Alpha rays consist of: MCQ with Answer and Explanation

Alpha rays consist of:
A. Neutrons
B. Helium nuclei
C. Electrons
D. Protons
Answer: Option B
Solution (By JKExamLibrary)
Alpha particles are identical to helium-4 nuclei (2 protons + 2 neutrons), with a +2 charge. They are emitted during radioactive decay of heavy elements like uranium. They have low penetration power. Beta rays are electrons, gamma rays are photons.

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Practice More chemistry Questions

Question #1
The catalyst used in the Ostwald process for nitric acid manufacture is:
A. Vanadium pentoxide
B. Iron
C. Nickel
D. Platinum-Rhodium gauze

Correct Answer: Option D


Explanation:
Ostwald process: NH₃ oxidized to NO over Pt-Rh catalyst at 800°C. Fe for Haber; Ni for hydrogenation; V₂O₅ for SO₂ oxidation.

This question belongs to: Science chemistry
Question #2
Carbon forms a large number of compounds due to its unique property of:
A. High electronegativity
B. Electrovalency
C. Catenation and tetravalency
D. Forming ionic bonds

Correct Answer: Option C


Explanation:
Carbon's ability to form bonds with other carbon atoms (catenation) and its tetravalency (four valence electrons) allow it to form long chains, branches, and rings, leading to millions of organic compounds. The C-C bond is strong (bond energy ~348 kJ/mol). Silicon also shows catenation but to much lesser extent. Carbon also forms multiple bonds, enhancing diversity.

This question belongs to: Science chemistry
Question #3
Which enzyme converts glucose into ethanol?
A. Maltase
B. Zymase
C. Urease
D. Invertase

Correct Answer: Option B


Explanation:
Zymase, a complex of enzymes from yeast, catalyzes fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Invertase hydrolyzes sucrose; urease hydrolyzes urea; maltase converts maltose to glucose.

This question belongs to: Science chemistry