MCQ
Zone refining method is used for the ores of:
- ASilicon.
- BBoron.
- CGallium.
- ✓All of these.
✓
Answer
Correct option: D.
All of these.
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
Which of the following compounds will not undergo Cannizaro reaction, when treated. with $50\%$ aqueous alkali?
→The formula of an oxyacid of phosphorus is ${H_3}P{O_4}$. It is a
→$C _{6} H _{6}$ freezes at $5.5^{\circ} C$. The temperature at which a solution $10\, g$ of $C _{4} H _{10}$ in $200\, g$ of $C _{6} H _{6}$ freeze is ...... ${ }^{\circ} C$. (The molal freezing point depression constant of $C _{6} H _{6}$ is $5.12\,{ }^{\circ} C / m .$ )
→Which of the following molecule has maximum number of lone pair ?
The major aromatic product $C$ in the following reaction sequence will be :
→Given below are two statements $:$ one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
→Assertion $(A) :$ $I - Cl$ is more reactive than $I _{2}$.
Reason $(R):$ $I - Cl$ bond is weaker than $I-I$ bond.
In the light of the above statements, choose the most appropriate answer from the options given below:
A compound of molecular formula $C_8H_8O_2$ reacts with acetophenone to form a single cross-aldol product in the presence of base. The same compound on reaction with conc. $NaOH$ forms benzyl alcohol as one of the products. The structure of the compound is
→On the basis of the information available from the reaction $\frac{4}{3}Al + {O_2} \to \frac{2}{3}A{l_2}{O_3},\Delta G = - 827\,\,kJ\,mo{l^{ - 1}}$ of ${O_2}$, the minimum emf required to carry out an electrolysis of $A{l_2}{O_3}$ is $(F = 96500\,C \,mo{l^{ - 1}})$ ................ $\mathrm{V}$
→Methyl-terbutyl ether on heating with $HI$ of one molar concentration gives
→The cell potential of a cell in operation is