Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?
Correct answer: C. ZnO
- A. CaO
- B. MnO2
- C. ZnO
- D. FeS
Explanation
ZnO modifies the glass network and lowers its coefficient of thermal expansion, improving resistance to thermal shock. MnO2 is mainly associated with decolorising or colouring effects, not this principal role.
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