Chemistry Past Questions and Answers

The densities of two gases, X and Y, are 0.5 g dm<sup style='font-size: smaller;'>-3</sup> and 2.0 dm<sup style='font-size: smaller;'>-3</sup> respectively.<br/>What is the rate of diffusion of X relative to Y?

The shape of ammonia molecule is?

An increase in temperature causes an increase in the pressure of a gas because?

The number of electrons in the valence shell of an element of atomic number 14 is?

Which of the following physical properties decreases down a group in the periodic table?