Tag: chemistry

Questions Related to chemistry

Sulphur is used in:

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. welding

  2. electroplating

  3. vulcanising rubber

  4. the manufacture of paints

Show answer
Correct Option: C
Explanation:
Vulcanization is addition of sulphur in natural rubber by chemical process to improve its durability. 

Which of the following mixtures is used in the preparation of tips of match sticks?

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. $S +K$

  2. $Sb _2S _3+S$

  3. $K _2Cr _2O _7+S+P$

  4. $P+K$

Show answer
Correct Option: B
Explanation:

The heads of safety matches contain antimony trisulfide $Sb _2S _3$, potassium chlorate, sulfur, powdered glass, inert fillers, and animal glue.

Hence option $B$ is correct.

Which element is an important component of transistors?

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. sodium

  2. copper

  3. germanium

  4. radium

Show answer
Correct Option: C
Explanation:

Germanium metal is used as semiconductor in transistors and various others electronic devices. These days its production for use in semiconductor electronics is a very small fraction, only 2%.

The metal used for making radiation shield is:

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. $Al$

  2. $Fe$

  3. $Zn$

  4. $Pb$

Show answer
Correct Option: D
Explanation:

Shielding reduces the intensity of radiation depending on thickness. A quantity known as the halving-thicknesses is used to calculate. The half value layer of lead is 1.0 cm.

The tip of the lead pencil is made of:

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. lead

  2. graphite

  3. zinc

  4. charcoal

Show answer
Correct Option: B
Explanation:

The tip of the lead pencil is made up of graphite.


Graphite can leave the grey mark on the paper. It was originally thought to be a part of lead. In spite of the name, the lead pencil does not contain lead.


Graphite is an allotrope of carbon, which is a good conductor of electricity and is resistant to many chemicals.

Graphite pencils are made of a mixture of clay and graphite.


Hence, te correct option is $\text{B}$

A non-metal which helps in the growth of plants is:

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. sulphur

  2. hydrogen

  3. helium

  4. nitrogen

Show answer
Correct Option: D
Explanation:

Two major non-metals that enhance the growth of plants as constituents of fertilizers are nitrogen and phosphorus. Nitrogen helps in the leaf development and the green color of leaves is due to it. Phosphorus helps in the development of seeds and fruits and also as disease resistant.

Magnesium is used in fireworks.

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
The reason of magical Colors of Fireworks
  • Red. strontium salts, lithium salts.
  • Orange. calcium salts.
  • Gold. incandescence of iron (with carbon), charcoal, or lampblack.
  • Yellow. sodium compounds.
  • White. white-hot metal, such as magnesium or aluminum.
  • Green. barium compounds + chlorine producer.
  • Blue. copper compounds + chlorine producer.

Pencil lead does not contain lead.

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

There is no lead(element) in pencils. Rather, the core is made up of a non-toxic mineral called graphite. The common name 'pencil lead' is due to a historic association with the stylus made of lead in ancient Roman times.

Mercury is used as a thermometric liquid.

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

It is true. Mercury is metal but at room temperature it exit in liquid state so it is use as a thermometric liquid. 

Which of the following non-metal is commonly used as pesticides and photography?

chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

  1. Bromine

  2. Helium

  3. Selenium

  4. Iodine

Show answer
Correct Option: A
Explanation:

Bromine compounds are effective pesticides, used to prevent pests from attacking stored grain and other produce. Bromine compounds are also used  in photography. Several compounds are used to make the light-sensitive component of a photographic emulsion; without bromine compounds photographs would not capture sufficient light.