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CBSE Questions for Class 10 Chemistry Metals And Non Metals Quiz 7 - MCQExams.com
CBSE
Class 10 Chemistry
Metals And Non Metals
Quiz 7
Rods of carbon and copper are hammered simultaneously. Which property of carbon is responsible for carbon rod breaking down into pieces?
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0%
Ductility
0%
Malleability
0%
Lustre
0%
Brittle
Explanation
Non-metals are brittle and they break when hammered. Carbon, which is a non-metal, thus breaks when hammered.
Non-metals exist in which state?
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Solid
0%
Liquid
0%
Gas
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All of the above
Explanation
Non-metals are generally solids and gases. But bromine is a liquid non-metal.
Hence, option D is correct as we find different non-metals existing in all three states.
Metals are solid at room temperature except:
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Mercury
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Gallium
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Both A and B
0%
Sodium
Explanation
Metals are solid at room temperature except for Mercury and Gallium. These are liquids at room temperature.
Hence option C is correct.
Which of the following statements are incorrect?
Statement 1: Non-metals possess the property of ductility and malleability
Statement 2: Non-metallic elements are brittle
Statement 3: Metals can produce ringing sound by striking
Statement 4: Melting points and boiling points of metals are low
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0%
1 and 3
0%
2 and 3
0%
1 and 4
0%
2 and 4
Explanation
Non-metals do not possess the property of malleability and ductility.
Non-metals are brittle.
Metals can produce ringing sounds and this property is called sonority.
Metals have high melting and boiling points.
Statements 2 and 3 are correct. Statements 1 and 4 are incorrect.
Option C is correct.
The major products of the following reaction is:
$$ZnS(s)+{ O }_{ 2 }(g)\xrightarrow [ ]{ heat } $$
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$$ZnO$$ and $${SO}_{2}$$
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$$Zn{SO}_{4}$$ and $${SO}_{3}$$
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$$Zn{SO}_{4}$$ and $${SO}_{2}$$
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$$Zn$$ and $${SO}_{2}$$
Explanation
$$2ZnS(s) + 3O_2 (g) -> 2ZnO(s) + 2SO_2 (g)$$
This method is called roasting. Therefore the correct products are of option $$A$$.
Red hot carbon will remove oxygen from the oxides $$XO$$ and $$YO$$ but not from $$ZO. Y$$ will remove oxygen from $$XO$$. Use this evidence to deduce the order of activity of the three metals $$X, Y$$ and $$Z$$ putting the most active first.
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0%
$$XYZ$$
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$$ZYX$$
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$$YXZ$$
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$$ZXY$$
Explanation
Since carbon can't remove oxygen from $$ZO, Z $$ is the most active metal.
In $$X$$ and $$Y$$, $$Y$$ can replace $$X$$, so $$Y$$ is more reactive and $$X$$ is the least reactive.
Hence, order of activity $$ZYX$$.
Nonmetals are sonorous.
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0%
True
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False
Explanation
Nonmetals are non-sonorous. Metals are generally sonorous.
The sonorous substance makes a tingling sound when we hit them.
Example: Electric bells are made up of metals thus they make a tingling sound
Which of the following is not essential for rust to form?
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Water
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Iron
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Oxygen
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Carbon dioxide
Explanation
The presence of water and oxygen is essential for the rusting of iron. Iron does not rust in presence of carbon dioxide.
Thus, the correct option is $$D$$.
Iodine is a :
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Lustrous non-metal
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Sonorous non-metal
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Lustrous metal
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Malleable metal
Explanation
Generally, Non-metals are not lustrous(not shiny). But Iodine and graphite are the only non-metals that exhibit lustre. Hence, option A is correct.
When sodium is dropped in small amount of water it catches fire. Which one of the following gas release in this process?
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$$Na$$
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$$H_2O$$
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$$H_2$$
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$$NaOH$$
Explanation
hydrogen gas is released when Na metal is dropped in small amount of water. The reaction is: $$ 2Na+\quad 2{ H }_{ 2 }O\quad \rightarrow \quad 2NaOH\quad +\quad { H }_{ 2 } $$
Bronze statues and articles of copper slowly tarnish in air and turn green. This green colour is due to the formation of:
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basic copper sulphate
0%
an oxalate
0%
copper sulphate
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copper oxide
Explanation
Copper becomes green
after some time
due
to its exposure to
air
.
Copper
reacts with carbon-dioxide and moisture present in
air
first
forming
cupric hydroxide and then basic
copper
carbonate. This compound is
green
in
colour
.
Hence option A is correct answer.
Which of the following is a characteristic property of non-metals?
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Not malleable
0%
Ductile
0%
Malleable
0%
Sonorous
Explanation
Non-metals are generally not malleable as they can not be beaten into thin sheets. The substance which can be beaten into thin sheets is called malleable. Hence, option $$A$$ is correct.
Which of the following is true in case of electrolytic refining?
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Impure metal is made cathode.
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Impure metal is made anode.
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Impure metal is made cathode and pure metal as anode.
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Both electrodes must be of pure metal.
Explanation
In electrolytic refining,
impure metal is made the anode and a thin strip of pure metal is used as cathode.
Which of the following are not the characteristic property of non-metal?
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Sonorous
0%
Not malleable
0%
Not ductile
0%
Not lustrous
Explanation
Non-metals are not sonorous as they do not produce sound when they are beaten.
Hence, option A is correct.
Zn gives $$H_2$$ gas with $$H_2SO_4$$ and HCl but not with $$HNO_3$$ because
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Zn acts as an oxidizing agent when reacts with $$HNO_3$$
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$$HNO_3$$ is weaker acid than $$H_2SO_4$$ and HCl
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In electrochemical series, Zn is above hydrogen
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$$NO^{-1}_3$$ ion is reduced in preference to hydronium ion.
A metal 'M' has shining appearance and reacts with hot water and also with dilute hydrochloric acid to evolve hydrogen gas. The metal 'M' is:
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can be copper because it lies above hydrogen in the reactivity series, i.e., more reactive than hydrogen
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can be gold because it lies below hydrogen in the reactivity series, i.e., more reactive than hydrogen
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cannot be gold because it lies above hydrogen in the reactivity series, i.e., less reactivity than hydrogen
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cannot be copper because it lies below hydrogen in the reactivity series, i.e., less reactive than hydrogen
Explanation
The reactivity series is a list of metals arranged in the order of their decreasing activities. The reactivity series follows the order:
$$K>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Hg>Ag>Au$$
Thus, 'M' can't be copper as it lies below hydrogen in the reactivity series.
The properties of four elements are shown. Which element is used to make aircraft bodies?
Element 1 - Density - high, brittle or malleable - brittle
Element 2 - Density - high, brittle or malleable - malleable
Element 3 - Density - low, brittle or malleable - brittle
Element 4 - Density - low, brittle or malleable - malleable
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Element 1
0%
Element 2
0%
Element 3
0%
Element 4
Explanation
Solution:- (D) Density - low, brittle or malleable - malleable
The metals used to make aircraft bodies have low density and are malleable such as aluminum, steel, etc.
Thus Element 4 will be the right answer
In metal reactivity series, the more reactive metals are placed at the:
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0%
top
0%
bottom
0%
middle
0%
none
Explanation
In a reactivity series, the more reactive metals are
placed at the top of the series followed by less reactive. The more reactive a metal is, the more will be its tendency to lose electrons.
The metal with does not react with hydrochloric acid is/are:
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0%
Potassium
0%
Zinc
0%
Aluminium
0%
Copper
Explanation
Metals react with acids to give metal salt and hydrogen gas. But this is not true for all metals. Only those metals which are more reactive than hydrogen will liberate hydrogen from the acid and forms corresponding metal salt. These metals are placed above hydrogen in the metal activity series.
As copper is less reactive than hydrogen, therefore, it will not liberate hydrogen gas when reacted with dilute HCl.
Which two properties are physical properties of all pure metals?
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Property $$1$$ - brittle, property $$2$$ - poor conductor of heat
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Property $$1$$ - good conductor of electricity, property $$2$$ - malleable
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Property $$1$$ - good conductor of heat, property $$2$$ - low melting point
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Property $$1$$ - malleable, property $$2$$ - low density
Explanation
Solution:- (B) Property - good conductor of electricity, property - malleable
Metals are good conductors of electricity and are malleable as well as ductile in nature.
Which statement is correct generally for all metals?
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They conduct electricity
0%
They are brittle
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They are non-sonorous
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They have a low melting point
Explanation
Non-metals are usually brittle, non-sonorous, and have low melting points. Metals have the property to conduct both electricity as well as heat.
Hence, option A is correct.
The position of some metals in the electrochemical series in decreasing electropositive character is given as: $$Mg > Al > Zn > Cu > Ag$$. What will happen if a copper spoon is used to stir a solution of aluminium nitrate?
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The spoon will get coated with aluminium.
0%
An alloy of copper and aluminium is formed.
0%
The solution becomes blue.
0%
No chemical change will take place.
Explanation
According to the
given electrochemical series
,
Al
is having more
electropositive character
than that of
Cu
, that means
Al
is more reactive than that of
Cu
and easily replace
Cu
from its
solution
, so,
when a copper spoon is used to stir
aluminum
nitrate solution
then no reaction occurs.
The important metal used with iron to produce stainless steel is:
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0%
Carbon
0%
Tin
0%
Chromium
0%
Aluminium
Explanation
Stainless steel contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure.
Which substances are needed for iron to rust?
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Carbon dioxide and oxygen
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Oxygen only
0%
Water and carbon dioxide
0%
Water and oxygen
Explanation
Iron and steel rust when they come into contact with water and oxygen or moisture.
So, option $$D$$ is correct.
Metals such as lead, copper, silver and gold do not react with water at all.
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Statement is False
0%
Statement is True
0%
Lead reacts but copper, silver, and gold do not
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Copper reacts but lead, silver and gold do not.
Explanation
Metals such as lead, copper, silver and gold do not react with water because these metals are inert towards cold and hot water.
At $$30^o$$C, which $$3$$ metals are all liquids?
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Hg, Fe, Zn
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Hg, Sn, Pb
0%
Zn, Pb, Sn
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Hg, Ga, Cs
Write true or false for the following statements:
Metals are malleable, ductile, sonorous and lustrous.
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0%
True
0%
False
Explanation
Metals can be bet to form thin sheets (malleable),
drawn to form thin wires (ductile).
They produce a ringing sound when they are hit (sonorous) and have a shiny appearance (lustre). Thus, the above statement is true.
Generally metals reacts with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except $$Mn$$ and $$Mg$$)?
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$$H_2SO_4$$
0%
$$HCl$$
0%
$$HNO_3$$
0%
All of these
Explanation
Hint: Nitric acid is a strong oxidizing agent that can oxidise hydrogen gas.
Step 1:
Generally metals reacts with acids to give salt and hydrogen gas. For example:
$$K(s)+H_2SO_4(aq)\to K_2SO_4(aq)+H_2(g)$$.
$$2K(s)+2HCl(aq)\to 2KCl(aq)+H_2(g)$$
Step 2:
The end product of the reaction nitric acid with metals depends on the reactivity of the metal since nitric acid is a strong oxidizing agent that can oxidise hydrogen gas produced to water along with the production of oxides of nitrogen.
For example:
$$Mg(s)+2HNO_3(aq)\to Mg(NO_3)_2(aq)+H_2(g)$$
$$8K(s)+10HNO_3(aq)\to 8KNO_3(aq)+N_2O(g)+5H_2O(l)$$
Step 3:
In the second reaction of metal with nitric acid, no hydrogen gas is produced because the hydrogen gas produced by displacement is oxidised to water.
Final step:
So, the correct option is
(C) $$HNO_3$$.
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxides solution is
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0%
copper
0%
aluminium
0%
iron
0%
sodium
Explanation
Aluminium being amphoteric in nature reacts with both acids and bases.
Hence, option "B" is correct answer.
The table below gives information about four substance A, B, C, and D.
Substance
Melting point
Electrical conductivity (liquid)
Solubility
A
High
Poor
Soluble in water
B
High
Good
Soluble in water
C
Low
Poor
Soluble in kerosene
D
High
Good
Soluble in kerosene
Identify the ionic substance from the above given substances.
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A
0%
B
0%
C
0%
D
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