Chemistry Past Questions and Answers

2H_2(g) + O_2(g) → 2H₂ O_(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube?

l . Evaporation. ll. Sublimation. lll. Diffusion. IV. Brownian motion.
Which of the above can correctly be listed as evidences for the particulate nature of matter?

If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?

A hydrogen atom which has lost an electron contains

The electronic configuration of Mg ²⁺ is