CHAPTER-3 METALS AND NON METALS
MULTIPLE CHOICE QUESTIONS
1. 1. Which of the following is not a property of metals?
(a) Conduction
(b) Sonorous
(c) Dullness
(d) Ductility
2.
Metals are refined by using
different methods .Which of the
following metal is refined by electrolytic refining?
(i) Au (ii) Cu (iii) Na
(iv) K
(a) (i) and (ii)
(b) (i) and (iii)G
(c) (ii) and (iii)
(d) (iii) and (iv)
3.
Which of the following contains mercury as one of
its constituents?
(a) Stainless Steel
(b) Alnico
(c) Solder
(d) Zinc amalgam
FILL
IN THE BLANKS
4.
Aqua regia consists of parts
of conc. HCl and parts of
conc HNO3.
5.
is a liquid non-metal.
6.
is an amphoteric oxide.
ONE
MARK QUESTIONS
7.
Name one metal which is a good conductor
of electricity and one which is a poor conductor of electricity.
8.
Why are food cans coated with
tin and not with zinc?
9.
Give the role of anhydrous calcium chloride in the
process of roasting.
ASSERTIONS
AND REASONS
For the question
numbers 10, 11 and 12, two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to
these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both A and R are
true and R is the correct explanation of A.
( b) Both A and R are
true but R is not the correct explanation of
A
c) A is true but R
is false.(
d) A is false but R
is true
10 . assertion: Iron is found in the free state in nature.
Reason: Iron is a highly reactive element.
11. Assertion: The thermite welding process is based on reducing the property of iron.
Reason: The reduction of metal oxide to form metal by using aluminium
powder is called thermite reaction.
12. Assertion: Magnesium chloride is covalent.
Reason: Metals and
non-metals react by mutual transfer of electrons.
THREE
MARK QUESTIONS1
3. (a) A zinc rod was dipped in
the CuSO4 solution.
After a certain time, copper from the solution was deposited
on the zinc rod. State the reason why did it happen. Give the chemical equation
of the reaction involved.(b)Why should the metal sulphides and carbonates be
converted to metal oxides in the process of extraction of metal from them?An
ore on heating in air produces sulphur dioxide.
(a) Which process
would you suggest for its concentration?
(b) Describe briefly any two steps involved
in the conversion of concentrated ore into related metal.
15. Give a reason for the following:
(a) Ionic compounds have a high melting point and boiling point.
(b) Ionic compounds conduct electricity in a molten state.
(c) Ionic compounds are solids at room temperature and are somewhat hard.
16.
What happens when
(i) ZnCO3 is heated in the absence of oxygen?
(ii) A mixture of Cu2O and Cu2S is heated?
(iii)
A copper coin is
kept immersed in a solution of
silver nitrate for some time.
FIVE
MARK QUESTIONS
17.
(a) In the formation of
compounds between two atoms A and B, A
loses two electrons and B gains one electron.
(i) What is the nature of the bond formed between A and B?
(ii) Suggest the
formula of the compound formed between
A and B.
(b) Explain the formation of the MgCl2 molecule.
(c) Write the
electron dot structure of oxygen.
18.
(a)What is meant by the refining of metals?
(b)Generally, no hydrogen gas
is evolved when metals react with
dilute nitric acid. Why? (c)Write the chemical name of the coating
that is formed on silver and copper articles.
(d)How do the properties of iron change when:
(i)
A small quantity of carbon is mixed
with it?
(ii)Nickel and chromium
are mixed with it?
19. (a)You are
provided with three metals Sodium, Magnesium, and copper. Using only water as the reactant how will
you identify them?
(b)Hydrogen is not a metal but it has been assigned
a place in the reactivity series of metals. Explain.
20. CASE STUDY
Answer
question numbers 20 (a) to 20 (d) based on your understanding of the following
paragraph and the related studied concepts.
A customer approached a newly trained Goldsmith and asked him to make
ornaments. For this, he gave advance
money. The Goldsmith bought a bar of 24-carat gold and tried to make ornaments
from it. He was not as successful as the gold was too soft to handle. He approached a trained goldsmith who advised him to use 22-carat gold for this purpose and this time he was successful and could
make the ornaments.
(a) What is the difference between 24-carat gold and 22-carat gold?
(b)Does gold corrode in saltwater?
(c) Name the chemical which can dissolve gold.
(d) Why is 22-carat
gold used in making ornaments?
