Chapter 9: Problem 3
State whether the following statements are true or false. A fire extinguisher contains sodium bicarbonate and acid.
Chapter 9: Problem 3
State whether the following statements are true or false. A fire extinguisher contains sodium bicarbonate and acid.
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Get started for freeWhich property is imparted to glass by the addition of cerium oxide? (a) colour (b) resistance to breakage (c) increase of refractive index (d) protection from UV light
Which of the following reactions is called slaking of lime? (a) \(\mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}\) (b) \(\mathrm{CaO}+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CaO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\) heat (d) \(\mathrm{CaCO}_{3}+\mathrm{NaCl} \rightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{CaCl}_{2}\)
Identify which contributes for strengthening of lime mortar structures and contributes for weaken- ing of RCC structures. (a) usage of water containing dissolved salts (b) addition of lime (c) absorption of \(\mathrm{CO}_{2}\) from atmospheric air (d) both \((2)\) and \((3)\)
State whether the following statements are true or false. Setting of mortar is the result of reaction between slaked lime and \(\mathrm{CO}_{2}\) of air.
The glass containing litharge as an ingredient makes the optical fibres glow because it (a) increases the refractive index (b) has low density (c) is highly thermally resistant (d) scatters all the radiations incident on it
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