The sum of the spin only magnetic moment values $(in \ B.M.)$ of $\left[ Mn ( Br )_6\right]^{3-}$ and $\left[ Mn ( CN )_6\right]^{3-}$ is $....$ .

What is the approximate height reached by the Eucalyptus tree?

Two cells $A$ and $B$ are connected in the secondary circuit of a potentiometer one at a time,and the balancing lengths are $400 \ cm$ and $440 \ cm$ respectively. The emf of cell $A$ is $1.08 \ V$. The emf of the second cell $B$ in volts is:

The variance of $20$ observations is $5$. If each observation is multiplied by $2$,then the variance of the resulting observations is:

Which of the following is responsible for the production of biogas?

The pole of the straight line $x+4y=4$ with respect to the ellipse $x^2+4y^2=4$ is