Tag: air and atmosphere

Quizzes (15) Questions (49)

Questions Related to air and atmosphere

Multiple choice chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

If dissolved ______ is not present, the aquatic life would die.

  1. Oxygen

  2. Nitrogen

  3. Hydrogen

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dissolved oxygen means the  free or  non-compound oxygen present in water or in  other liquids. Dissolved oxygen is important to many forms of life including fish, bacteria and plants. These organisms use oxygen in respiration, similar to organisms on land. Fishes obtain oxygen for respiration through their gills, while plant life and phytoplankton require dissolved oxygen for respiration when there is no light for photosynthesis.

So the given statement If dissolved oxygen is not present, the aquatic life would die.

Multiple choice chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

In the following reaction, $O^{18}$ is in what?
$2MnO _4{^-}+5H _2O^{18} _2+6H^+\rightarrow 2Mn^{2+}+8H _2O+5O _2$ 

  1. $H _2O$
  2. $O _2$
  3. Both $(A)$ and $(B)$

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
${ 2MnO } _{ 4 }^{ - }+5{ H } _{ 2 }{ O } _{ 2 }^{ 18 }+6{ H }^{ + }\longrightarrow 2{ Mn }^{ 2+ }+8{ H } _{ 2 }O+5{ O } _{ 2 }$
In the following reaction ${ O }^{ 18 }$ labelled isotope is in ${ O } _{ 2 }$.