An unknown gas x is said to be colourless, odourless, soluble in water and has a sharp refreshing taste
I. what is the name of the gas x
II. if the gas x is bubbled through lime water what observation can be seen
III. on continuous bubbling of the gas x through lime water the colour of solution disappears leaving a clear solution, give one chemical reason for the colour disappearance. and
IV. write a balanced chemical equation for gas x and lime water [(cacoh)2].

I. CO2

II. the lime water turns milky

III. an insoluble solution was formed; precipitation

IV. CO2+Ca(OH)2> CaCO3 + H2O

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms