Thorium is not being used as the nuclear fuel in a big way as is the case with Uranium Which of...........

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Thorium is not being used as the nuclear fuel in a big way as is the case with Uranium. Which of the following statements are true about lesser use of thorium as the nuclear fuel?

1. Thorium is less abundant than uranium

2. Thorium is not safer as it is more radioactive than uranium

3. Less research has taken place in case of thorium as nuclear fuel in comparison to uranium

4. Thorium is more fissile than uranium

5. Thorium does not work as a fuel without mixing with substantial quantities of either U-235 or Pu-239

Codes:

3 and 5 are true

1, 2 and 5 only

2, 3 and 5 only

All of the above

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Explanation:

1st, 2nd and 4th statements are incorrect.

1st statement is incorrect. Thorium is more abundant in Earth's crust than Uranium, at a concentration of 0.0006% vs. 0.00018% for Uranium (factor of 3.3x).

2nd statement is incorrect because Thorium is more safer than Uranium.

4th is incorrect because Thorium is less fissile than Uranium.