B. Short Answer Questions
1. Name the property of metals, given by the following statements:
(a) Metals have a shining surface.
(b) Metals can be beaten into thin sheets.
(c) Metals can be drawn into thin wires.
2. Out of two elements X and Y, X is malleable and ductile, on the other hand, Y is non-malleable and
non-ductile. Which one
(a) is a metal?
(b) is a non-metal?
(c) forms cations?
(d) forms anion?
3. How would you distinguish between samples of metals and non-metals using a dry cell, a torch bulb
with holder, wires and crocodile clips?
4. Give reasons for the following:
(a) Metals conduct electricity.
(b) Copper does not liberate hydrogen on reacting with dil. H2SO4
5. Give reason: Non-metals in general do not displace hydrogen from dilute acids.
6. A copper plate was dipped into a solution of AgNO3. After some time, a black layer was deposited on
the copper plate. State the reason for it. Write the chemical equation for the reaction involved.
7. Why is sodium chloride soluble in water but not soluble in kerosene?
Answers
Answer:
Answer 1
a) Metal are lustrous
b) Metal are malleable
c) Metal are ductile
Answer 2
a) X is metal
b) Y is non metal
c) ?????
please mark as brain list answer
Answer:
please block me .......
......1...Name one metal and one non-metal which exist in liquid state at room temperature.
ANSWER:
Mercury is the metal that exists in liquid state at room temperature. The non-metal that exists in liquid state at room temperature is bromine.
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Question 2:
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
ANSWER:
Metals can form positive ions easily by losing electrons. So, they are called electropositive elements. Non-metals can form negative ions easily by gaining electrons and so, they are called electronegative elements.
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Question 3:
(a) Name the most abundant metal in the earth's crust.
(b) Name the most abundant non-metal in the earth's crust.
ANSWER:
(a) Aluminium is the most abundant metal in the earth's crust.
(b) Silicon is the most abundant non-metal in the earth's crust.
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Question 4:
Name one metal which has a low melting point.
ANSWER:
Sodium is a metal that has a low melting point.
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Question 5:
Name the metal which is the poorest conductor of heat.
ANSWER:
Lead is the metal that is the poorest conductor of heat.
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Question 6:
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a 'pop' sound.
ANSWER:
False. Metals react with dilute acids to produce hydrogen gas that burns with a 'pop' sound.
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Question 7:
From amongst the metals sodium, calcium, aluminium, copper, and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
ANSWER:
(i) Magnesium reacts with water only on boiling.
(ii) Copper does not react even with steam.