MCQ
When a corroded metal object is rubbed by a sand paper then:
- AOuter metal surface is removed.
- BMetal becomes thin.
- ✓Outer corroded layer will be removed.
- DAll of the above.
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(Given: specific rotations of ($+$)-sucrose, ($+$)-maltose, $L$-($-$)-glucose anc. $+(+)$-fructose in aqueous solution are $+66^{\circ},+140^{\circ},-52^{\circ}$ and $+92^{\circ}$, respectively)
($A$) 'invert sugar' is prepared by acid catalyzed hydrolysis of maltose
($B$) . 'invert sugar' is an equimolar mixture of $D$-($+$)-glucose and $D$-($-$)-fructose
($C$) specific rotation of 'invert sugar' is $-20^{\circ}$
($D$) on reaction with $\mathrm{Br}_2$ water, 'invert sugar' forms saccharic acid as one of the products
$A \rightarrow B; \ \ \ K_1 = 10^{15}\ exp.\ \left( {\frac{{ - 2000}}{T}} \right)$
$C \rightarrow D;\ \ \ K_2 = 10^{14}\ exp. \ \left( {\frac{{ - 1000}}{T}} \right)$
The temperature at which $K_1 = K_2$ is ........... $K$ ($exp. = e$)