Boron halides behave as Lewis acids because of their nature.

The substance used in the thermite process of reducing metal ores is

Which of the following represents the correct pathway of blood circulation in the human heart?

In $YDSE$,the separation between the slits is halved and the distance between the slit and the screen is doubled. The fringe width is

$A$ closely wound coil of $100$ turns and area of cross-section $1 \; cm^2$ has a coefficient of self-induction $1 \; mH$. The magnetic induction in the centre of the core of the coil when a current of $2 \; A$ flows in it will be (in $Wb/m^2$):

Two cylinders $A$ and $B$ fitted with pistons contain equal number of moles of an ideal monoatomic gas at $400 ~K$. The piston of $A$ is free to move while that of $B$ is held fixed. Same amount of heat energy is given to the gas in each cylinder. If the rise in temperature of the gas in $A$ is $42 ~K$,the rise in temperature of the gas in $B$ is (in $~K$)