An atom has mass number 39 and 20 neutrons. Its atomic number is:
A. 20
B. 39
C. 19
D. 59
Answer: Option C
Solution (By JKSSB Mock Tests)
Atomic number (Z) = Mass number (A) – Number of neutrons (N) = 39 – 20 = 19. This is potassium (K). Number of protons equals atomic number. In a neutral atom, electrons also equal Z.
Explanation:
The Solvay process (or ammonia-soda process) is the major industrial process for the production of sodium carbonate (soda ash, Na2CO3). It uses brine (NaCl) and limestone (CaCO3) as raw materials, with ammonia acting as an intermediate that is recovered and recycled.
Explanation:
Sulphuric acid (H₂SO₄) was historically called oil of vitriol. Hydrochloric acid was muriatic acid, nitric acid was aqua fortis, carbolic acid is phenol.
Explanation:
Ethanol, commonly known as ethyl alcohol, has the chemical formula C₂H₅OH. Methanol is CH₃OH. Acetic acid (ethanoic acid) is CH₃COOH, and propionic acid is C₂H₅COOH. Ethanol is widely used as a solvent, in alcoholic beverages, and as a biofuel.
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