Statement $I$: Boron does not exhibit allotropy.
Statement $II$: Boron is an extremely hard and black-coloured solid.
Statement $II$: Boron is an extremely hard and black-coloured solid.
- ABoth $I$ & $II$ are correct
- BBoth $I$ & $II$ are not correct
- C$I$ is correct but $II$ is not correct
- D$I$ is not correct but $II$ is correct
Explore More
Similar Questions
The stability of $+1$ oxidation state among $Al$,$Ga$,$In$ and $Tl$ increases in the sequence:
MediumAIPMT 2009
View SolutionAluminium reacts with $NaOH$ and forms compound '$X$'. If the coordination number of aluminium in '$X$' is $6$, the correct formula of $X$ is:
Aluminium $(III)$ chloride forms a dimer because ........
Medium
View SolutionMatch the List-$I$ with List-$II$.
List-$I$ (Element) List-$II$ (Application) $A$. $Cs$ $I$. High temperature thermometer $B$. $Ga$ $II$. Water repellent sprays $C$. $B$ $III$. Photoelectric cells $D$. $Si$ $IV$. Bullet proof vest
Choose the most appropriate answer from the options given below:
| List-$I$ (Element) | List-$II$ (Application) |
|---|---|
| $A$. $Cs$ | $I$. High temperature thermometer |
| $B$. $Ga$ | $II$. Water repellent sprays |
| $C$. $B$ | $III$. Photoelectric cells |
| $D$. $Si$ | $IV$. Bullet proof vest |
Choose the most appropriate answer from the options given below:
The correct formula of borax is $Na_2[B_4O_5(OH)_4] \cdot 8H_2O$. If the formula is represented as $Na_2[B_4O_5(OH)_x] \cdot yH_2O$, then the sum of $x$ and $y$ is:
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo