MCQ
Silicon dissolves in excess of $HF$ due to formation of
- A$SiF_4$
- B$SiH_4$
- ✓$H_2SiF_6$
- D$H_2SiF_4$
✓
Answer
Correct option: C.
$H_2SiF_6$
c
HF is a very strong acid and can also react with silicon and corrode its lattice
HF is a very strong acid and can also react with silicon and corrode its lattice
$\mathrm{Si}+4 \mathrm{HF} \rightarrow \mathrm{SiF}_{4}+4 \mathrm{H}^{+}$
$\begin{array}{l}\downarrow \mathrm{HF} \\\mathrm{H}_{2} \mathrm{SiF}_{6}\end{array}$
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
In the reaction given below, the product would be
→$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{C{H_3}{\text{ }} - {\text{ }}CH{\text{ }} = {\text{ }}CH{\text{ }} - {\text{ }}C{H_3}\xrightarrow{{{H_3}{O^ + }}}\,C{H_3} - C{H_2} - CH - C{H_3}}
\end{array}$
In the reaction
→Propene $\xrightarrow{{C{l_2}/500\,{}^oC}}A\xrightarrow[{{\text{dryether}}}]{{Na}}B$
$B$ is
What metals combine with non-metals, the metal atom tends to
The simplest formula of a compound containing $50\%$ of element $X$ (atomic mass $10$) and $50\%$ of element $Y$ (atomic mass $20$) is
→In the P3-, S2- and Cl- ions, the increasing order of size is:
$1.4\, moles$ of phosphorus trichloride are present in a sample. How many atoms are there in the sample?
→Under a given set of experimental conditions, with increase in the concentration of the reactants, the rate of a chemical reaction
Which of the following molecules, in pure form, is (are) unstable at room temperature?
Match the Column $I$ with Column $II$ and select correct answer by given codes.
→|
Column $I$ |
Column $II$ |
| $A$. Inert-gas elements | $1.\left( {n - 1} \right){d^{1 - 10}}\,n{s^{1 - 2}}$ |
| $B$. Transition elements | $2\,. ns^2\,np^6$ |
| $C$. Inner-transition elements | $3.\left( {n - 2} \right){f^{1 - 14}}\,\left( {n - 1} \right){s^2}{p^6}{d^{0 - 1}}\,n{s^2}$ |
The correct order of dipole moment is