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 10+2 B.Tech Cadet Chemical Reactions and Equations — practice questions
Explore 4 free Chemical Reactions and Equations questions in Indian Navy 10+2 B.Tech Cadet 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 1–4 of 4.
Gain of oxygen (or loss of electrons) by a substance is called:Read the answer and worked solution →The decomposition of a substance on heating is called ___ decomposition:Read the answer and worked solution →Which reaction does NOT need heat to proceed?Read the answer and worked solution →Silver objects turn black on long exposure to air mainly because:Read the answer and worked solution →
Worked practice questions
The decomposition of a substance on heating is called ___ decomposition:
- electrolytic
- catalytic
- thermal
- photochemical
Show answer and solution
Correct answer: C. thermal
Decomposition caused by heating is thermal decomposition.
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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