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Case Based Questions Test: Metals & Non-metals - 2 - Class 10 MCQ


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Case Based Questions Test: Metals & Non-metals - 2 - Question 1

In a thermite reaction, a compound of iron reacts with a metal.

The metal used is:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 1
Aluminium has a unique reduction property which helps in the generation of enormous amounts of heat. This way aluminium helps in joining railway tracks. It's a reaction in which fusion of materials leads to strong bonding and acts like a welded material.
Case Based Questions Test: Metals & Non-metals - 2 - Question 2

After completion of this reaction, a metal is obtained in the molten state. Identify the metal:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 2
Fe2O3 + 2Al ------- Al2O3 + 2Fe,

Here Fe is produced in molten state because a lot of heat is given out which melts there itself the iron produced. The most common use of this reaction is that this reaction is used in combining the railway tracks or cracked machinery parts.

Case Based Questions Test: Metals & Non-metals - 2 - Question 3

The correct equation to justify thermite reaction is:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 3
A thermite reaction is basically iron oxide (rust) reacting with aluminum to produce molten iron. The products are aluminium oxide, elemental iron, and a large amount of heat. The reactants are commonly or thermite mixture is aluminum powder and iron oxide (rust) powder. When the mixture is heated, it starts reacting as the aluminum is more reactive than the iron and aluminium forms stronger and stable bonds with oxygen than iron.
Case Based Questions Test: Metals & Non-metals - 2 - Question 4

The correct name for Fe2O3 is:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 4
Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3.
Case Based Questions Test: Metals & Non-metals - 2 - Question 5

Read the given passage and answer the questions:

Metallic Character: The ability of an atom to donate electrons and form positive ions (cation) is known as electro-positivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size.

Non-Metallic Character: The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electro -negativity increases due to decrease in atomic size.

Which of the following correctly represents the decreasing order of metallic character of Alkali metals plotted in the graph?

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 5
Li, Na, K, Rb, and Cs are all group IA elements, also known as the alkali metals. All the alkali metals are soft and, except for Cs which is yellow, are silvery-gray in color. Lithium, sodium, potassium, rubidium, and cesium have a great many other properties in common.
Case Based Questions Test: Metals & Non-metals - 2 - Question 6

Read the given passage and answer the questions:

Metallic Character: The ability of an atom to donate electrons and form positive ions (cation) is known as electro-positivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size. Non-Metallic Character: The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electro -negativity increases due to decrease in atomic size.

Which of the following has highest electronegativity?

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 6
Electronegativity is the ability of an atom to pull shared pair of electrons towards itself. On moving along a period from left to right, effective nuclear charge increases and atomic size decreases. Hence, the attraction of added electron increases. The position of fluorine is on far-right on the periodic table in group 17th whereas hydrogen, sodium lies in first group and calium in secondth group. Fluorine has highest electronegativity.
Case Based Questions Test: Metals & Non-metals - 2 - Question 7

Read the given passage and answer the questions:

Metallic Character: The ability of an atom to donate electrons and form positive ions (cation) is known as electro-positivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size.

Non-Metallic Character: The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electro -negativity increases due to decrease in atomic size.

Which of the following reasons correctly justifies that “Fluorine (72pm) has a smaller atomic radius than Lithium (152pm)”?

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 7
F and Li are in the same period and across the period atomic size/radius decreases from left to right.
Case Based Questions Test: Metals & Non-metals - 2 - Question 8

Read the given passage and answer the questions:

Metallic Character: The ability of an atom to donate electrons and form positive ions (cation) is known as electro-positivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size. Non-Metallic Character: The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electro -negativity increases due to decrease in atomic size.

Identify the reason for the gradual change in electronegativity in halogens down the group.

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 8
Electronegativity decreases down the group due to increase in atomic radius/ tendency to gain electron decreases.
Case Based Questions Test: Metals & Non-metals - 2 - Question 9

Study the given table and answer the questions:

A student took the samples of four metals A, B, C and D and added the following solutions one by one. The results obtained have been tabulated as follows:

The gas produced when dil. HCl is added to a reactive metal

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 9

Hydrogen gas is liberated when dilute HCl is added to a reactive metal. When dilute HCl reacts with Zinc metal, hydrogen gas is liberated.

Case Based Questions Test: Metals & Non-metals - 2 - Question 10

Read the following passage and answer the questions.

Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.

Which of the following is used for dissolution of gold?

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 10
Aqua Regia is a mixture of concentrated HNO3 and concentrated HCl. It is used for dissolution of gold.
Case Based Questions Test: Metals & Non-metals - 2 - Question 11

Read the following passage and answer the questions.

Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.

Aqua regia dissolves:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 11
As such, it is used to make the electrolyte chloroauric acid for the Wohlwill process for refining gold to 99.999%; which is way beyond 24 carat. Intriguingly, while aqua regia does dissolve gold, platinum, mercury, and other metals it does not dissolve silver, nor iridium.
Case Based Questions Test: Metals & Non-metals - 2 - Question 12

Read the following passage and answer the questions.

During extraction of metals, electrolytic refining is used to obtain pure metals. During the process, the impure metal is made the anode and a thin strip of pure metal is made the cathode. The solution of the metal salt is used as an electrolyte. On passing the current through the electrolyte, the pure metal from the anode dissolves from the electrolyte. An equivalent of pure metal from the electrolyte is deposited on the cathode.

During electrolytic refining of zinc, it gets

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 12
Ions of zinc are positively charged, thus while electrolytic refining of zinc, zinc is deposited at cathode (negatively charged pole).
Case Based Questions Test: Metals & Non-metals - 2 - Question 13

Read the given passage and answer the questions:

Metallic Character: The ability of an atom to donate electrons and form positive ions (cation) is known as electro-positivity or metallic character. Down the group, metallic character increases due to increase in atomic size and across the period, from left to right electropositivity decreases due to decrease in atomic size. Non-Metallic Character: The ability of an atom to accept electrons to form a negative ion (anion) is called non-metallic character or electronegativity. The elements having high electro-negativity have a higher tendency to gain electrons and form anion. Down the group, electronegativity decreases due to increase in atomic size and across the period, from left to right electro -negativity increases due to decrease in atomic size.

Hydrogen is placed along with Alkali metals in the modern periodic table though it shows nonmetallic character:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 13
as Hydrogen can easily lose one electron like alkali metals to form positive ion
Case Based Questions Test: Metals & Non-metals - 2 - Question 14

In a thermite reaction, a compound of iron reacts with a metal.

The correct name for Fe2O3 is:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 14
Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3.
Case Based Questions Test: Metals & Non-metals - 2 - Question 15

After completion of this reaction, a metal is obtained in the molten state. Identify the metal:

Detailed Solution for Case Based Questions Test: Metals & Non-metals - 2 - Question 15
Fe2O3 + 2Al ------- Al2O3 + 2Fe,

Here Fe is produced in molten state because a lot of heat is given out which melts there itself the iron produced. The most common use of this reaction is that this reaction is used in combining the railway tracks or cracked machinery parts.

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