MCQ
In laboratory silicon can be prepared by the reaction
- ✓Silica with magnesium
- BBy heating carbon in electric furnace
- CBy heating potassium fluosilicate with potassium
- DNone of these
✓
Answer
Correct option: A.
Silica with magnesium
a
(a) $Si{O_2} + 2Mg \to Si + 2MgO$.
(a) $Si{O_2} + 2Mg \to Si + 2MgO$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Product is
Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are
At $25\,^oC$, calculate equilibrium constant for the cell reaction,
→${X_{\left( s \right)}} + Y_{\left( {aq} \right)}^{ + 2} \rightleftharpoons {Y_{\left( s \right)}} + X_{\left( {aq} \right)}^{2 + }$
Given :
$E_{{x^{ + 2}}/x}^o = - 1.36\,volt$ ;
$E_{{y^{ + 2}}/y}^o = - 0.76\,volt\,\frac{{2.303\,RT}}{F} = 0.06$
Among the following compounds ${C_3}{H_7}N{H_2},$ $N{H_3},C{H_3}N{H_2},$${C_2}{H_5}N{H_2}$ and ${C_6}{H_5}N{H_2},$ the least basic compound is
→According to the molecular orbital theory, the bond order in ${C_2}$ molecule is
→Which is set of paramagnetic molecules or ions
Solubility of a salt ${M_2}{X_3}$ is $y\,\,mol\,d{m^{ - 3}}.$ The solubility product of the salt will be
→Assertion : The ease of dehydration of the following alcohols is
Reason : Alcohols leading to conjugated alkenes are dehydrated to a greater extent
Assuming that $\mathrm{Ba}(\mathrm{OH})_{2}$ is completely ionised in aqueous solution under the given conditions the concentration of $\mathrm{H}_{3} \mathrm{O}^{+}$ions in $0.005 \,\mathrm{M}$ aqueous solution of $\mathrm{Ba}(\mathrm{OH})_{2}$ at $298\, \mathrm{~K}$ is $.....\times 10^{-12}$ $mol$ $\mathrm{L}^{-1}$. (Nearest integer)
→Which of the following pairs represent linkage isomers?