Question

The most of the radiations coming out from pitch blend were?​

Answer 1

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A

The most radioactive element present in pitchblende is uranium

B

P−32 is used for the treatment of leukaemia

C

CO2 present in the air contains C−12 only

D

Emission of γ- rays changes the mass number but not atomic number

Answer

A::C::D

Solution

(a) Is not true because most radioactive element present in pitchblende is Radium.

(c) Is not true because CO2 in the air contains C−12 as well as C−14

(d) Is not true because emission of γ− rays, neither changes mass number nor atomic number

Answer 2

Answer:

The most of the radiations coming out from pitch blend were Uranium.

Explanation:

• pitchblende has an amorphous, black, pitchy form .
• Pitch blend also known by the name uraninite, is a mineral comprised mainly of oxides of the element uranium, Uranium dioxide, and Uranium trioxide. It is the primary ore of uranium.
• mining of pitchblende is mainly for extraction of uranium for use in nuclear weapons and for nuclear fuel to be used in the atomic energy industry.
• The pitchblende rocks are processed into a radioactive concentration known as yellowcake.
• It takes tons of pitchblende ores in order to produce this yellowcake.
• Uranium, polonium and Radium were found in pitch blend.
• The uranium had been extracted by dissolution in sulfuric acid leaving radium sulfate, which is similar to barium sulfate but even less soluble in the residues.
• Pitch blend has no thorium in it.

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