up a class of substances known as which of the following?

  1. Alloys

  2. Allotropes

  3. Isomers

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

Answ: (A) Alloys

- We know that alloys is mixture of two or more metals. Which is held by metallic bond.
eg : brass which is made from copper and zinc.

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

An alloy is a specific type of substance that can best be described by which of the following?

  1. An alloy is a mixture of various metals that can also contain non-metal elements.

  2. An alloy is a compound made of different types of metals.

  3. An alloy can only contain metals from the transition elements.

  4. An alloy can only contain two pure metals mixed in even quantities.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ans : (A) An alloy is a mixture of various metals that can also contain non-metals elements.

Eg : Steel is an alloy of iron (metal) and carbon (non-metal).

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

Statement 1: A mixture of pure metals is called an alloy. The melting point of an alloy will be lower than either of the component metals
Statement 2: The new bonds are weaker.

  1. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

  2. Both the Statement 1 and Statement 2 are correct, but Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct, but Statement 2 is not correct.

  4. Statement 1 is not correct, but Statement 2 is correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both statement right and statement $2$ are correct Explanation.

Note : [alloy is the mixture of different metals .each metal having different size and structural arrangements. The different sizes of atoms in an alloy make their arrangement less regular than a pure metal. This makes the bonds between the atoms weaker and lower melting point.