Question

Which among the following statements is false regarding glass?

• A. It absorbs ultra-violet light
• B. It consists of silicates of sodium and alkali
• C. $HF$ causes marking on glass
• D. All the halogen acids $(HF,HCl,HBr$ and $HI)$ are stored in glass bottles

Answer 1

Answer: (D)

All the halogen acids $(HF,HCl,HBr$ and $HI)$ are stored in glass bottles

(A) The glass is opaque due to scattering of light by small crystals therein. However, it absorbs ultra-violet light.
Thus, the option $A$ is correct.
(B) It consists of silicates of sodium and alkali.
The ordinary glass may be represented as $N{a}_{2}O.CaO.6Si{O}_2$.
Thus, the option $B$ is correct.
(C) $HF$ causes marking on glass as glass dissolves in HF with the liberation of silicon tetrafluoride gas.
Thus, the option $C$ is correct.
(D) Except, $HF$ all the halogen acids ($HCl,HBr$ and $HI$) are stored in glass bottles.
Hence, the option $D$ is incorrect.