What is the maximum number of rectangular components into which a vector can be split in space?

Bond dissociation energies of $HF$,$HCl$,and $HBr$ follow the order:

Thermodynamically the most stable form of carbon is

If the coefficients of the $(2r+1)$-th term and the $(r+2)$-th term in the expansion of $(1+x)^{43}$ are equal,then $r$ is equal to:

If the amplitude of $z-2-3i$ is $\frac{\pi}{4}$,then the locus of $z=x+iy$ is:

$A$ variable plane is at a constant distance $h$ from the origin and meets the coordinate axes in $A, B, C$. The locus of the centroid of $\triangle ABC$ is