alleryStart learning →Gain of oxygen (or loss of electrons) by a substance is called:
- reduction
- neutralisation
- condensation
- oxidation
Show answer and solution
Correct answer: D. oxidation
Oxidation = gain of oxygen or loss of electrons.
Indian Navy SSR (Sailor) Chemical Reactions and Equations — practice questions
Explore 2 free Chemical Reactions and Equations questions in Indian Navy SSR (Sailor) Science. Open each question or exercise to read its content, reference answers and available explanation.
Practise Chemical Reactions and Equations with Quill →Chemical Reactions and Equations questions and exercises with answers
Showing questions 1–2 of 2.
Worked practice questions
Which reaction does NOT need heat to proceed?
- 2 H₂O → 2 H₂ + O₂
- 2 AgCl → 2 Ag + Cl₂
- CaO + H₂O → Ca(OH)₂
- CaCO₃ → CaO + CO₂
Show answer and solution
Correct answer: C. CaO + H₂O → Ca(OH)₂
Slaking of lime is a vigorous combination that releases heat rather than needing it.
The other three are decompositions that require heat, electricity, or sunlight.
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