In a chloroplast,chlorophyll is found in:

Assertion $(A)$: $NaCl$ is less soluble in heavy water than in ordinary water.
Reason $(R)$: Dielectric constant of ordinary water is more than that of heavy water.
The correct answer is

The products formed when diethyl ether is reacted with cold $HI$ are

Vitamin $B_{12}$ contains which of the following metals?

The square root of $134 + \sqrt{6292}$ is:

If the equation $ax^2 + 2hxy + by^2 + 2gx + 2fy + c = 0$ represents a pair of straight lines,then the square of the distance of their point of intersection from the origin is