Tag: composition of matter

Questions Related to composition of matter

Tap water is:

  1. compound

  2. a mixture

  3. an element

  4. none of these


Correct Option: B
Explanation:

Tap water is not the pure form of water, it contains a large number of salts, elements, bacteria and other impurities,

so, tap water is considered as a mixture.

On the basis of composition of matter, milk is considered to be:

  1. a pure substance

  2. an impure substance

  3. an element

  4. a compound


Correct Option: B
Explanation:

An impure substance is a substance that contains two or more elements or compounds that are not bonded chemically . So Milk is an impure substance .

Which pair of the following substances is said to be isomorphous?

  1. White vitriol and blue vitriol

  2. Epsom salt and Glauber salt

  3. Blue vitriol and Glauber salt

  4. White vitriol and epsom salt


Correct Option: A
Explanation:

White vitriol and blue vitriol are known as isomorphous because they have similar chemical formula and closely similar in shape.

All non-metals are solids or gases, except bromine which is liquid non-metal at room temperature.

  1. True

  2. False


Correct Option: A

Compare metals and non-metals with particular emphasis on solubility:

  1. Both dissolve in solvent

  2. None of them dissolve in solvent

  3. Metal dissolve while non-metal do not dissolve in solvent

  4. Non-metal dissolve while metal do not dissolve in solvent


Correct Option: D
Explanation:
MetalsThey do not dissolve in solvents except by chemical action. Non-metalsThey dissolve in solvents and can be re-obtained by evaporation. Example: sulphur in carbon disulphide.

The non-metallic mineral among the following is :

  1. graphite

  2. chromite

  3. bauxite

  4. tungsten


Correct Option: A
Explanation:

Chromite is an ore of chromium, bauxite is an ore of aluminium and tungston are metallic in nature while graphite is an allotrope of carbon and a carbonaceous compound. It is a very soft allotrope of carbon while other allotrope of carbon diamond is the hardest known element on this earth. This is because of the chemical structure of graphite which shows slippery nature of layers of carbon and presence of loose electrons.

Which of the following is suitable to make raincoats?

  1. Cotton

  2. Plastic

  3. Silk

  4. Wool


Correct Option: B
Explanation:

Plastic is waterproof, it cannot absorb water while the others can.

A mirror is:

  1. opaque

  2. transparent

  3. translucent

  4. none of these


Correct Option: A
Explanation:

A silver glass mirror is an ordinary mirror, coated on its back surface with silver, which produces images by reflection. This kind of glass mirror is produced by coating a silver, copper film and two or more layers of waterproof paint on the back surface of float glass, which perfectly resists acid and moisture.

As it reflect all the light falling on it and we can see through it so it is a opaque.

Which of the following is not a correct statement?

  1. Non-metals melt at low temperature

  2. Non-metals are generally bad conductors of heat and electricity

  3. Non-metals are non-sonorous

  4. Non-metals are malleable


Correct Option: D
Explanation:

Non-metals are malleable, is an incorrect statement.

Which among the following is a non-metal?

  1. Bromine

  2. Zinc

  3. Sodium

  4. Iron


Correct Option: A
Explanation:

Bromine is a liquid non-metal. Rest others are metals.