Tag: p- block elements-ii

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

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

  1. $16$
  2. $5$
  3. $18$
  4. $24$
Reveal answer Fill a bubble to check yourself
C Correct answer
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:

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

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

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.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

All the elements in oxygen family are:

  1. Non-metal

  2. Mettaloids

  3. Radioactive

  4. Polymorphic
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the element is most poisonous to human?

  1. $O$
  2. $S$
  3. $Se$

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.