Tag: composition of matter

Quizzes (15) Questions (47)

Questions Related to composition of matter

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

The non-metal which is liquid at room temperature is:

  1. chlorine

  2. fluorine

  3. bromine

  4. iodine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bromine is the only non-metal which is liquid and diatomic molecule at room temperature. 

It is a dense, reddish-brown liquid evaporating at standard temperature and pressure to give an orange vapour. It is one of the only two elements on the periodic table that are liquids at room temperature other than mercury.

Hence, option $C$ is correct.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Which of the following is not a property of non-metals?

  1. Non-metals can be stretched into thin wires

  2. Non-metals are not ductile

  3. Non-metals are not malleable

  4. Non-metals break easily
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Non-metals are non-malleable and non-ductile. They are brittle. They break easily. So, they are regarded as brittle. They can't be stretched into mines or hammered into sheets.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Brittleness is a characteristic property of:

  1. gaseous non-metals

  2. liquid non-metals

  3. solid non-metals

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Brittleness is a characteristic property of non-metals. And here, we consider solid non-metals only. It is not applicable to liquid or gaseous non-metals.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Non-metals have properties similar to that of metals.

  1. True

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

Non-metals have properties similar to that of metals , This  Statement is false because:

Properties of metals : 

Metals are solid at room temp. 
They are generally hard and strong. 
They have metallic lustre. 
They have high melting and boiling points. 
They are good conductors of heat and eletricity. 
Metals are sonorous. 
Most metals have high tensile strength. 
They are malleable. 
They are ductile. 
They have high densities. 


Properties for non-metals: 

Non-metals are glasses or solids at room temp. except bromine. 
They are not as hard as metals and have low tensile strengths. 
They do not have lusture. 
They are bad conductors of heat and electricity. 
Non-metals are brittle, they are neither malleable nor ductile. 
They usually have low densities. 
They have low melting and boiling points. 
They are non-sonorous. 

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Plastic sulfur has no sharp melting point.

  1. True

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

Amorphous or plastic sulfur is produced by rapid cooling of molten sulfur e.g. by pouring it in cold water. It has helical form and metastable at room temperature reverting to its crystal allotrope and have sharp melting point.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

State whether true or false :

Diamond and iodine are non-metals which are lustrous.

  1. True

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

In case of iodine, the large size of the atom results in low shielding of valence electrons. 


Upon absorption of light or heat by these electrons, the de-excitation of the absorbed heat from the surrounding emit light so it appears that they have lustrous surface.


The sparkling shine of the diamond comes from its cut, clarity, refractive index and reflection. 

The natural diamonds found from the earth is dull and dim. Total internal reflection partially provides the brilliance and shine to the diamond. 

When light strikes the diamond, it gets refracted and get separated into individuals colors. Diamonds normally have high refractive index thus providing a brilliant shine to the diamond.

Therefore Diamond , graphite & iodine are nonmetals which are lustrous because of their crystal structure.

Therefore, option A is correct.

Multiple choice chemistry composition of matter physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Compare the physical properties of metals and non-metals in general with reference to melting point.

  1. Both have low melting point

  2. Both have high melting point

  3. Metals have low melting point while non-metals have high melting point

  4. Metals have high melting point and non-metals have low melting point
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metals have high melting and boiling point. Tungsten has the highest melting point where as silver has low boiling point. Sodium and potassium have low melting points. Non metals have low melting point.