Which of the following complexes is not a chelate?

The accessory glands of the human male reproductive system are:

In compound $X$,all the bond angles are exactly ${109^o}28'$,$X$ is

Two particles $A$ and $B$ of equal masses are suspended from two massless springs of spring constants $k_1$ and $k_2,$ respectively. If the maximum velocities during oscillations are equal,the ratio of amplitudes of $A$ and $B$ is

In the following reaction $A \rightarrow B + C$,the rate constant is $0.001 \ M \cdot s^{-1}$. If we start with $1 \ M$ of $A$,then the concentrations of $A$ and $B$ after $10 \ minutes$ are respectively:

$A$ coil of wire of radius $r$ has $600$ turns and a self-inductance of $108 \ mH$. The self-inductance of a coil with the same radius and $500$ turns is (in $mH$)