Tag: chemistry

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

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

  1. $S +K$
  2. $Sb _2S _3+S$
  3. $K _2Cr _2O _7+S+P$
  4. $P+K$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

The tip of the lead pencil is made of:

  1. lead

  2. graphite

  3. zinc

  4. charcoal
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $\text{B}$

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

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

  1. sulphur

  2. hydrogen

  3. helium

  4. nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Magnesium is used in fireworks.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

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

  1. Bromine

  2. Helium

  3. Selenium

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