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Test: Periodic Classification of Elements - SSC CGL MCQ


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15 Questions MCQ Test - Test: Periodic Classification of Elements

Test: Periodic Classification of Elements for SSC CGL 2024 is part of SSC CGL preparation. The Test: Periodic Classification of Elements questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Periodic Classification of Elements MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Periodic Classification of Elements below.
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Test: Periodic Classification of Elements - Question 1

What is the fundamental difference between Mendeleev's periodic law and the modern periodic law?

Detailed Solution for Test: Periodic Classification of Elements - Question 1

Mendeleev's periodic law was based on atomic masses, whereas the modern periodic law, proposed by Moseley, is based on atomic numbers. Moseley's discovery emphasized that the properties of elements are better understood in relation to their atomic numbers rather than atomic masses.

Test: Periodic Classification of Elements - Question 2

How are elements classified in the periodic table based on their electronic configuration?

Detailed Solution for Test: Periodic Classification of Elements - Question 2

Elements are classified in the periodic table based on their electronic configuration by the number of outermost shells. This classification helps in organizing elements according to their properties and relationships with other elements.

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Test: Periodic Classification of Elements - Question 3

Which group of elements in the periodic table includes metals, non-metals, and metalloids?

Detailed Solution for Test: Periodic Classification of Elements - Question 3

The p-Block elements in the periodic table include a variety of elements such as metals, non-metals, and metalloids. This block spans groups 13 to 18 and exhibits diverse properties depending on the element's position within the block.

Test: Periodic Classification of Elements - Question 4

The general electronic configuration of d-block elements is:

Detailed Solution for Test: Periodic Classification of Elements - Question 4

The correct option is C
ns0−2 (n−1)d1−10
(n-1)d has to be filled and the ns orbital may or may not be filled.
(n-1)d orbital has a lower energy than the ns orbital.

Test: Periodic Classification of Elements - Question 5

Which element, temporarily named ununseptium, belongs to group 17 in the periodic table?

Detailed Solution for Test: Periodic Classification of Elements - Question 5

Ununseptium, a new super heavy element, belongs to group 17 in the periodic table. This element was created and observed by researchers at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt, Germany.

Test: Periodic Classification of Elements - Question 6

Which periodic property is defined as the ability of an atom to attract a shared pair of electrons towards itself?

Detailed Solution for Test: Periodic Classification of Elements - Question 6

Electronegativity is the periodic property that describes an atom's ability to attract a shared pair of electrons towards itself. This property increases along a period and decreases down a group. It is an essential concept in understanding chemical bonding and the behavior of elements in compounds.

Test: Periodic Classification of Elements - Question 7

How does the metallic character of elements change as you move along a period in the periodic table?

Detailed Solution for Test: Periodic Classification of Elements - Question 7

Metallic character decreases along a period in the periodic table. This means that elements become less metallic in nature as you move from left to right across a period. Metallic character is related to an element's tendency to form cations by losing electrons.

Test: Periodic Classification of Elements - Question 8

Which trend correctly describes the valency of elements with respect to hydrogen across a period?

Detailed Solution for Test: Periodic Classification of Elements - Question 8

The valency of elements with respect to hydrogen increases from 1 to 7 across a period. Valency is the combining power of an element, indicating the number of hydrogen atoms with which one atom of an element can combine.

Test: Periodic Classification of Elements - Question 9

How does the basic nature of oxides change along a group in the periodic table?

Detailed Solution for Test: Periodic Classification of Elements - Question 9

The basic nature of oxides increases along a group in the periodic table. This means that as you move down a group, the oxides of elements exhibit more basic properties. Basic oxides typically react with acids to form salts and water.

Test: Periodic Classification of Elements - Question 10

What happens to the reducing character of elements as you move along a period in the periodic table?

Detailed Solution for Test: Periodic Classification of Elements - Question 10

The reducing character of elements decreases along a period in the periodic table. This means that elements have a lower tendency to act as reducing agents (to donate electrons) as you move from left to right across a period.

Test: Periodic Classification of Elements - Question 11

What is the most abundant element in the universe by mass?

Detailed Solution for Test: Periodic Classification of Elements - Question 11

Hydrogen is the most abundant element in the universe by mass, making up approximately 70% of the total mass of the universe. This abundance of hydrogen is due to its presence in stars, including our sun, and its fundamental role in the composition of living organisms as well.

Test: Periodic Classification of Elements - Question 12

Which type of water does not form lather with soap due to the presence of calcium or magnesium compounds?

Detailed Solution for Test: Periodic Classification of Elements - Question 12

Hard water does not form lather with soap due to the presence of calcium or magnesium compounds, which cause the hardness. This characteristic of hard water is a result of the minerals it contains and can have implications for various household and industrial applications.

Test: Periodic Classification of Elements - Question 13

What is the rare and radioactive isotope of hydrogen with a mass number of 3 and a half-life of 12.4 years?

Detailed Solution for Test: Periodic Classification of Elements - Question 13

Tritium is a rare and radioactive isotope of hydrogen with a mass number of 3 and an atomic number of 1. It has a relatively short half-life of 12.4 years and is used in various applications, including as a tracer in scientific research.

Test: Periodic Classification of Elements - Question 14

Which form of hydrogen is more reactive than molecular hydrogen and appears suddenly during a chemical reaction?

Detailed Solution for Test: Periodic Classification of Elements - Question 14

Nascent hydrogen is more reactive than molecular hydrogen and appears suddenly during a chemical reaction. This form of hydrogen exhibits enhanced reactivity due to its freshly formed state, making it important in various chemical processes and industrial applications.

Test: Periodic Classification of Elements - Question 15

What is the colorless, odorless, and tasteless liquid with a higher density than ordinary water due to the presence of deuterium?

Detailed Solution for Test: Periodic Classification of Elements - Question 15

Heavy water is a colorless, odorless, and tasteless liquid with a higher density than ordinary water, attributed to the presence of deuterium. It has unique physical properties and is utilized in various scientific and industrial applications due to its isotopic composition.

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