In H₂ + Cl₂ → 2HCl initiated by light, what provides energy to initiate bond breaking?
- Sunlight
- The products only
- A zero-energy collision
- Cooling the vessel
Answer / جواب
Sunlight
Class 9 Chemistry Chapter 5 MCQs — Energetics
Class 9 Chemistry · Chapter 5 · Retained syllabus for Annual 2027
Practise this chapter online, check each answer and review your result. The current bank contains 5 objective questions for this chapter and medium.
Sample practice questions
Which listed process has a very low activation barrier in aqueous solution?
- NaCl + AgNO₃ → AgCl + NaNO₃
- Carbon combustion
- Hydrogen combustion
- H₂ + I₂ → 2HI
Answer / جواب
NaCl + AgNO₃ → AgCl + NaNO₃
Formation of which hydrogen halide from its elements is endothermic?
- HI
- HCl
- HF
- HBr
Answer / جواب
HI
Which reaction profile makes reverse reaction comparatively accessible?
- A profile with comparable forward and reverse activation barriers
- A profile with an enormous reverse barrier
- A profile showing no products
- A profile with zero reactants
Answer / جواب
A profile with comparable forward and reverse activation barriers
Printable practice
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