CLASS X METALS & NONMETALS

Q & A
Q1: List any five physical properties of metals.
Answer: Physical properties of metals are:
1. Metals are usually hard (exceptions are:
sodium and potassium).
2. These are sonorous.
3. These are lustrous.
4. Metals exhibit malleability and ductility.
5. Mostly they are solids (exception is mercury)
6. They exhibit high tensile strength.
7. These have high densities.

Q2: Are metals electronegative or
electropositive?
Answer: Metals are electropositive i,e. they form
cations by loosing electrons.

Q3: Define Malleability.
Answer: Malleability is the property of a metal, by which
it can be beaten into thin sheets.

Q4: Name a metal which can be cut with a knife?
Answer: Sodium

Q5: Give examples of metals which are found in
liquid form at room temperature.
Answer: Mercury and Gallium

Q6: Define ductility. Give two examples of metals
that exhibit this property.
Answer: Ductility is the property of a metal by which it
can be drawn into thin wires. e.g. gold and silver.

Q7: Give an example of metal which is
i. the best conductor of heat
ii. the poor conductor of heat
Answer: (i) Silver  (ii) lead

Q8: What are metalloids? Give examples of
metalloids.
Answer: The elements that exhibit properties of both
metals and non – metals are called metalloids.
e.g. bismuth, silicon, germanium, arsenic, antimony,
tellurium and polonium

Q10: What are minerals?
Answer: The Inorganic elements or compounds of
various metals found in nature, associated with their
earthly impurities are called Minerals.

Q11: Can metals be extracted from all types of
minerals?
Answer: No. Some minerals may have high percentage
of metals while other do not.

Q12: What are ores?
Answer: Those minerals from which metals can be
extracted profitably and conveniently are called Ores.

Q13: Define metallurgy.
Answer: The process of extracting metals from their
ores followed by refining is known as metallurgy.

Q14: Give an example of non-metal which is
lustrous.
Answer: Iodine

Q15: Give an example of a non-metal which is hard
and has high melting point.
Answer: Diamond (allotrope of Carbon)

Q16: What is gangue and what is concentration?
Answer: Ores are usually associated with unwanted
earthly matter called gangue (sand, clay etc.,) and the
removal of this unwanted impurity is called
concentration. The gangue has to be removed before
the extraction of metals.

Q17:  Why do potato chips manufacturers fill the
packet of chips with nitrogen gas?
Answer: Nitrogen provides an inert atmosphere to
prevent chips from getting oxidised. Nitrogen is an
antioxidant which prevents oxidation of substances and
that's why such type of food material is flushed with
nitrogen in packs.

Q18: Name any non-metal which is found in liquid
state at room temperature.
Answer: Bromine

Q19 ): You are given two statements a and b,
select the correct inference from this:
a. Metals conduct heat.
b. Diamond is the best conductor of heat.
i. Hence diamond is a metal
ii. Statement a is correct
iii. Statements a and b is correct
iv. None of the above
Answer: ii. Statement a is correct