Terrestrial hydrogen contains 0.0156 percent of deuterium mostly in the form of HD. What does HD stand for?

Q. Give reasons

1. GDP is an indicator of HD.

2. India stands in the medium HD Groups countries.

Q. Arrange the bond energy of $H_a,H_b,H_c\text{and}{H}_d$ in decreasing order.

Q. Assume that you have a sample of a gas containing $H_2,HD$ and $D_2$ that you want to separate into pure components $(H={}^{1}H\text{and}D={}^{2}H)$. What are the relative rates of diffusion of the three gases according to Graham’s law?

Q. Distinguish between the following.

1. High HD Group and Low HD Group.

2. HDI and PQLI.