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Question 11 Mark
A radioactive nucleus undergoes a series of decays as per following scheme :
$A \xrightarrow{(\alpha)} A _1 \xrightarrow{(\beta)} A _2 \xrightarrow{(\beta)} A _3$.
The atomic number and mass number of Nuclei 'Á' are 92 and 238 respectively then what are these numbers for A3.
Answer
${ }_{92}^{238} A \xrightarrow[\left( He _2^4\right)]{\alpha}$${ }_{90}^{234} A_1 \xrightarrow{\beta}$${ }_{91}^{234} A_2 \xrightarrow{r}{ }_{91}^{234} A_3$
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Question 21 Mark
(a) Write the name and formulae for isotopes of hydrogen.
(b) What is represented by $ {}_{17}^{35}Cl $ and $ {}_{17}^{37}Cl $ ?
Answer
(a) Isotopes of Hydrogen : (i) Hydrogen $ ({}_{1}^{1}H) $, (ii) Deuterium $ ({}_{1}^{2}H) $, (iii) Tritium $ ({}_{1}^{3}H) $.
(b) $ {}_{17}^{35}Cl $ and $ {}_{17}^{37}Cl $ represent two isotopes of chlorine.
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Question 31 Mark
Write two important conclusions about nature of nuclear forces.
Answer
(i) These are attractive forces , (ii) These are short range non-electrical and non-gravitational forces.
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