Beta particles are emitted from the nucleus. They are: MCQ with Answer and Explanation

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Beta particles are emitted from the nucleus. They are:

A. Fast electrons

B. Neutrons

C. Helium nuclei

D. Protons

Answer: Option A

Solution (By JKSSB Mock Tests)

Beta (β⁻) particles are high-energy electrons emitted when a neutron converts to a proton. Positrons (β⁺) are also beta particles.

This question belongs to: Science chemistry

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Practice More chemistry Questions

Question #1

Hard water contains dissolved salts of calcium and magnesium. Which substance causes temporary hardness?

A. Calcium bicarbonate

B. Sodium bicarbonate

C. Magnesium chloride

D. Calcium sulfate

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Correct Answer: Option A

Explanation:
Temporary hardness is due to dissolved bicarbonates of Ca and Mg, which can be removed by boiling: Ca(HCO₃)₂ → CaCO₃↓ + H₂O + CO₂. Permanent hardness is caused by chlorides and sulfates of Ca and Mg, not removed by boiling. Sodium bicarbonate does not cause hardness. Methods to remove permanent hardness include treatment with washing soda (Na₂CO₃), ion exchange, or calgon.

This question belongs to: Science chemistry

Question #2

Pepsin is an enzyme that digests:

A. Cellulose

B. Starch

C. Fats

D. Proteins

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Correct Answer: Option D

Explanation:
Pepsin, secreted in the stomach, breaks down proteins into peptides. It works in acidic pH. Amylase digests starch; lipase digests fats.

This question belongs to: Science chemistry

Question #3

Which of the following is an example of catalytic poisoning?

A. Arsenic ruining the activity of finely divided iron in Haber's process.

B. Platinum increasing the rate of combustion of hydrogen.

C. Addition of molybdenum to iron in Haber's process.

D. Addition of phosphoric acid to slow down H2O2 decomposition.

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Correct Answer: Option A

Explanation:
Catalytic poisoning occurs when a substance (a catalytic poison) binds strongly to the active sites of a catalyst, blocking reactants from adsorbing and thereby destroying or reducing its catalytic activity. Arsenic acts as a poison for the iron catalyst used in the Haber process for ammonia synthesis.

This question belongs to: Science chemistry

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