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Test: Halogen and Noble Gas Family - Chemistry MCQ


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10 Questions MCQ Test - Test: Halogen and Noble Gas Family

Test: Halogen and Noble Gas Family for Chemistry 2024 is part of Chemistry preparation. The Test: Halogen and Noble Gas Family questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Halogen and Noble Gas Family MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Halogen and Noble Gas Family below.
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Test: Halogen and Noble Gas Family - Question 1

What is the electron gain enthalpy for noble gases?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 1

Noble gases have completely filled subshells. As a result, there is no vacant room in their valence shell and hence the additional electron has to be placed in an orbital of the next higher shell. Therefore, energy has to be supplied in order to add an electron and so, the electron gain enthalpy of noble gases is positive (> 0).

Test: Halogen and Noble Gas Family - Question 2

What is the boiling point of Helium?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 2

The melting and boiling points of noble gases are very low. This is because the atoms are held together by very weak Van der Waals forces of attraction in both liquid and solid states. Helium has the lowest boiling point, equal to 4.2 K, among all known substances.

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Test: Halogen and Noble Gas Family - Question 3

Which of the following noble gases is most soluble in water?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 3

Of all the noble gases, radon is the most soluble in water. Noble gases are non-polar substance, however, when dissolved in water, they are slightly soluble. This is due to dipole induced dipole interactions.

Test: Halogen and Noble Gas Family - Question 4

Which of the following noble gases can diffuse through rubber?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 4

Helium is the lightest and the smallest noble gas, having an atomic number of 2. Owing to its small size and inert nature, it has the unusual property of diffusing through most commonly used laboratory materials such as rubber, glass or plastic.

Test: Halogen and Noble Gas Family - Question 5

Which among the following noble gases does not form clathrates?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 5

Noble gases can form compounds in which the gases are entrapped in the cavities of crystal lattices. Such compounds are called clathrates. Only Argon, Krypton, Xenon and Radon are known to form clathrates among the noble gases.

Test: Halogen and Noble Gas Family - Question 6

What is the general electronic configuration of the halogens?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 6

The elements of group 17 have seven electrons in the valence shell and hence their general electronic configuration is ns2np5, i.e., ns2npx2npy2npz1 where n = 2-6. Thus, they contain one electron less than the nearest inert gas configuration.

Test: Halogen and Noble Gas Family - Question 7

What is the correct order of enthalpy of dissociation of halogens?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 7

Enthalpy of dissociation decreases as the bond distance increases from F2 to I2 due to a corresponding increase in the size of the atom as we move down the group from F to I. The F-F bond dissociation enthalpy is, however, smaller than that of Cl-Cl and even smaller than that of Br-Br. This is due to the reason that F atom is very small and hence the electron-electron repulsions between the lone pairs of electrons are very large.

Test: Halogen and Noble Gas Family - Question 8

What is the atomicity of halogens?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 8

Each halogen has one electron less than the nearest inert gas. As a result, halogens are very reactive elements. They readily share their single unpaired electron with other atoms to form covalent bonds. Thus, all halogens exist as diatomic molecules.

Test: Halogen and Noble Gas Family - Question 9

Who discovered the element chlorine?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 9

Chlorine was discovered in 1774 by Carl Wilhelm Scheele by heating HCl with MnO2. In 1810, Davy established its elementary nature and suggested the name chlorine on the basis of its colour (Greek, chloros = greenish yellow).

Test: Halogen and Noble Gas Family - Question 10

Which of the following halogen exists as a solid at room temperature?

Detailed Solution for Test: Halogen and Noble Gas Family - Question 10

Iodine  exists as solid at room temperature.

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