Tag: p- block elements-ii

Questions Related to p- block elements-ii

Which of the following bonds has the highest energy?

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. Se-Se

  2. Te-Te

  3. S-S

  4. O-O

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Correct Option: C
Explanation:

Due to lower size and less electron-electron repulsion, S-S have highest bond energy.

An element X forms an oxide $XO _3$. What is the valency of X?

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. 1

  2. 2

  3. 3

  4. 6

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Correct Option: D
Explanation:

Valency of Oxygen is 2

The colour of mercuric oxide is:

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. blue

  2. pink

  3. red

  4. black

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Correct Option: C
Explanation:

Mercuric chloride is red in colour.

As many as ______ different combinations of water are possible from $H _1^1, H _1^2, H _1^3, O _8^{16}, O _8^{17}, O _8^{17}$ ?

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. $16$

  2. $5$

  3. $18$

  4. $24$

Show answer
Correct Option: C
Explanation:

Different combinations can be used in the preparation of water. Using these isotopes, a total of 18 combinations are possible. At first it might seem that kinds of water with the chemical structure $H _2O$ based on isotope differences only, are 9 in number:

$H^1 _2O^{16}, H^2 _2O^{16}, H^3 _2O^{16},$
$H^1 _2O^{17},H^2 _2O _{17},H^3 _2O^{17},$
$H^1 _2O^{17}, H^2 _2O^{18}, and H^3 _2O^{18}$

However, there are actually 18 differing isotope kinds of water. This is because each of the two hydrogen atoms in a particular molecule can be a different isotope, giving these 9 additional varieties of water:

$H^1H^2O^{16}, H^1H^3O^{16}, H^2H^3O^{16},$
$H^1H^2O^{17}, H^1H^3O^{17}, H^2H^3O^{17},$
$H^1H^2O^{18}, H^1H^3O^{18}, and H^2H^3O^{18}$

Assertion: Dinegative anion of oxygen $(O^{2-})$ is quite common but dinegative anion of sulfur $(S^{2-})$ is less common.

Reason: Covalency of oxygen is two.

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. If both assertion and reason are true and the reason is a correct explanation of the assertion

  2. If both assertion and reason are true but reason is not a correct explanation of the assertion

  3. If the assertion is true but reason is false.

  4. If both the assertion and reason are false

  5. If the assertion is false but the reason is true

Show answer
Correct Option: B
Explanation:

Usually, oxygen forms 2 bonds. So the covalency of oxygen is 2 as in $H _2O$. 


Oxygen is the second most electronegative element after fluorine. So, it can easily gain electrons to form dinegative anion ($O^{2-}$) while sulphur is not so electronegative element as oxygen.

Therefore dinegative anion of oxygen is common because of high electron gain enthalpy.

All the elements of oxygen family are:

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. non-metals

  2. metalloid

  3. radioactive

  4. polymorphic

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Correct Option: A,D
Explanation:

All the elements of oxygen family exist in more than one form (polymorphic).

The allotrope of this element is the primary absorber of UV solar radiation in Earth's atmosphere. The element is:

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. carbon

  2. nitrogen

  3. oxygen

  4. neon

  5. argon

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Correct Option: C
Explanation:

Allotrope of oxygen which is known as ozone, is the primary absorber of UV radiation in arth's atmosphere.

All the elements in oxygen family are:

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. Non-metal

  2. Mettaloids

  3. Radioactive

  4. Polymorphic

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Correct Option: D
Explanation:

All the elements in oxygen family are polymorphic (Polymorphism is the ability a material to exist in two or more forms or crystalline structures of the same chemical compound or element).
Hence option D is correct.

Which of the element is most poisonous to human?

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. $O$

  2. $S$

  3. $Se$

  4. None of above

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Correct Option: C
Explanation:

The long-term intake of excessive selenium may involve either organic or inorganic forms in food or water. Which affects the human health adversely. So it ispoisonous.

Hence option C is correct. 

Oxygen was discovered by:

chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. Priestly

  2. Scheele

  3. Boyle

  4. Cavendish

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Correct Option: A
Explanation:

Joseph Priestley discovered oxygen in 1774, he gave the answers why and how things burn.

Hence option A is correct.