Isotopes of chlorine are ³⁵Cl and ³⁷Cl. Their atomic numbers are:
A. 35 and 37
B. 17 and 17
C. 35 and 17
D. 17 and 20
Answer: Option B
Solution (By JKExamLibrary)
Atomic number is the number of protons, which is 17 for all chlorine atoms. Mass numbers differ due to different neutrons (18 and 20). Isotopes have same atomic number, different mass number.
Explanation:
NaCl is the product of neutralization of HCl (strong acid) and NaOH (strong base). Neither ion hydrolyses appreciably, so the solution remains neutral (pH=7). Salts of strong acid + weak base are acidic (NH₄Cl), weak acid + strong base are basic (CH₃COONa).
Explanation:
Bauxite (Al₂O₃·2H₂O) is the principal ore of aluminium. Haematite is Fe₂O₃, galena is PbS, cinnabar is HgS. Bauxite is refined by Bayer's process to produce alumina, then electrolytically reduced (Hall-Héroult process).
Explanation:
Electronegativity is the tendency of an atom to attract shared electrons in a chemical bond. It increases across a period and decreases down a group. Fluorine, located at the top right of the periodic table (Group 17, Period 2), has the smallest atomic radius and highest effective nuclear charge, giving it the highest electronegativity (3.98 on Pauling scale).
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