Nuclear Fusion

Q. Define isodiapheres and give 2 examples?

Q. s†an dard free energies of formation at 298k are -237.2, -394.4 , & -8.2 for h2o, co2 , & pen†an e. value of E cell for pen†an e oxygen fuel cell i

Q. An atom of radium combines with two atoms of chlorine to form $RaC{l}_2$ molecule. The radioactivity of $RaC{l}_2$ will be :

1. zero
2. as much as that of the same quantity of Ra
3. one-half of the same quantity of Ra
4. one-third of the same quantity of Ra

Q. Assertion :Energy of electron in Bohr's orbit is always negative. Reason: Energy of electron is sum of potential energy and kinetic energy.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. What is use of helium in nuclear reactors?

Q. The binding energy of deuteron is $2.2MeV$ and that of ${}_2^4\text{HE}$ is 28 MeV. If two deuterons are fused to form one ${}_2^4\text{HE}$ then the energy released is:

1. $25.8MeV$
2. $23.6MeV$
3. $19.2MeV$
4. $30.2MeV$

Q. Define the following terms.
(a) Enthalpy of fusion.
(b) Enthalpy of atomization.

Q. Which is the most dangerous explosion?

1. Volcanic explosion
2. Dynamite explosion
3. Nuclear explosion
4. Gun powder explosion

Q. As an electron is brought from an infinite distance close of nucleus of the atom, the energy of electron:

1. increases to a greater $+ve$ value
2. decreases to a smaller $+ve$ value
3. decreases to a smaller $-ve$ value
4. increases to a greater $-ve$ value

Q. The number of α (alpha) and β (beta) particles emitted with 1 Pb atom in the following reaction are

₉₀Th²³² → ₈₂Pb²⁰⁸

निम्नलिखित अभिक्रिया में 1 Pb परमाणु के साथ उत्सर्जित α (एल्फा) तथा β (बीटा) कणों की संख्या है

₉₀Th²³² → ₈₂Pb²⁰⁸

1. 6 alpha and 4 beta
   
   6 एल्फा तथा 4 बीटा
2. 4 alpha and 6 beta
   
   4 एल्फा तथा 6 बीटा
3. 8 alpha and 6 beta
   
   8 एल्फा तथा 6 बीटा
4. 8 alpha and 4 beta
   
   8 एल्फा तथा 4 बीटा

Q. Complete and balance the following reaction:

1. $6{Ag}^{+}+As{H}_3+3H_{2}O\to 6Ag\downarrow +6H^{+}+H_{3}As{O}_3$
2. $6{Ag}^{+}+2As{H}_3+3H_{2}O\to 6Ag\downarrow +6H^{+}+H_{3}A{s}_2{O}_3$
3. None of these
4. $6{Ag}^{+}+2As{H}_3+5H_{2}O\to 6Ag\downarrow +10H^{+}+H_{3}A{s}_2{O}_3$

Q. ${}_{96}^{246}Cm{+}_6^{12}C⟶?+4_0^{1}n$

1. ${}_{102}^{254}No$
2. ${}_{101}^{252}No$
3. ${}_{102}^{253}No$
4. None of these

Q. On moving top to down in a group. the atomic density:

1. Decreases
2. Remains the same
3. Can't be said
4. Generally increases

Q. Alpha emission of ${}^{162}Re$

1. ${}_{75}^{162}Re{⟶}_{73}^{158}Ta{+}_2^{4}He$
2. ${}_{74}^{162}Re{⟶}_{72}^{158}Ta{+}_2^{4}He$
3. None of these
4. ${}_{76}^{162}Re{⟶}_{73}^{158}Ta{+}_3^{4}He$

Q. Calculate the Q-value of the fusion reaction ${}^{4}He{+}^{4}He{=}^{8}Be$ Is such a fusion energetically favorable? Atomic mass of
${}^{8}Beis8.0053uandthato{f}^{4}He$ is 4.0026 u.

1. The Q value is negative and the reaction is energetically favorable
2. The Q value is positive and the reaction is energetically favorable
3. The Q value is negative and the reaction is not energetically favorable
4. The Q value is positive but the reaction is not energetically favorable

Q. How is the nuclear equation balanced?

Q. A heavy nucleus X of mass number 240 & binding energy per nucleon 7.6 MeVis split into two fragments Y & Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.5 MeV per nucleon. Calculate the energy Q released per fission in MeV ?