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CBSE Questions for Class 10 Chemistry Metals And Non Metals Quiz 5 - MCQExams.com
CBSE
Class 10 Chemistry
Metals And Non Metals
Quiz 5
Metals in the middle of the activity series are generally present as _______ in nature.
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carbonates and halides
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oxides and chlorides
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sulphides and carbonates
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all of the above
Explanation
Metals in the middle of the activity series are generally present as sulphides or carbonates in nature. They are moderately reactive. Thus, option $$C$$ is correct.
Metals low in activity series are very:
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reactive
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unreactive
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neutral
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All of the above
Explanation
The reactivity series is a list of metals arranged in the order of their decreasing activities. thus, m
etals low in activity series are very unreactive.
Iodine cannot be transformed into a wire because:
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It is lustrous
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It is brittle
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Both A and B
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None of above
Explanation
Iodine is a non-metal which is brittle, it breaks and shatters easily when hammered. Hence, it cannot be used to make thin wires and is non-ductile.
Which of the following is non-ductile?
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Bromine
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Copper
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Aluminium
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Iron
Explanation
Metals are generally ductile and malleable. Since, bromine is non-metal, it is not ductile. Rest copper, aluminium and iron are metals and hence, are ductile.
Which one of the following is non - ductile?
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Sulphur
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Potassium
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Calcium
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Zinc
Explanation
Sulphur is a non-metal and thus is non - malleable and non - ductile.
Ductility
is the physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking.
Metals reacts with water to form $$\ {W}$$.
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$$W =$$ acidic oxide, carbon dioxide
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$$W =$$ acidic oxide, oxygen
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$$W =$$ metal oxide, hydrogen
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$$W =$$ metal hydroxide, oxygen
Explanation
Metals reacts with water to form a metal hydroxide or metal oxides and hydrogen gas. Option $$C$$ is correct as it covers all possibilties of $$W$$
Match the following.
a) Hardest metal
1) Silver
b) Reddish brown metal
2) Mercury
c) Best conductor of electricity
3) Osmium
d) Liquid metal
4) Copper
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$$a - 4, b - 3, c - 2, d - 1$$
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$$a - 4, b - 2, c - 3, d - 4$$
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$$a - 2, b - 1, c - 4, d - 3$$
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$$a - 3, b - 4, c - 1, d - 2$$
Explanation
Osmium is the hardest metal. It is hard enough to scratch glass.
Silver is the best conductor of electricity.
Copper is the second-best conductor and it is reddish-brown in color.
All metals except mercury are solid at room temperature.
Mercury is the only metal that is present in the liquid state.
Hence, the correct order is a−3, b−4, c−1, d−2.
Between copper and sodium, which metal is more reactive?
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Copper
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Sodium
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Both are equally reactive
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None of the above
Explanation
The reactivity series follows the order:
$$K>Na>Ca>Mg>Al>Zn>Fe>Pb>H>Cu>Hg>Ag>Au$$
Thus, Sodium is more reactive than copper.
Mark the correct statement.
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Some metals are found in earth's crust in the free state
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Metals at the bottom of activity series are least reactive
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Gold, silver can never be found in free state
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Both A and B
Explanation
Some metals are found in the earth's crust in the free state. Some are found in the form of their compounds.
The metals at the bottom of the activity series are least reactive.
Metals like gold and silver are non-reactive and hence are found in a free state only.
Hence, option $$D$$ is correct.
In a solution of lead acetate, a strip of metal Z was dipped. After some time, lead from the solution was deposited at the metal strip. Which is more reactive?
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$$Z$$
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Lead
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Both have equal reactivity
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None of the above
Explanation
$$Z$$ is more reactive. It replaced lead from its compound.
this shows that metal $$Z$$ was more reactive than the lead since it was able to displace lead from its salt solution or the lead acetate solution.
Melting of iron occurs at _____ temperature than sulphur.
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Higher
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Lower
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Equal
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None of the baove
Explanation
The melting point of metals will be higher than non-metal. So iron, which is a metal, will have a higher melting point.
Metal $$A + \ $$ Salt solution of $$B\rightarrow $$ Salt solution of $$A + \ $$ Metal $$B$$
Which one is more reactive among $$A$$ and $$B$$?
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$$A$$
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$$B$$
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Both are equally reactive
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None of the above
Explanation
Metal $$A$$ displaces metal $$B$$ from its solution. Hence, A is more reactive than $$B$$.
Non-metals are never used in cooking utensils because:
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They are good conductors of heat
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They are bad conductors of heat
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They can't cook food properly
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They are not attractive
Explanation
Non-metals are poor conductor of heat. So, they can't be used for cooking utensils.
Which of the following will replace hydrogen from acids to form salts?
$$Cu, Hg, Na, Ag$$
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Copper
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Mercury
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Sodium
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Silver
Explanation
Only those metals which are more reactive than hydrogen, displace hydrogen from acids to form salts and evolve hydrogen gas.
Out of the given elements, only $$Na$$ is a metal which is more reactive than hydrogen as t
he reactivity series follows the order:
$$Na>Pb>H>Cu>Hg>Ag$$
If $$A, B, C, D, E, F, G, H, I, J, K$$ represent metals in the decreasing order of their reactivity, which one of item is most likely to displace all of the metals given?
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A
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C
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J
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K
Explanation
Metal higher in the activity series is said to be more reactive than the others below. Since, A is at the top of the series, it can displace all the metals from their respective salt solution.
Out of sulphur and gold, which will be have a higher melting point?
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Sulphur
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Gold
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Both have equal melting point
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None of the above
Explanation
Metals have a higher melting point than non-metals. So, gold being a metal will have a higher melting point than sulphur.
An element has a dull appearance, low density, and low melting point. It could be a ________.
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metal
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non-metal
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both of the above
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none of the above
Explanation
Non-metals are usually elements that have low density, a dull appearance, and a low melting point.
Conversion of ferric oxide to iron metal using aluminium is called as:
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enrichment process
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hematite reduction
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thermite reaction
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none of above
Explanation
Ferric oxide, when heated with aluminium, it is reduced to iron metal. In this reaction, a lot of heat is produced. This reaction is also known as a thermite reaction. A thermite reaction is used in the welding electric conductors, iron joints, etc. such as joints in railway tracks.
$$ Fe_2O_3 + 2Al \rightarrow 2Fe + Al_2O_3 + \ heat $$
Hence, option $$C$$ is correct.
Cinnabar is heated in air which converts it into:
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mercury sulphide
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mercury
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mercuric acid
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mercuric oxide
Explanation
Cinnabar $$(HgS)$$ is the ore of mercury. Cinnabar $$(HgS)$$ when heated in the air turns $$HgS$$ into $$HgO$$ (mercury oxide or mercuric oxide) accompanied by the liberation of sulphur dioxide.
$$ 2HgS + 3O_2 \rightarrow 2HgO + 2SO_2 $$
Electrolysis is used for oxides of highly reactive metals that are above:
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iron
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aluminium
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antimony
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mercury
Explanation
Metals such as sodium, magnesium, calcium, in the reactivity series are very reactive and cannot be obtained from their compounds by heating with carbon. These metals are obtained by electrolytic reduction. This process is used for oxides of highly reactive metals that are above aluminium in the reactivity series.
Zinc oxide is reduced to zinc metal by heating with:
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carbon
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oxygen
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$$CuSO_4$$
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water
Explanation
Zinc metal is in the middle of the activity series. Such metals are present mostly as sulphides and carbonates. Since it is easier to obtain metals from their oxides, these sulphides and carbonates are first converted to oxides through calcination or roasting. After that, ZnO is reduced to the corresponding metal using suitable reducing agents such as carbon.
Therefore, option A is correct.
$$ ZnO + C \rightarrow Zn + CO $$
Magnesium can be extracted from its ore by:
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reacting with $$CO$$
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reacting with sulphide
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electrolysis
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all of above
Explanation
Magnesium metal is high up in the reactivity series, is very reactive, and cannot be obtained from its compounds by heating with carbon. This is because it has more affinity for oxygen than carbon. Thus, it is obtained by electrolytic reduction.
Which of the following methods is suitable for preventing an iron frying pan from rusting?
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Applying grease
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Applying paint
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Applying a coating of zinc
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All of the above
Explanation
Applying paint and grease are not suitable solutions to prevent an iron frying pan from rusting as the paint can melt by flame and can be destroyed in repeated use.
Applying a coating of zinc is a better option as it forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
The metals sodium, calcium, and magnesium at the top of the reactivity series can be obtained by:
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reduction of their oxides
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oxidation
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electrolysis of their molten chlorides
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heating
Explanation
T
he metals high up in the activity series are very reactive. They cannot be obtained by heating their compounds with carbon. Reduction of their oxides by carbon is not possible because these metals have a high affinity for oxygen than carbon.
Sodium, calcium, and magnesium metals are obtained by the electrolysis of their molten chlorides, e.g., extraction of $$Na$$ from $$NaCl$$.
Option $$C$$ is correct.
Which of the following reactions will occur, according to the activity series?
$$Fe+Al_2O_3 \rightarrow$$
2.
$$Cu+MgCl_2 \rightarrow$$
3.
$$Cu +AlCl_3 \rightarrow$$
4.
$$Fe + HCl \rightarrow$$
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$$1 \ $$and$$ \ 2$$
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Only $$4$$
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Only $$1$$
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$$1, 3 \ $$and$$ \ 4$$
Explanation
The activity/reactivity series is a list of metals arranged in the order of their decreasing activities. Metals higher in the series displace the metals that come below them in the activity series.
$$Fe$$ and $$Cu$$ cannot displace $$Al$$ or $$Mg$$ as they fall below the given metals in the reactivity series. However, since $$Fe$$ is above hydrogen in the series, it can displace $$H$$ from the reaction 4.
$$Fe + 2 HCl \rightarrow FeCl_2 + H_2$$
The following elements are listed in order of decreasing reactivity as they appear in the reactivity series.
$$\displaystyle Na, Ca, Mg, Zn, Fe, H, Cu, Hg, Ag, Au$$
The element that can displace all the elements in the series is :
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$$\displaystyle Na$$
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$$\displaystyle Au$$
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$$\displaystyle H$$
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$$\displaystyle Fe$$
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$$\displaystyle Cu$$
Explanation
$$Sodium$$ lies above in the reactivity series. Therefore, it can displace all the elements from the series.
Which of the properties of metals listed below is not related to their shape or changing their shape?
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Malleability
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Ductility
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Conductivity
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None of these
Explanation
Malleability and ductility are the properties that give an idea about their shape or change the shape of a metal.
Malleability is the property that metals can be beaten into thin sheets.
Ductility is the property of drawing them into thin wires.
Conductivity is the property in which the metal conducts electricity or heat, and is not related to the shape of the metals.
In the reaction between $$Al$$ and $$Fe_2O_3$$, what is the correct final reaction?
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$$Al+Fe_2O_3 \rightarrow Al_3O_2+2Fe$$
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$$2Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$
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$$Al+Fe_2O_3 \rightarrow Al_2O_3+Fe_2$$
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$$Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$
Explanation
Al will displace iron from solution as it is more reactive than iron according to the reactivity series
$$\displaystyle 2Al+Fe_2O_3 \rightarrow Al_2O_3+2Fe$$
The following elements are listed in order of decreasing reactivity as they appear in the reactivity series.
$$\displaystyle Na, Ca, Mg, Zn, Fe, H, Cu, Hg, Ag, Au$$
Of the following, the element that does NOT react with dilute hydrochloric acid to produce hydrogen gas is _______.
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$$\displaystyle Zn$$
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$$\displaystyle Fe$$
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$$\displaystyle Hg$$
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$$\displaystyle Ca$$
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$$\displaystyle Mg$$
Explanation
Hg lies below hydrogen in the reactivity series. Therefore, Hg cannot replace hydrogen from $$HCl$$ and hydrogen gas is not released.
Which of the following is not a property of aluminium?
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Good conductor of heat and electricity
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It is malleable
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It has low melting point
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It is ductile
Explanation
Aluminium is a metal and shows the properties of metals, i.e, malleability, ductility and conductivity of heat and electricity. It has, however, like most metals, has a high melting point.
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