Electro Chemistry — Important Questions
Telangana Open School (TOSS) · Class 12 · Chemistry
45 important questions from Electro Chemistry for Telangana Open School (TOSS) Class 12 Chemistry, with answers. Written for the board exams 2027.
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Important Questions from Electro Chemistry
What is the oxidation number of hydrogen in CaH₂?
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-1
When hydrogen is bonded to metals, as in hydrides like CaH₂, its oxidation number is -1.
Which of the following is a strong electrolyte?
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NaCl
NaCl completely dissociates into ions in solution, making it a strong electrolyte.
What is the unit of conductivity (k)?
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S cm⁻¹
Conductivity (k) is measured in siemens per centimeter (S cm⁻¹).
What is the oxidation number of nitrogen in NO₃⁻?
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+5
Let oxidation number of N be x. Then: x + 3(-2) = -1 → x - 6 = -1 → x = +5.
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