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Questions Related to chemistry

The final product in the following reaction can be used as, $4CH _3-CH _2-Cl+4Na+Pb \rightarrow$

chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

  1. anaesthatic

  2. narcotics

  3. analgesic

  4. antiknocking agent

Show answer
Correct Option: D
Explanation:

  • The final product of this reaction is $(CH _3CH _2) _4Pb$ [tetraethyl lead (TEL)].
$4CH _3-CH _2-Cl + 4Na + Pb \rightarrow (CH _3CH _2) _4Pb$
It is also used as an antiknocking agent in fuels for automobiles.

Group 16 elements have a lower value of first ionization enthalpy as compared to group 15 elements because:

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

  1. half filled p-orbitals in group 15 elements are more stable

  2. group 16 elements have smaller size than group 15 elements

  3. group 16 elements contain double bond while group 15 elements have a triple bond

  4. group 16 elements have more number of electrons in p-orbitals

Show answer
Correct Option: A
Explanation:

Group 16 elements have a lower value of first ionization enthalpy as compared to group 15 elements. As group 15 elements have half filled p-orbital due to which group 15 have got extra stability.

_______ group elements are known as chalcogens.

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

  1. VIA

  2. VA

  3. Zero

  4. None of these

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Correct Option: A
Explanation:

VIA group or Group 16 elements belong to the oxygen family are also called chalcogens. The name is derived from the Greek word 'chalcos', which means 'ore' and 'gen', which means 'formation'. 

A group 16 element exists in the monoatomic state in the metallic lattices. It also exists in two crystalline forms. The metal is:

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

  1. Po

  2. S

  3. Se

  4. Te

Show answer
Correct Option: A
Explanation:

polonium has two metallic allotropes, the $\alpha $ atom has the simple cubic structure in a single atom basis at STP and $\beta $ atom of it has rhombohedral structure. Po belongs to group 16.

Arrange the following elements in order of their increasing ionisation energies $O, S, Se, Te, Po$ :

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

  1. $Se, Te, S, Po, O$

  2. $O, S, Se, Te, Po$

  3. $Po, Te, Se, S, O$

  4. $Te, O, S, Po, Se$

Show answer
Correct Option: C
Explanation:

Ionisation energy decreases from top to bottom in a group. So increasing order will be
Po < Te < Se < S < O

Which is the following order is INCORRECT?

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

  1. ${ Na } _{ 2 }O<{ SiO } _{ 2 }<{ Cl } _{ 2 }{ O } _{ 7 }$ Acidic character order

  2. ${ PH } _{ 3 }<{ AsH } _{ 3 }<{ SbH } _{ 3 }$ basic character order

  3. ${ PH } _{ 3 }<{ AsH } _{ 3 }={ SbH } _{ 3 }$ acidic character order

  4. $I{ EA } _{ 1 }$>$I{ EA } _{ 2 }$>$I{ EA } _{ 1 }$ Successive electron affinity order.

Show answer
Correct Option: B

Group $16$ element are called:

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

  1. Carbon family

  2. Chalcogen family

  3. Halogen family

  4. Nitrogen family

Show answer
Correct Option: B
Explanation:
The chalcogens are the chemical elements in the group $16$ of the periodic table. 

This group is also known as the oxygen family. It consists of the elements oxygen, sulfur, selenium, tellurium, and the radioactive element polonium. 

Hence, the correct answer is option $B$.

Which of the following is not a chalcogen?

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

  1. $Se$

  2. $O$

  3. $S$

  4. $Na$

Show answer
Correct Option: D
Explanation:

Oxygen family is known as the chalcogen group.


So, $Na$ is not a chalcogen as it belongs to the alkali metal family.

Therefore, correct option is D.

Oxygen is the most abundant metal in the earth's crust.
chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. True

  2. False

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Correct Option: B
Explanation:

Aluminum is the most abundant metal in the earth's crust. Oxygen is not a metal.

Which of the following sets of atomic numbers belongs to chalcogens?

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

  1. 8, 52, 84

  2. 9, 17, 35

  3. 20, 37, 56

  4. 14, 32, 50

Show answer
Correct Option: A
Explanation:



$\underset{VI group elements so belongs to chalcogens}{\underbrace{  8:oxygen   52:Tellurium   84:Polonium}} $