Which of the following is less general in characters as compared to genus?

$A$ metal which does not react with nitrogen is

Two fair dice are rolled. The probability of the sum of digits on their faces being greater than or equal to $10$ is

An aluminium ring $B$ faces an electromagnet $A$. The current $I$ through $A$ can be altered. Which of the following statements is correct?

When a sound wave of wavelength $\lambda$ is propagating in a medium,the maximum velocity of the particle is equal to the wave velocity. The amplitude of the wave is:

The locus of the centre of the circle,which cuts the circle $x^2+y^2-20x+4=0$ orthogonally and touches the line $x=2$,is