HF has highest boiling point among hydrogen halides, because it has :

Which of the following compounds is a constituent of the polymer

The layer of atmosphere between 10 km to 50 km above the sea level is called as :

If the tangent to the parabola y² = x at a point ($$\alpha $$, $$\beta $$), ($$\beta $$ > 0) is also a tangent to the ellipse, x² + 2y² = 1, then $$\alpha $$ is equal to :