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a
A – q; B-p ; C-s ; D-r
b
A –r; B-q ; C-r ; D-p,q
c
A – s; B-p ; C-q ; D-r
d
A –r; B-s ; C-q ; D-p
answer is A.
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Detailed Solution
i) Phosgene COCl2 ,it is a colourless poisonous gas ii) Water glass is called as sodium silicate or soluble gasiii) CO is a ligand, in metal carbonyliv) Solid CO2 (Dry Ice) is used as fire extinguisher