Question

The gamma ray emission from the decay of cobalt-60 is usedin cancer therapies, cobalt-60 decays by the emission of two gamma rays followed by beta emission. What is the final product of_27^60 Co_29^58 cu_26^58 fe_28^60 Ni_26^59 Fe A sodium nucleus,_11^23 Na is bombarded with alpha panicles to form a radioactive nuclide. This product nuclide can decay by several routes. Which of the following sets of products does not represent a potential route of decay of the product nuclide?_10^21 Ne +_1^2 h_12^26 Mg +_1^1 H_11623 Na +_2^4 he_13^27 Al +_0^0 gamma_13^26 Al +_061 n A radioactive isotope decays by a emission followed by two beta emissions. What is the change in the mass number and atomic number of the original isotope? The mass number decreases by 4 and the atomic number is unchanged. The mass number increases by 4 and the atomic number increases by 2. The mass number increases by 4 and the atomic number increases by 4. The mass number decreases by 2 and the atomic number decrease by 2. none of the above In the radioactive decay series of plutonium-244 to form lead-208, how many alpha particles and how many beta particles are emitted per plutonium atom? 6 alpha particles and 6 beta particles 3 alpha panicles and 3 beta particles 9 alpha particles and 6 beta particles 12 alpha particles and 8 beta particles 18 alpha particles and 9 beta particles Which of the following salts has the highest molar solubility in water? SrCO_3(K_sp = 9.3 Times 10^-10) BaSO_4(K_sp = 1.1 Times 10^-10) AgCl(K_sp = 1.8 Times 10^-10)

Answer 1

5) Yamma decay causes do not change in atomic number (or) mass number.

beta causes increase in atomic number by 1.

There, final product of the decay = ⁶⁰Ni₂₈

Ans = D

6) A

²³Na₁₁ + ⁴He₂ ---------> ²⁷Al₁₃

A donot give ²⁷Al_13.

B-E gives ²⁷Al_13.

7) A

alpha emission causes decrease in mass number by 4 and decrease in atomic number by 2

beta emission causes no chnage in mass number and increase in atomic number by 2

Therefore,

alpha + two beta emission causes decrease in mass number by 4 and  no chnage in atomic number

9) A

Larger the Ksp , more is the molar solubility in water.

Since SrCO3 has higher Ksp, it has more molar solubility in water.