Tag: group 16 elements - trends in chemical properties

Questions Related to group 16 elements - trends in chemical properties

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.

Which element is not considered as chalcogen?

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

  1. Selenium

  2. Oxygen

  3. Sulphur

  4. Polonium

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Correct Option: D
Explanation:

In group $16$, the oxygen, sulphur, selenium are called chalcogens (ore-forming) while polonium being radioactive forms a less number of compounds and is not considered as chalcogens.

The properties like ionization potential, electronegativity, electron affinity and power of the catenation of the member in a group depend on many factors. For example, the smaller the size of the atom greater will be the ionization potential. At the same time symmetry in the electronic configuration of the elements also play a part in their ionization energy. Smaller the atomic size, greater will be the mutual electronic repulsion and lesser will be electron affinity. Similarly, the catenation which is a direct result of M - M bond strength is also affected by similar considerations.

The correct decreasing order of catenation among group $16$ elements is _________.

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

  1. $O > S > Se > Te$

  2. $S > O > Se > Te$

  3. $S > Se > Te > O$

  4. $S > Se > O > Te$

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Correct Option: D
Explanation:

Power of self-catenation generally depends on bond strength (of M - M bond), so the decreasing order of catenation is :


                                  $S$               >                      $Se$           >          $ O$            >                $ Te$
Bond energy               226                                  172                       142                       126
($ kJ mol^{-1}$) 

The bond energy values generally decrease down the group But because of the very small size and consequent mutual inter electronic repulsion oxygen has lower bond energy than $S$ and $Se.$ Due to the large size, $Te - Te$ bond is the weakest.

Therefore, the correct decreasing order of catenation is- 

Which of the following gas is heavier than air?

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

  1. $N _2$

  2. $O _2$

  3. $CO _2$

  4. $H _2$

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Correct Option: B,C
Explanation:

The molecular weights of the $N _2,O _2,CO _2,H _2$ are 28,32,44,2 respectively

So $CO _2$ is heavier than air ($O _2$)
Hence option $C$ is correct.

Which of the following elements behaves as a typical non metal?

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

  1. S

  2. Se

  3. Te

  4. Po

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Correct Option: A
Explanation:

In VI A group elements metallic properties increases down the group 
$\therefore $ O,S behave as typical non-metal.

Ozone belongs to which groups of the periodic table?

biology natural resources - air, water and land group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. IV

  2. V

  3. VI

  4. VII

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Correct Option: C
Explanation:

$O _3$ is an allotrope of oxygen and hence, it belongs to VI A group.

Which of the following does not have oxygen?

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

  1. Glass

  2. Limestone

  3. Carbohydrates

  4. Ammonia

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Correct Option: D
Explanation:

Glass is made up of silicates, limestone is calcium carbonate. Ammonia does not contain oxygen. 

Nearly half the mass of earth's crust is ________ .

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

  1. oxygen

  2. nitrogen

  3. hydrogen

  4. none of the above

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Correct Option: A
Explanation:

Nearly half the mass of earth's crust is oxygen in the form of silicates, limestone, metallic nitrates. 

Occurrence of oxygen is in:

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

  1. silicates

  2. pencil lead

  3. ammonia

  4. carbohydrates

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Correct Option: A,D
Explanation:

Oxygen occurs in silicates and carbohydrates.