Answer:- C. H
Explanations:- Reduction is gain of electron. In other words we could say that decrease in oxidation number is reduction.
As per the rules, oxidation number of hydrogen in its compounds is +1(except metal hydrides) and the oxidation number of oxygen in its compounds is -2.
The oxidation number in elemental form is zero. 
In 
 , the oxidation number of H is +1 and oxidation number of O is -2. Oxidation number of Cl in 
 is -1. On product side, the oxidation number of hydrogen in 
 is zero and in 
 the oxidation number of H is +1 and that of O is -2. Oxidation number of Cl in 
 is 0. 
From above data, Oxidation number of O is -2 on both sides so it is not reduced.
Oxidation number of Cl is changing from -1 to 0 which is oxidation.
Oxidation number of H is changing from +1 to 0 which is reduction.
So, the right choice is C.H
 
        
             
        
        
        
The distance from one crest to another crest or from one trough to another trough is called wavelength. Hope it helps
        
                    
             
        
        
        
Your closes answer would be a.10
        
                    
             
        
        
        
<u>a) Answer: </u>
<em>Number of molecules in 1 mole</em>
<u>Explanation:</u>
a) Whether we take any of the substance among all three of the given substances they will have the same number of molecules in 1 mole of the substance is considered and the value for this will be 
<u>b)  Answer: </u>
<em>In the given question </em><em>mass of the substance</em><em> which is </em><em>greatest</em><em> is asked for </em><em>one mole</em><em> and we also know that </em><em>mass of one mole is given by molar mass.  </em>
<u>Explanation:</u>
b) It is known that 
 is the molar mass for oxygen which is greater than that of hydrogen while fluorine has a molar mass of 
 which on comparison shows that, it is the highest amongst all three. 
 
        
             
        
        
        
Answer:
Explanation:
It's because of the sun! Bananas are curved so they can retrieve sunlight.