Tag: group 16 elements - trends in chemical properties

Questions Related to group 16 elements - trends in chemical properties

________ bacteria are microbes that work in the absence of oxygen.

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

  1. Anaerobic

  2. Aerobic

  3. Gram-positive 

  4. Gram-negative

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Correct Option: A
Explanation:
Anaerobic bacteria works in the absence of oxygen. 
Example is yeast.

What is the symbol for the element oxygen?

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

  1. $Os$

  2. $O$

  3. $Ox$

  4. $Ge$

  5. $N$

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Correct Option: B
Explanation:
$O$ is the symbol for oxygen. It is having the atomic number 8. It is a highly reactive non  metal. It has oxidising nature.

Which one of the following elements is not detected by Lassaigne's test?

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

  1. Sulphur

  2. Nitrogen

  3. Oxygen

  4. Chlorine

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Correct Option: C
Explanation:

It is a general test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal. 

State True or False.
Before 1961, the atomic weight standard for elements was based on oxygen and not carbon.

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: A
Explanation:

True.

Before 1961, oxygen was used as the reference standard, with an assigned value of 16. The unit of atomic mass was thereby defined as $ 1/16$ the mass of an oxygen atom.

The most abundant non-metal in the 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. chlorine

  2. hydrogen

  3. silicon

  4. oxygen

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Correct Option: D
Explanation:

Aluminium is the first most abundant metal while iron is the second most abundant metal on earth. It is the fourth most common element in the earth's crust. Oxygen is the most abundant non metal and second is silicon present on earth's crust.

The element name 'oxygen' comes from Greek words which means: 

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

  1. Fire-starter

  2. Rust

  3. Air

  4. Acid-producing

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Correct Option: D
Explanation:

The element name "oxygen" came from the greek words $oxys$ and $genes$, which together mean $"acid \ forming"$.

Statement 1: By mass, oxygen is the most abundant element in the human body.
Statement 2: It is principally found as $O _2$ in the bloodstream.

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

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.

  3. Statement 1 is correct, but Statement 2 is not correct.

  4. Statement 1 is not correct, but Statement 2 is correct.

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Correct Option: C
Explanation:

By mass, oxygen is the most abundant element in the human body.

Oxygen is found in the human body as oxy-haemoglobin in the bloodstream but not as $O _2$

So statement 1 is correct but not 2.
Hence option C is correct.

Which of the following has highest ionic radius :

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

  1. $F^-$

  2. $B^{3+}$

  3. $O^{2-}$

  4. $Li^+$

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Correct Option: C
Explanation:

Anions are of larger radius than neutral atom and smallest is cation
$O^{3-}  >  F^-  >  Li^+  >  Bi^{3+}$

Which of the following is illustration of pyrosilicate?

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

  1. Zircon

  2. Hemimorphite

  3. Beryl

  4. Asbestos

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Correct Option: A
Explanation:
Zircon is a pyrosilicate named as Zirconium silicate whose chemical formula is  $ZrSiO _4$.Which is used  as gem stone.
Hence option  A is correct.

Chalcogens are :

chemistry metallurgy group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

  1. hydrocarbons

  2. ore forming elements

  3. oxide forming elements

  4. those having ability to catenate

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Correct Option: B
Explanation:

The chalcogen means "ore former," derived from the Greek words chalcos ("ore") and -gen ("formation").