Dilute sulphuric acid was added to compound 'P' of magnesium. The solid reacted with acid to form a colourless solution Q and a colourless gas R which formed a white
precipitate when bubbled through lime water.
a)
Name:
i) compound P
(lmk)
ii) solution Q
..(Imk)
colourless gas R
.(lmk)
b) Write a word equation for the reaction that took place
(Imk)
c)
Comment on the observation that would be made if a similar compound of
calcium was used in place of that of magnesium
(3mks)​

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

4d^55s^1 ( third choice)