Bohr S Model For Hydrogen Atom

Heavy water, , is used as a neutron moderator in nuclear reactors. It has a higher neutron absorption cross-section than regular water, making it more effective for slowing down neutrons. However, it is less common for other uses compared to ordinary water.

Step 2: Conclusion.
The correct statement is that heavy water is used as a moderator in nuclear reactors, corresponding to option (a).

Energy values are additives. or or or On solving

The volume strength of hydrogen peroxide solution is calculated by the formula: Substituting the given normality of 1.5, we get the volume strength as 8.4.

As,

or,
or,

or
Given

Substituting these values in equation .

or

Deep sea divers use a mixture of oxygen and helium (heliox) to prevent nitrogen narcosis and other problems associated with breathing compressed air at great depths.
Final Answer: