MCQ Questions for Class 10 Chemistry Metals And Non Metals Quiz 3

The reactivity of iron, magnesium, sodium and zinc towards water are in order as:

0%
$Fe > Mg > Na > Zn$
0%
$Zn > Na > Mg > Fe$
0%
$Na> Mg > Zn > Fe$
0%
$Mg > Na > Fe > Zn$

Explanation

Reactivity series is a list of metals arranged in decreasing order of their reactivity or activity based on displacement reactions conducted experimentally. It follows the order:

$Na>Ca>Mg>Al>Zn>Fe$

Thus, option

$C$ is correct.

The correct order of increasing chemical reactivity is :

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$Zn < Fe < Mg < K$
0%
$Fe < Mg < Zn < K$
0%
$Fe< Mg < K < Zn$
0%
$Fe < Zn < Mg < K$

Explanation

The reactivity series is a series in which metals are arranged in decreasing order of their reactivities.

$Fe<Zn<Mg<K$
In the reactivity series, the most active metal is at the top of the series.

Which of the following elements produce basic oxides upon reacting with oxygen?

0%
Chorium
0%
Sulphur
0%
Sodium
0%
Magnesium

Explanation

Metals react with oxygen to produce basic oxides.

Sodium and magnesium metal react with the oxygen of the air at room temperature to form sodium oxide and magnesium oxide respectively. These oxides react with water to form hydroxides.

$4Na + O_2 \rightarrow 2Na_2O$

$Na_2O + H_2O \rightarrow 2NaOH$

$2Mg + O_2 \rightarrow 2MgO$

$MgO + H_2O \rightarrow Mg(OH)_2$

Copper sulphate solution can be safely kept in a vessel made of :

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gold
0%
lead
0%
silver
0%
zinc

Explanation

The reactivity series follows the order:

$Zn>Fe>Pb>H>Cu>Hg>Ag>Au$

Thus, silver and gold are less reactive than copper. Hence, they can't displace copper from its solution and can be used to make a vessel to store copper.

Ionic compounds are more likely to be soluble in:

0%
water
0%
kerosene
0%
oil
0%
petrol

Explanation

We know that "like dissolves like". Ionic compounds being polar are more likely to be soluble in a polar solvent such as water.

Kerosene, oil, and petrol are non-polar solvents and, hence, are not likely to dissolve ionic compounds in them.

Thus option

$A$ is correct.

Metals are usually hard and difficult to cut.
On the other hand, non-metals are usually brittle. When hit with a hammer, they break into small pieces.

Identify the element that is relatively more brittle from the options below:

0%
Sulphur
0%
Diamond
0%
Iron
0%
Magnesium

Explanation

Diamond and Sulphur are the non-metals from the options given. However, diamond is an exception - it is one of the hardest substance on Earth and can't be broken easily.

Therefore, option

$A$ is correct.

Which of the following statement(s) is/are true?

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All ores are minerals.
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Only non-metals are abundant on earth
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Copper and silver are found in the combined state as their sulphide or oxide ores
0%
Oxygen is a very reactive element

Explanation

Minerals that have very high percentage of a particular metal and from which the metal can be profitably extracted are called ores. So, all ores are minerals.

Both non-metals and metals are found abundantly on Earth. Metals like copper and silver are found in both free states as well as in combined states. The ores of many metals are in oxides form and that is because oxygen is a very reactive element.

Therefore, options

$A, C$ and

$D$ are correct.

To protect iron from corrosion and rust, it is coated by :

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Tin
0%
Copper
0%
Zinc
0%
Mercury

In the refining of copper, pure copper is deposited at:

0%
Anode
0%
Cathode
0%
A and B both
0%
None of these

Which one of the following pairs of substances on reaction will not evolve

$H_{2}$ gas?

0%
Iron and $H_{2}SO_{4}$ (aq.)
0%
Iron and steam
0%
Copper and $HCl$ (aq.)
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Sodium and ethanol

Which of the following statement(s) is/are correct regarding ionic compounds?

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They are good conductors of electricity at room temperature
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They are always more soluble in water than petrol
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They consists of ions
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They generally have high melting and boiling points

On strong heating, zinc metal burns in presence of air to form :

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zinc chloride
0%
zinc sulphide
0%
zinc oxide
0%
zinc hydroxide

Explanation

Zinc metal burns in air only on strong heating to form zinc oxide.

$Zinc + Oxygen \xrightarrow{\Delta} Zinc\,oxide$

$2Zn + O_2 \xrightarrow{\Delta} 2ZnO$

Compare metals and non-metals with particular emphasis on solubility:

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Both dissolve in solvent
0%
None of them dissolve in solvent
0%
Metal dissolve while non-metal do not dissolve in solvent
0%
Non-metal dissolve while metal do not dissolve in solvent

On reaction with water, metal produces:

0%
oxygen
0%
nitric acid
0%
base
0%
metal oxide
0%
none of the above

Corrosion can not be prevented by which of the following method?

0%
Galvanisation
0%
Create a barrier between the object being corroded and oxygen
0%
Painting
0%
Exposing it to sunlight

Explanation

Corrosion can be prevented by creating a barrier between the object and oxygen. Galvanisation is a process to prevent corrosion and so is painting. However, exposing to sunlight is not a method to prevent corrosion.

Thus, option

$D$ is correct.

Why the grills of doors and windows are always painted before used?

0%
To look beautiful
0%
To avoid corroison
0%
To protect from rain
0%
To protect from sunlight

Identify the metal that occurs in both combined and native state in nature.

0%
Potassium
0%
Copper
0%
Aluminium
0%
Zinc

Name a metal that does not react with dil.

$HCl$ or

$H_2SO_4$ .

0%
Copper
0%
Silver
0%
Gold
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All of the above

Compare the physical properties of metals and non-metals in general regarding malleability.

0%
Both are malleable
0%
None are malleable
0%
Only metals are malleable
0%
Only non-metals are malleable

Which of the following is true for electrolytic refining?

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Pure metal is anode and impure metal is cathode
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Pure metal is cathode and impure metal is anode
0%
Both are anode
0%
Both are cathode

What will you observe when copper (

$Cu$ ) is kept in hydrochloric acid (

$HCl$ )?

0%
Slow release of $H_2$ gas
0%
Vigorous release of $H_2$ gas
0%
Release of water in the form of vapour.
0%
No reaction

Explanation

The reactivity series follows the order:

$Pb>H>Cu$

Thus, $Cu$ is below hydrogen and can't displace it. Therefore, no reaction would take place between $Cu$ and $HCl$ .

No rusting takes place in absence of moisture.

0%
True
0%
False

In the metallurgical process for the electro-refining of the metal, the anode is made of ______ metal.

0%
impure
0%
pure
0%
refine
0%
none of these

Explanation

Electrorefining of Metals: Metals such as

$Cu, Ag, Zn, Sn, Pb, Al, Ni, Cr$ are purified by this method. The impure metal is used as the anode of an electrolytic cell, while the cathode is a thin plate of pure metal. The electrolyte is the solution of a double salt of the metal. On passing electric current, pure metal from the anode dissolves and gets deposited at the cathode. The soluble impurities go into the solution while insoluble or less electropositive impurities settle down below the anode as anode mud or sludge.

In the electrolytic refining of zinc,

0%
graphite is at the anode.
0%
the impure metal is at the cathode.
0%
the metal ions get reduced at the anode.
0%
acidified zinc sulphate is the electrolyte.

Explanation

In the electrolytic refining of zinc:

Anode: Impure zinc

Cathode: Strip of pure zinc

Electrolyte: Acidified zinc sulphate solution

At the anode, oxidation of metal occurs.

$Zn \longrightarrow Zn^{2+} + 2e^–$

At the cathode, reduction of metal ions takes place.

$Zn^{2+} + 2e^– \longrightarrow Zn$

Metals generally react with water to form corresponding oxides or hydroxides and:

0%
hydrogen
0%
oxygen
0%
carbon dioxide
0%
carbon monoxide

Explanation

Metals react with water to form metal oxides or metal hydroxide and hydrogen.

Some examples are shown:

$2Na + 2H_2O \rightarrow 2NaOH +H_2$

$2K + 2H_2O \rightarrow 2KOH +H_2$

$2Al + 3H_2O \rightarrow Al_2O_3 +3H_2$

Thus, Option

$A$ is correct.

Door locks are made of metals because metals:

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have lustre
0%
are opaque
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are good conductors of heat
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are hard and strong

1 kg of iron occupies less space compared to 1 kg of sponge. Why?

0%
Iron has less density than sponge
0%
Iron and sponge have equal densities
0%
Iron has more density than sponge
0%
None of the above

Explanation

We have 2 materials here in which iron is metal and Sponge is non-metal.

Metals have usually high density as compared to non-metals.

$Density \times Volume = Mass$

Iron occupies less space because it has high density.

Corrosion of iron forms:

0%
Mud
0%
Dust
0%
Rust
0%
Water

Which chemical reaction correctly represents the reaction between iron and dilute

$H_2SO_4$ ?

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$Fe + H_2SO_4 \rightarrow FeSO_4 + H_2$
0%
$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4) + 3H_2$
0%
$2Fe + 3H_2SO_4 \rightarrow Fe_2(SO_4)_3 + H_2$
0%
$2Fe + H_2SO_4 \rightarrow Fe_2(SO_4)_3 + 3H_2$

Explanation

When Fe reacts with dilute

$H_2SO_4$ , ferrous (II) sulphate is formed with the evolution of hydrogen gas.

$Fe + H_2SO_4 \to FeSO_4 + H_2$

Hence, the correct option is

$\text A$ .

Name one metal that will not react with cold water but will react with steam.

0%
Zinc
0%
Silver
0%
Calcium
0%
Magnesium

Explanation

Zinc is a metal which doesn't react with cold water but reacts with steam.

The chemical equation for the reaction can be written as:

$Zn + H_{2}O \rightarrow ZnO + H_{2}$
(steam)

Hence, option A is correct.

CBSE Questions for Class 10 Chemistry Metals And Non Metals Quiz 3 - MCQExams.com

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Practice Class 10 Chemistry Quiz Questions and Answers

CBSE Questions for Class 10 Chemistry Metals And Non Metals Quiz 3 - MCQExams.com

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Practice Class 10 Chemistry Quiz Questions and Answers

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