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Class 11 Exam  >  Class 11 Questions  >  Consider the reaction between hydrogen and ox... Start Learning for Free
Consider the reaction between hydrogen and oxygen gases to form water. Which of the following is/are not conserved in the reaction?
2H2(g) + O2(g) → 2H2O(l)​
  • a)
    Atoms
  • b)
    Mass
  • c)
    Both moles of molecules and moles of atoms
  • d)
    Moles of molecules
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Consider the reaction between hydrogen and oxygen gases to form water....
In the equation both side of reaction moles of atoms is conserved ie,both reactant and product contain 4H and 2O but there is 3 (2+1) moles of reactant molecules turns into 2 moles of product molecules. 
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Most Upvoted Answer
Consider the reaction between hydrogen and oxygen gases to form water....
Atoms:
- Atoms are conserved in the reaction between hydrogen and oxygen gases to form water. This means that the total number of atoms of each element present in the reactants is equal to the total number of atoms of each element in the products. In this reaction, there are 4 hydrogen atoms and 2 oxygen atoms on both sides of the equation, ensuring the conservation of atoms.

Mass:
- Mass is conserved in the reaction as well. The total mass of the reactants (hydrogen and oxygen gases) is equal to the total mass of the products (water). This is in accordance with the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction.

Both moles of molecules and moles of atoms:
- Both moles of molecules and moles of atoms are conserved in the reaction. The balanced chemical equation shows that 2 moles of hydrogen molecules react with 1 mole of oxygen molecules to produce 2 moles of water molecules. The moles of atoms are also conserved, as the number of atoms of each element remains the same on both sides of the equation.

Moles of molecules:
- Moles of molecules are conserved in the reaction. The stoichiometry of the balanced equation ensures that the ratio of moles of reactants to moles of products is maintained. In this case, 2 moles of hydrogen molecules react with 1 mole of oxygen molecules to form 2 moles of water molecules. This conservation is crucial for ensuring the validity of the reaction and the stoichiometry involved.
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Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Which one of the following is the correct molecular structure of water molecule?

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. The water molecules attract one another due to the water molecule’s

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Surface tension of water is

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Consider the reaction between hydrogen and oxygen gases to form water. Which of the following is/are not conserved in the reaction?2H2(g) + O2(g) → 2H2O(l)​a)Atomsb)Massc)Both moles of molecules and moles of atomsd)Moles of moleculesCorrect answer is option 'D'. Can you explain this answer?
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