Tag: group 16 elements - trends in chemical properties

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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

Which of the following is the correct order of melting points of group $16$ elements?

  1. $O<S<Se<Te<Po$
  2. $O<Se<S<Te<Po$
  3. $O < S < Se < Te > Po$
  4. $O < S < Se >Te < Po$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The melting points of group 16 elements generally increase down the group due to increasing van der Waals forces, but there are irregularities. The correct trend is O < S < Se < Te > Po.

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

Only one element of _______form hydride.

  1. group 6

  2. group 7

  3. group 8

  4. group 9
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only one element of chromium from group $6$,that is $CrH$.

So,the answer is only one element of group $6$ forms hydrites.
These type of hybrides are classified into metalic or non-stoichiometric type of hydrides.

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

The smog is essentially caused by the presence of 

  1. $ \mathrm { O } _ { 2 } \text { and } \mathrm { O } _ { 3 } $
  2. $ O _ { 3 } \text { and } N _ { 2 } $

  3. Oxides of sulphur and nitrogen
  4. $ O _ { 2 } \text { and } N _ { 2 } $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atmospheric pollutants or gases that form smog are released in the air when fuels are burnt. When sunlight and its heat react with these gases and fine particles in the atmosphere, smog is formed. It is purely caused by air pollution. Ground level ozone and fine particles are released in the air due to complex photochemical reactions between volatile organic compounds (VOC), sulfur dioxide (SO2) and nitrogen oxides (NOx).

These VOC, SO2, and NOx are called precursors. The main sources of these precursors are pollutants released directly into the air by gasoline and diesel-run vehicles, industrial plants and activities, and heating due to human activities

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

In which one of the following reactions, a 16 group element will get precipitated ?

  1. $ Na _2S _2O _3 + CI _2+H _2O \longrightarrow $
  2. $ Na _2SO _3 - CI _2+H _2O \longrightarrow $
  3. $ SO _2+2H _2O+CI _2 \longrightarrow $
  4. $ 2FeSO _4+H _2SO _4+CI _2 \longrightarrow $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the reaction of sodium thiosulfate with chlorine, sulfur is precipitated as a solid product.

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

Among $CH _4, NH _3$ and $H _2O$, acidity of $H _2O$ is maximum because :

  1. Oxygen contains two lone pairs of electrons.
  2. Bond angle on $H _2O$ is less than $109^{\small\circ}28'$ due to $VSEPR$.
  3. Oxygen is more electronegative than $C$ or $N$.
  4. $H _2O$ is an associated liquid.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As oxygen is more electronegative so conjugate base in case of $H _2O$ is more stable and it is more basic than others.


The electronegativity increases along the period. Acidity of hydrides of corresponding elements also increase with increase in electronegativity of these elements. 

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

Identify the group 16 $(VI\space A)$ elements which is the most electronegative ?

  1. $ O $
  2. $ S $
  3. $ Te$
  4. $ Po $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All theses O,S,Se,Te,Po are group 16 elements from top to bottom.As we move from top to bottom in a group as the size increses the electronegativity  decreases.So most electronegative element is Oxygen
The order of electronegativity is O>S >Se>Te.Po.
Hence option A is correct.

Multiple choice chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements
State true or false.

Sulphur is an insulator while selenium and tellurium are semiconductors.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The trend from nonmetallic to metallic character upon going down the group is exemplified by the conductivities of these elements. Sulphur is an insulator, selenium and tellurium are semiconductors.


In addition, the conductivities of sulphur, selenium, and tellurium increase with increasing temperature, behaviour typical of non-metals.