Test: Compounds of Hydrogen

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Which fluid compartment contains about 67% (by volume) of all body water?


Intracellular fluid (2/3 of body water) is fluid contained within cells. In a 72-kg body containing 40 litres of fluid, about 25 litres is intracellular, which amounts to 62.5%. Jackson's texts states 70% of body fluid is intracellular.


Which of the following is the product of the given reaction?
P4O10 (s) + H2O(I) →


P4O10 (s) + H2O (l) → H3PO4
Phosphoric acid is a weak acid with the chemical formula H₃PO₄. Orthophosphoric acid refers to phosphoric acid, which is the IUPAC name for this compound. The prefix ortho- is used to distinguish the acid from related phosphoric acids, called polyphosphoric acids.


Decomposition of H2O2 yields:


2H2O2 → 2H2O + O2
The decomposition of hydrogen peroxide to produce oxygen and water. Laboratory method receiving of oxygen. This reaction takes place at a temperature of over 150°C or at room temperature and in the presence of a catalyst. In this reaction, the catalyst is can be sodium hydroxide, manganese(IV) oxide, platinum, copper.


10 volume of H2O2 means:


Volume strength: This tells about the release of oxygen by 1 mL of hydrogen peroxide solution. Like, 10 volume of ​ H2O2 means, 1 mL of this solution will release 10 mL of oxygen.


Which of the following is an incorrect statement?

  • Temporary hardness is caused by the presence of dissolved bicarbonates of calcium, magnesium, and other heavy metals and the bicarbonates of iron. 
  • The salts responsible for temporary hardness are Ca(HCO3)2 , Mg(HCO3) Permanent hardness is due to presence of dissolved chlorides and sulphates of calcium, magnesium, iron and other heavy metals. 
  • Temporary hardness is removed by boiling known as clark’s method. Permanent hardness cannot be removed by boiling so in that case we have to use ion exchange method and calgon’s method.

H2O2 can be used as:


Uses of Hydrogen Peroxide:
(i) Antiseptic 
Hydrogen Peroxide has been used as an antiseptic for minor cuts, bruises, laceration etc for years. It actually foams when it comes in contact with blood. This helps in bringing up all the germs from within the cut. 
(ii) Bleaching
Hydrogen peroxide is extensively used for bleaching purposes. This also comes down to the oxidizing abilities of H2O2 . When a large organic molecule has a double bond this bond absorbs light.
(iii) Pollution Control Agent
Perhaps the most significant use of Hydrogen Peroxide is in environmental protection. It finds a use in air pollution control where it is used to treat effluents from industrial waste. It is also used in the restoration of aerobic conditions to sewage and industrial waste materials.


On an industrial scale, H2O2 is prepared by oxidation of:


H2Ois prepared industrially by oxidation of 2-ethylanthraquinol as it is very cheap.


Which of the following statements is correct?


Tempo​rary hardness: It is due to the presence of soluble bicarbonates of calcium and magnesium. It can be removed by boiling. During boiling, the soluble Mg(HCO3)present in water is converted into insoluble Mg(OH)2 and Ca(HCO3)2 is changed to insoluble CaCO3 which settle at the bottom as precipitates. These precipitates can be removed by filtration. Filtrate thus obtained will be soft water.


H2O2 can act as:


Hydrogen peroxide acts as both a reducing agent and oxidizing agent depending upon the nature of the reacting species. When H2O2 serves as an oxidizing agent, the oxygen of hydrogen peroxide (that is present in -1 oxidation state) is reduced to H2O (-2 oxidation state).


Water has maximum density at:


The maximum density of water occurs at 4 °C because at this temperature two opposing effects are in balance.
Explanation: In ice, the water molecules are in a crystal lattice that has a lot of empty space. When the ice melts to liquid water, the structure collapses and the density of the liquid increases.

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