Match the species in List-I with their geometry in List-II. List-I: A. $PCl_{5}$ B. $BrF_{5}$ C. $BF_{4}^{-}$ D. $[Ni(CN)_{4}]^{2-}$ List-II: I. Tetrahedral II. Square Planar III. Trigonal bipyramidal IV. Square pyramidal Choose the correct answer from the options given below:

The number of action potentials generated by sino-atrial node (SAN) in a healthy human is per minute.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Forelimbs of human and bats are homologous. Reason R: Forelimbs of humans and bats have similar anatomical structure. In the light of the above statements, choose the most appropriate answer from the options given below.

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. $W_{1}$, $W_{2}$, $W_{3}$ and $W_{4}$ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; $\Delta U_{2}$ and $\Delta U_{4}$ are changes in the internal energy for the processes 2 and 4, respectively. [use $R=2~cal~K^{-1}~mol^{-1}$] The correct option is

Consider two circuits, (A) and (B), each having two resistors. One of them has a positive temperature coefficient of resistance, +$\alpha$, while the other one has a negative temperature of coefficient, -$\alpha$, as shown in the figure. The current through these circuits are denoted by $I_{A}$ and $I_{B}$. At initial temperature, the resistance of the two resistors is $R_0$. As the temperature is increased, the correct option that describes the variation of current in these circuits is: