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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 '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....
There are three moles of molecules on the left of the arrow and two on the right.
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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 'D'. Can you explain this answer?
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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 'D'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about 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 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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 'D'. Can you explain this answer?.
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