Which of the following crops contain recalcitrant seeds?

The $INCORRECT$ statement about the dissolution of an alkali metal in liquid ammonia is

The electrostatic potential inside a charged spherical ball is given by $\phi = ar^2 + b$,where $r$ is the distance from the centre and $a, b$ are constants. Then the charge density inside the ball is

The malignant tertian malaria is caused by

Which one of the following is not an iso-electronic pair?

When a body of mass $1.0\, kg$ is suspended from a certain light spring hanging vertically,its length increases by $5\, cm$. By suspending a $2.0\, kg$ block to the spring,if the block is pulled through $10\, cm$ and released,the maximum velocity in $m/s$ is: (Acceleration due to gravity $g = 10\, m/s^2$)