Question
In which among the following pair both the elements are metalloids?
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$C + {O_2} \to C{O_2};\,\Delta H = - 394\,kJ\,mo{l^{ - 1}}$
$2CO + {O_2} \to 2C{O_2};\,\Delta H = - 569\,kJ\,mo{l^{ - 1}}$ The heat of formation of $1\,mol$ of carbon monoxide is thus .....$kJ\,mo{l^{ - 1}}$
The order of decreasing reactivities of these alcohols towards substitution with $HBr$ is
|
LIST $I$ (Compound) |
LIST $II$ (Uses) |
| $A$ Iodoform | $I$ Fire extinguisher |
| $B$ Carbon tetrachloride | $II$ Insecticide |
| $C$ $CFC$ | $III$ Antiseptic |
| $D$ $DDT$ | $IV$ Refrigerants |
Choose the correct answer from the options given below :