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Standard VII

Chemistry

Sub-Atomic Particles

1 g of U-235 ...

Question

1 g of U-235 is converted into ${U F}_{6}$ . The radioactivity of ${U F}_{6}$ thus obtained is :

zero

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less than that of 1 g of U-235

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more than that of 1 g of U-235

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same as that of 1 g of U-235

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Solution

The correct option is D same as that of 1 g of U-235
Radioactivity does not depend upon the state of combination so it remains unaffected.

Therefore, it will be the same as that of 1 g of U-235.

Hence, option D is correct.

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Similar questions

Q. Assuming

200 M e V

of energy is released per fission of

_{92} U^{235}

, calculate the energy released when

1 k g

_{92} U^{235}

undergoes complete fission. What percentage of mass of

_{92} U^{235}

gets converted into energy ?

Q. Assertion :The bond energies of

C l_{2}

and

F_{2}

are 243 and

155 k J m o l^{- 1}

respectively. So,

X e F_{2}

is much more stable compound than

X e C l_{2}

. Reason:

Δ H

X e (g) ⟶ X e^{+} (g) + e^{-}; I

(ionisation energy)

X_{2} (g) ⟶ 2 X (g); D

(Bond energy)

2 X (g) + 2 e^{-} ⟶ 2 X^{-} (g); 2 E

(electron affinity)

X e^{+} (g) + 2 X^{-} (g) ⟶ X e X_{2} (g); - U

(lattice energy).
......................................................................

X e (g) + X_{2} (g) + X e X_{2} (g); Δ H_{f} = I + D + 2 F - U

......................................................................
By taking values of

I, D, E a n d U

, we find that

Δ H_{f}^{\circ} (X e F_{2})

is more negative than that of

X e C l_{2}

. Thus

X e F_{2}

is much more stable.

Q. Assertion :The activity of

1

g

pure uranium-

235

will be greater than the same amount present in

U_{3} O_{6}

. Reason: In the combined state, the activity of the radioactive element decreases.

Q. The energy released per fission reaction of

U^{235}

200 MeV

. Find the energy released by the fission of

1 g

U^{235}

(Avogadro number, N_{A} = 6.023 \times 10^{23})

Q. A nuclear power plant generates electric power of 200 MW using the nuclear fusion of U-235. How much uranium is consumed in a day to produce the electric power, if one U-235 nucleus produces 190 MeV of energy?

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1 g of U-235 is converted into UF6. The radioactivity of UF6 thus obtained is :

The correct option is D same as that of 1 g of U-235Radioactivity does not depend upon the state of combination so it remains unaffected.Therefore, it will be the same as that of 1 g of U-235.Hence, option D is correct.

1 g of U-235 is converted into ${U F}_{6}$ . The radioactivity of ${U F}_{6}$ thus obtained is :

The correct option is D same as that of 1 g of U-235
Radioactivity does not depend upon the state of combination so it remains unaffected.

Therefore, it will be the same as that of 1 g of U-235.

Hence, option D is correct.